500 PROCEEDINGS OF THE ACADEMY OF [Oct., 



long outstretched hairs; antenna? very elongated, nearly as long as the 

 body, the individual segments of the flagellum being greatly elongated. 

 Head reddish yellow. 



Mesonotum reddish yellow with an impressed median line on the 

 praescutum. Pleura reddish with a very sparse grayish bloom. 

 Halteres yellowish, the knobs darker at their tips. Legs with the 

 coxae and trochanters dull yellow; femora yellow, narrowly and 

 indistinctly brownish at the tips; tibiae brownish yellow; tarsi 

 yellowish brown, the tips of the segments brown, the two terminal 

 segments entirely brown. Wings with a grayish yellow tinge, 

 stigma very indistinct, grayish; veins brown. Venation: Sc ending 

 about opposite the origin of Rs; Rs short, a little longer than the 

 basal deflection of R i+5 ; cell 1st M 2 small. 



Abdominal segments dull yellow, brownish laterally; a brownish 

 black subterminal ring. 



Habitat. — British Guiana. 



Holotype, cf , Mallali, Demerara River, British Guiana, March 25, 

 1913 (H. S. Parish). 



Type in the collection of the author. 



A. cincticornis is to be separated from the other species of the 

 genus with bicolored antennae in that it is the basal half of the flagellar 

 segments that is black instead of the apical half (as in picticornis 

 Osten Sacken, varicornis Alexander). 



DICRANOPTYCHA Osten Sacken. 



Dicranoptycha Osten Sacken; Proceedings of The Academy of Natural 

 Sciences of Philadelphia, p. 217 (1859). 



Dicranoptycha winnemana sp. n. 



Altogether pale brownish yellow; wings pale yellow, the costal 

 margin fringed with long golden hairs; radial sector about one and 

 one-half the length of cell 1st M 2 . 



Male. — Length, 6.8-7.2 mm.; wing, 7-7.6 mm. 



Female.— Length, 7.8-8.8 mm.; wing, 8.2-8.8 mm. 



Rostrum and palpi brown, the latter darker. Antennae with the 

 first segment dark brown, grayish pubescent; second segment dark 

 brown; flagellum dull yellow. Head light gray. 



Mesonotal praescutum clear light brownish yellow without stripes; 

 scutellum and postnotum a little more yellowish. Pleura pale 

 reddish yellow. Halteres short, yellow. Legs with the coxae and 

 trochanters pale yellow; femora and tibiae yellow; tarsi similar with 

 the four terminal segments and the tips of the metatarsi light brown. 

 Wings with the membrane tinged with yellow, the veins light brown; 



