152 Psyche [Sept. -Dec. 
cave and the outer one convex, about twice as long as wide; 
apex pointed and extending well beyond the lowest lateral 
frontal bristle, not noticeably enlarged. Arista clearly sub- 
apical, considerably thickened at the base, not much longer 
than the antenna. Postocular cilia small, the cheeks each with 
a very strong bristle; palpi not enlarged, densely beset with 
strong bristles below, near to, and at, the apex. Thorax very 
stout, the mesonotum very broad and weakly convex, consider- 
ably broader than long; its surface shining, with very sparse 
black hairs; one pair of widely separated dorsocentral bristles. 
Scutellum very short, more than three times as wide as long; 
with four marginal bristles of equal length, the median ones 
very widely separated. Propleura with a large bristle below the 
spiracle. Mesopleura entirely bare. Abdomen with the sixth 
tergite lengthened, its upper surface dull, without hairs except 
for four bristly ones near apex. Hypopygium very inconspicu- 
ous, its lamella strongly bristly. Front tibia with the usual four 
bristles, placed at the basal third, middle, apical third and near 
apex on the anterior surface; their tarsi simple, moderately 
slender. Middle tibiae with a hair-seam that extends to its 
middle as a very thin line; apical half of the tibia with five or 
six indistinct transverse comb-like rows of minute, white bris- 
tles; a pair of bristles, one on each side of the seam, near the 
base and an anteroventral one near the apex. Hind tibiae with 
a single dorsal hairseam, weaker toward the apex, and a similar 
weak series of comb-like bristles, with a series of four rather 
small bristles on the anterior face between the basal and apical 
fourth. Hind femora with a series of rather conspicuous curved 
hairs on the apical third of the lower edge. Wings slightly 
yellowish; veins brown, the third vein paler. Costa extending 
somewhat beyond the middle of the wing, its bristles short and 
closely placed; first section of costa two and one-half times as 
long as the second and third together; third less than half as 
long as the second (25:7:3); fork of third vein very acute; 
fourth vein weakly curved; fifth nearly straight; sixth very 
weakly bisinuate. Halteres yellow. 
Type from “Upper Reaches” of Pachitea, Peru, July 21, 
1920, Cornell University Expedition. Type in the Cornell Col- 
lection, a second male from the same locality has the abdomen 
darker above, with the third, and fourth tergites successively 
