1921] NATUR\L SCIENCES OF PHILADELPHIA. 47 



Yurimaguas, Peru, April 5, 1920 (H. S. Parish). 

 Napo River, Peru, June 6-16, 1920 (H. S. Parish). 



Genus DICRANOMYIA Stephens. 

 1829. Dicranomyia Stephens, Cat. Brit. Ins., vol. 2, p. 243. 



In the territory of the BraziUan Amazons, species of the genus 

 Dicranomyia appear to be verj- uncommon both as regards species 

 and individuals. In Peruvian territory, however, they become 

 more numerous. 



Dicranomyia capnora sp. n. 



Antennae dark brown, the first scapal segment white; front and 

 anterior part of the vertex silvery-white pubescent; vertex with a 

 conspicuous conical tubercle; mesonotum yellowish orange, the 

 lateral margins darkening into clove-brown; legs pale testaceous 

 yellow, the tarsi and tips of the tibiae white; wings deep smoky, 

 the costal and apical regions more intense; a narrow dark pattern 

 along the cord, outer end of cell 1st Mz and origin of Rs; Sc long. 



Male. — Length 5.5-6.5 mm. ; wing 7.7-8.3 mm. 

 Female.- — Length 6.6 mm. ; wing 7.8 mm. 



Rostrum and palpi brownish black. Antennae with the first 

 segment .of the scape silverj^-white ; remainder of the antennae dark 

 brown; the flagellar segments in the male are long-cylindrical, each 

 with a short basal pedicel that is paler than the rest of the segment. 

 Head moderately broad; front and anterior part of the vertex pure 

 silvery- white; remainder of the head dark brown; vertex produced 

 into a conspicuous conical elevation that is directed dorsad and 

 slightly caudacl. Mesonotal praescutum with the broad median 

 area conspicuous yellowish orange, gradually darkening into clove- 

 brown on the lateral margins of the sclerite; median area of the 

 scutum and the scutellum yellowish orange, the lateral areas darker; 

 postnotum pale brown. Pleura testaceous yellow. Halteres dark 

 brown. Legs with the coxae and trochanters light yellow; femora 

 and tibiae pale testaceous yellow, the apex of the tibiae and the 

 tarsi excepting the terminal segment white; last tarsal segment and 

 the claws blackish. Wings with a strong smoky tinge, more intense 

 along the costal and apical regions; the basal, posterior and anal 

 cells sometimes with paler centers; a sparse darker brown pattern, 

 these spots arranged as follows: at origin of Rs; tip of Sc; r; along 

 the cord and outer end of cell 1st AIn; veins dark brown. Venation: 

 Sc long, extending to beyond midlength of the long Rs, Sc-i at the 

 tip of Sci; Rs strongly angulated to slightly spurred at origin; de- 

 flection of Ri + i about equal to the basal deflection of Cui; cell 

 1st Mo closed, comparatively short; basal deflection of Cui close 

 to the fork of M but slightly variable in position, longer than Cui. 

 Abdominal tergites dark brown, the sternites and hypopygium 

 more yellowish brown. Male hypopygium with the dorsal pleural 



