Immatures of Gratiana conformis (Boheman) (Coleoptera, Chrysomelidae, Cassidinae)

Egg cases and larvae of Gratiana conformis (Boheman, 1854) were collected on Solanum paniculatum L. and reared in laboratory. Egg case, egg, third instar and mature larvae and pupa are described and illustrated. Biological notes and a comparison with the immatures of other Gratiana species and Charidotis gemellata Boheman, 1855, are also presented.

Morfologia comparada de três espécies de Stenocerus (Coleoptera, Anthribidae, Anthribinae)

Estudos detalhados da morfologia do exoesqueleto, peças bucais, venação alar, endosternitos, placas esclerotizadas do intestino posterior e genitálias do macho e da fêmea, foram utilizados para aprimorar a sistemática e evolução de antríbideos neotropicais. Nesta abordagem, S. fulvitarsis (espécie-tipo do gênero), S. longulus e S. frontalis foram minuciosamente comparadas, incluindo as redescrições e ilustrações de caracteres nunca antes estudados. Dentre as espécies analisadas, S. frontalis apresenta um distinto padrão mimético com dípteros da família Sarcophagidae. A hipótese desta espécie não pertencer ao gênero se comparada com a espécie-tipo e S. longulus é discutida com base principalmente na posição dos olhos, ausência de carenas laterais, metendosternito com lâminas laterais mais curtas que os braços e hastes medianas do ovipositor estreitas na porção proximal.

The elytro-tergal stridulatory apparatus of the genus Bondarius Rosado-Neto (Coleoptera, Curculionidae)

The elytro-tergal stridulatory organ that occurs in Bondarius Rosado-Neto, 2006 a genus of the tribe Sternechini (Curculionidae, Molytinae) is described and illustrated. The stridulatory apparatus is present both in male and female and is composed by the file, a narrow elevated carina which is transversely multistriate located at the apical third of the internal side near the suture of left elytron, and by the plectrum, a narrow striate area located transversely at the dorso-apical margin of the abdominal tergite 7.

Revision of the genus Harpasus Mulsant (Coleoptera, Coccinellidae, Chilocorini)

Harpasus Mulsant, 1850 was studied based on the morphology of the exoskeleton and genitalia. The type material of Harpasus aureus Almeida & Carvalho, 2006, H. quadrifolium González, Corrêa & Almeida, 2008 and a homotype of H. zonatus (Mulsant, 1850) were examined. The lectotype of H. eversmanni (Mulsant, 1850) was designated and two new species were described, Harpasus unifasciatus sp. nov. (Teresópolis, RJ, Brazil) and Harpasus ferrugineus sp. nov. (Puerto Carreño, Vichada, Colombia). Herein a diagnosis for the genus and its seven species, identification key and information about biological aspects are presented.

Contribuição para o conhecimento dos Parandrini da Costa Rica e do Panamá (Coleoptera, Cerambycidae, Parandrinae)

Somente quatro espécies de Parandrini eram conhecidas da Costa Rica e do Panamá: três em Parandra Latreille, 1802 (das quais só duas estavam registradas para o Panamá) e uma em Birandra Santos-Silva, 2002. Este trabalho registra Parandra (Parandra) solisi (Santos-Silva, 2007) pela primeira vez para o Panamá e acrescenta duas espécies novas: Parandra (Parandra) gilloglyi sp. nov., procedente do Panamá, e Birandra (Birandra) boucheri sp. nov., proveniente da Costa Rica e Panamá. São fornecidas chaves para as espécies de Parandra (Parandra) que ocorrem na Costa Rica e Panamá e para as espécies de Birandra (Birandra) conhecidas na América Central.

Lectotype designations for Ptychoderini species (Coleoptera, Anthribidae, Anthribinae) of the Muséum National d'Histoire Naturelle

Based on a study of the type material housed in the Muséum National d'Histoire Naturelle Paris, lectotypes are designated for the following species: 1) described by Jekel in 1855 - Ptychoderes columbianus, P. callosus, P. mixtus, P. antiquus, Hypselotropis batesi, Ectatotropis conicollis, and Tropipygus speciosus; 2) described by Thomson in 1858 - Phloeotragus sparsutus. The following species have the type specimens illustrated: Ptychoderes mixtus, lectotype female; P. tricostifrons, holotype male; Hypselotropis speciosa, lectotype male; Phloeotragus sparsutus, lectotype male and paralectotype female.

