500 PROCEEDINGS OF THE ACADEMY OF [Oct., 
long outstretched hairs; antennae 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 
coxse 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 v/ith a grayish yellow tinge, 
stigma very indistinct, grayish; veins l^rown. Venation: Sc ending 
about opposite the origin of Rs; Rs short, a little longer than the 
basal deflection of RA+i] 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 l^icolored 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 M2. 
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; 
