ABSTRACT Perilestes eustaquioi sp. nov. (holotype male deposited in ABMM collection) from the state of Bahia (municipality of Una), northeastern Brazil, is described and illustrated based on one male specimen. It differs from the other species of the genus mainly by the larger size of the anteclypeus in relations to the postclypeus. Together with P. fragilis Hagen in Selys, 1862 from the state of Sergipe and P. solutus Williamson & Williamson, 1924 from the state of Ceará, these are the first records of Perilestidae from northeastern Brazil.

Philogenia nemesioi, a new damselfly from Peru (Odonata, Megapodagrionidae). Philogenia nemesioi sp. nov. is described and illustrated based on one male specimen collected on forests of the eastern slope of the Peruvian Andes at 900 m. It belongs to the cristalina group, but differs from other species of the group by the structure of the anal appendage.

Ischnura mahechai sp. nov. is described and illustrated based on specimens collected at the Eastern Andean mountain range of Colômbia. The species is close to Ischnura cruzi De Marmels, 1987 but differs from it by the structure of male anal appendages and female hind prothoracic lobe. The specimens were collected on a small Andine lake at 3,600 m, the 4th altitudinal record for a resident odonate.

Heteragrion luizfelipei sp. nov. de Santa Catarina, Heteragrion gracile sp. nov. de Minas Gerais e Heteragrion mantiqueirae sp. nov. de São Paulo são descritos e ilustrados. São descritos os caracteres estruturais e de cor que distinguem essas espécies daquelas descritas no grupo 2 de Selys. O holótipo de Heteragrion dorsale Selys, 1862 é redescrito e ilustrado.

Heteragrion luizfelipei sp. nov. from Santa Catarina, Heteragrion gracile sp. nov. from Minas Gerais) and Heteragrion mantiqueirae sp. nov. from São Paulo are described and illustrated. The color and structural characters that distinguish these species from those of Selys group 2 are discussed. The holotype of Heteragrion dorsale Selys, 1862 is redescribed and illustrated.

Lauromacromia bedei é descrita e ilustrada com base em um exemplar macho coletado em um rio da região de cerrado do estado de Minas Gerais, Brasil.

Lauromacromia bedei is described and illustrated from a single male specimen collected in a river at the "cerrado" region of the State of Minas Gerais, Brazil.

Neoneura anaclara sp. nov. e N. leonardoi sp. nov. são descritas e ilustradas com base em espécimes coletados no sul do Brasil. Essas duas espécies são únicas no gênero Neoneura pela estrutura de seus apêndices anais.

Neoneura anaclara sp. nov. and Neoneura leonardoi sp. nov. are described and illustrated from specimens collected in Southern Brazil. These two species are unique in the genus Neoneura by the structure of their anal appendages.

Criou-se o gênero Amazoneura para as espécies A. ephippigera (Selys, 1886), A. westfalli (Machado, 2001) e A. juruaensis sp. nov. O novo gênero é próximo de Forcepsioneura Lencioni, 1999 mas difere dele principalmente por ter o tubérculo postero-lateral do lobo médio do protórax pouco desenvolvido e pela cor escura do metepimero e da parte posterior da cabeça. A. juruaensis sp. nov. (holotipo macho, Acre, Brasil) difere das outras duas espécies do gênero principalmente pela estrutura dos apêndices anais superiores.

The genus Amazoneura is erected to contain A. ephippigera (Selys, 1886), A. westfalli (Machado, 2001) and A. juruaensis sp. nov. The new genus is close to Forcepsioneura Lencioni, 1999 but differs from it mainly by the poorly-developed postero-lateral tubercles of the medium prothoracic lobe, by the dark colour of the metepimerum and of the rear of the head. A. juruaensis sp. nov. (holotype male, Acre, Brazil) differs from the other two species of the genus mainly by the structure of the superior anal appendages.

O conteúdo de noradrenalina do hipotálamo e do tronco encefálico de ratos controle e inoculados com a cepa Y (300.000 tripomastigotas, i.p.) de Trypanosoma cruzi foi medido pela técnica fluorimétrica de Anton e Sayre. Os animais foram sacrificados 20 e 32 dias depois da inoculação. Para avaliação do grau de desnervação simpática do coração dos animais infectados, a aurícula direita foi observada com microscópio de fluorescência após tratamento histoquímieo pela técnica do ácido glioxílico. O conteúdo de noradrenalina do hipotálamo e do tronco encefálico dos animais infectados não diferiu do medido nos animais controle. Contudo, um quase completo desaparecimento das fibras adrenérgicas foi observado no coração dos animais chagásicos, sugerindo que o mechanismo envolvido na lesão discrimina neurônios adrenérgicos centrais e periféricos.

Noradrenaline was assayed fluorimetrically in the hypothalamus and brainstem of rats killed 20 and 32 days after inoculation with the Y strain of T. cruzi (300,000 trypomastigotes i.p.). In these animals and their normal controls the right atrial appendages were submitted to the glyoxilic acid fluorescence technique for the demonstration of noradrenergic nerves. The noradrenaline content of the brain-stem and hypothalamus of the infected animals was not significantly different from that of controls. In the atrial appendages, however, an almost complete noradrenergic denervation was observed. This result indicates that the mechanism involved in neuronal lesion in Chagas'disease discriminates between peripheral and central noradrenergic neurons.

The type series of Aeshna punctata Martin, 1908 was examined and some inconsistent points in the original description were elucidated. A lectolype was designated, redescribed and illustrated. The two females originally referred to this species actually belong to the Mexican species Aeshna jalapensis Williamson, 1908. Thus, A. punctata should be dropped from the faunistic list of Mexico.