Aspectos biológicos de Leucothyreus dorsalis Blanchard (Coleoptera, Scarabaeidae, Rutelinae)

No Brasil existe uma escassez de informações sobre a bioecologia da maioria das espécies de Scarabaeidae. O objetivo do presente trabalho foi estudar os aspectos biológicos de Leucothyreus dorsalis Blanchard, 1850 em laboratório e a campo. A dinâmica populacional dos adultos foi avaliada de janeiro de 2006 a dezembro de 2007, com uso de armadilha luminosa. Adultos coletados em campo foram mantidos em recipientes de plástico contendo solo e mudas de Brachiaria decumbens Stapf, para obtenção de ovos e dar início aos estudos. Todos os estágios de desenvolvimento foram acompanhados e adultos e imaturos foram mensurados para obtenção de dados biométricos. Foram coletados 3.607 adultos e os picos populacionais de coleta ocorreram em novembro de 2006 e outubro de 2007, com média de 145 e 241 indivíduos coletados, respectivamente. O período embrionário durou em média 15,5 dias, o primeiro instar 32,4 dias, o segundo 38,9 dias, o terceiro 52,7 dias, a fase de pré-pupa 130,7 dias, a fase pupal 23,5 dias e a longevidade 18 dias. O ciclo biológico completou-se em 273,5 dias, o que caracteriza a espécie como univoltina. Verificou-se que do primeiro ao terceiro instar houve um aumento de 4,5 vezes no comprimento e de 3,5 vezes na largura das larvas. Observou-se um aumento de 53,1 vezes no peso larval do primeiro para o terceiro instar. As pupas das fêmeas foram significativamente maiores e mais pesadas que a dos machos. As fêmeas adultas foram maiores que os adultos machos, porém, apresentaram peso semelhante.

Novo registro e novas espécies de Cerambycinae (Coleoptera, Cerambycidae) de Trinidad and Tobago e da Venezuela

Novas espécies descritas de Trinidad and Tobago: Plocaederus dozieri sp. nov. (Cerambycini, Cerambycina), Anelaphus trinidadensis sp. nov. (Elaphidionini), Piezocera rufula sp. nov. (Piezocerini), Assycuera marcelae sp. nov. and Ceralocyna venusta sp. nov. (Trachyderini, Ancylocerina). Neocompsa pallida sp. nov. (Ibidionin) é descrita de Trinidad and Tobago e da Venezuela. Ommata (O.) gallardi Peñaherrera & Tavakilian, 2004 (Rhinotragini), descrita originalmente da Guiana Francesa, é registrada para Trinidad and Tobago.

Revision of the genus Altitatiayus Weinreich(Coleoptera, Lucanidae, Lucaninae)

Revision of the genus Altitatiayus Weinreich (Coleoptera, Lucanidae, Lucaninae). The South American genus Altitatiayus Weinreich is revised and now includes six species, A. rotundatus (Boileau), A. ruficollis (Lüderwaldt), A. godinhorum (Bomans & Arnaud), A. dulceae (Bomans & Arnaud), A. trifurcatus (Grossi & Racca-Filho) and A. koikei sp. nov. (Minas Gerais, Brazil). All species are described and illustrated. For the first time male and female genitalia are illustrated for five species and observations on the behavior of two species are included.

Immatures of Syphrea uberabensis guerini Bechyné (Coleoptera, Chrysomelidae, Alticini)

Immatures of Syphrea uberabensis guerini Bechyné (Coleoptera, Chrysomelidae, Alticini). Larva and pupa of Syphrea uberabensis guerini are described and illustrated for the first time and a comparison with the described immatures of other Alticini species from Neotropical region and also with Hermaeophaga mercurialis (Fabricius, 1792), from Palearctic region, is presented. Tibouchina stenocarpa (DC.) Cogn. (Melastomataceae) (quaresmeira-do-cerrado) is registered as a new host plant for this species of Alticini.

A new species of Aristobrotica Bechynéand a checklist of the genus (Coleoptera, Chrysomelidae, Galerucinae)

A new species of Aristobrotica Bechynéand a checklist of the genus (Coleoptera, Chrysomelidae, Galerucinae). A new neotropical species of the Section Diabroticites (Luperini, Diabroticina) is described and illustrated. Aristobrotica capillosa sp. nov., from the state of Amazonas, northern Brazil, is the only species of the genus with elytra densely covered by erect hairs. The genus Aristobrotica Bechyné, 1956 now comprises 17 species, with only one occurring in Central America, Aristobrotica allardi (Jacoby, 1887) from Panama, and the remaining 16 are South American. A checklist of Aristobrotica species and their geographic distribution is also provided.

Toxic effects of essential plant oils in adult Sitophilus oryzae (Linnaeus) (Coleoptera, Curculionidae)

Toxic effects of essential plant oils in adult Sitophilus oryzae (Linnaeus) (Coleoptera, Curculionidae). Stored grains are subject to losses in quality nutritional value and in sanitation from the time they are stored to the time they are consumed. Botanical insecticides may offer an alternative solution for pest control. The objective was to test the insecticidal properties of the essential oils of Cymbopogon citratus (leaf), Zingiber officinale (root) and Mentha sp. (leaf). The efficacy of these oils was tested to control the rice weevil, S. oryzae, using hydrodistillation. Chemical analysis of the essential oils was carried out by gas chromatography. Major components of C. citratus were geranial (48%) and neral (31%), of Z. officinale were α-zingibereno (13%), geranial (16%), neral (10%) and α-farneseno (5%) and of Mentha sp. was menthol (92%). Bioassays were carried out by fumigation and topical application. In topical application assays, the essential oil of C. citratus had greater toxicity (LC50 0.027 µL mL-1) and shorter exposure time than the oils of the other two plants. After 24 h and 48 h, 70% and 100% mortality of S. oryzae occurred, respectively. In fumigation assays, essential oil of Z. officinale had a lower LC50 (1.18 µL cm-2) and 70% mortality after 24 h exposure. Therefore, we recommend the use of essential oils of C. citratus and Z. officinale to control the rice weevil S. oryzae.

Susceptibility of Alphitobius diaperinus (Panzer) (Coleoptera, Tenebrionidae) to cypermethrin, dichlorvos and triflumuron in southern Brazil

Susceptibility of Alphitobius diaperinus (Panzer) (Coleoptera, Tenebrionidae) to cypermethrin, dichlorvos and triflumuron in southern Brazil. The lesser mealworm, Alphitobius diaperinus (Panzer), is an important insect pest in poultry houses in Brazil. Susceptibility of the lesser mealworm collected from eight poultry houses in Paraná state, southern Brazil, was evaluated for cypermethrin, dichlorvos and triflumuron. Adult A. diaperinus were tested in bioassays with cypermethrin and dichlorvos. Larvae were fed rabbit feed wetted with a triflumuron-water solution. Concentration-mortality regressions were estimated using Probit analysis and resistance ratios were calculated based on the susceptible population. Among the field populations evaluated, cypermethrin LC50 values for adults, ranged from 68.1 to 6,263 ng (AI)/cm². LC50 values for adults challenged with dichlorvos ranged from 10.3 to 1,385 ng (AI)/cm². One population from Pato Branco showed reduced susceptibility to triflumuron (LC50 = 272 µg (AI)/ml of solution) when compared to the most susceptible population (LC50 = 109.8 µg (AI)/ml). Application of cypermethrin and dichlorvos analogues should be managed with caution to minimize insecticide resistance problems.

Brachylophora, a new brachypterous genus of Rhopalophorini (Coleoptera, Cerambycidae)

Brachylophora, a new brachypterous genus of Rhopalophorini (Coleoptera, Cerambycidae). Brachylophora auricollis (Bruch, 1918) comb. nov. = Pasiphyle auricollis Bruch, 1918, originally described from Argentina (Salta), is redescribed and illustrated. Although with reduced elytra, the genus is transferred from Rhinotragini to Rhopalophorini based on the following characters: eyes well separated in both sexes, frons between eyes depressed and lacking frontal suture; pro-, meso-, and metasternum planar; mesothorax parallel-sided, not at all declivous before mesosternal process; metasternum large, together with mesosternum twice length of prosternum, metepisternum very wide, entire suture separating it from metasternum clearly visible when viewed from below; female ovipositor shortened with short cylindrical styles; and, more generally, structural features of hind legs, and surface ornamentation. Habitus similar to Coremia group. Bolivian specimens were netted as they visited flowers of Croton sp. (Euphorbiaceae).

O gênero Megacyllene s. str. Casey (Coleoptera, Cerambycidae) na Mata Atlântica: descrição de duas espécies inéditas, chave para identificação e novas ocorrências

O gênero Megacyllene (s. str.) Casey (Coleoptera, Cerambycidae) na Mata Atlântica: descrição de duas espécies inéditas, chave para identificação e novas ocorrências. Na Mata Atlântica ocorrem vinte e cinco espécies de Megacyllene (s. str.) Casey, 1912. Espécies novas descritas: M. globosa sp. nov. de Arapongas, Paraná, Brasil e M. guarani sp. nov. do San Estanislao, San Pedro, Paraguai. Megacyllene (Megacyllene) insignita (Perroud, 1855) é revalidada. Chave para espécies da Mata Atlântica e novos registros de ocorrência para 12 espécies são fornecidos.