86 
Psyche 
[Sept.-Dee. 
with a slender, posteriorly-pointed, yellow wedge down the 
middle narrowly reaching the apex. Abdomen: elongate, ev- 
erywhere black and shining; there is a posterior fascia and 
medial extension upon the second segment, a medial basal spot 
on the third segment and the whole of the first segment opaque. 
The medial vittae of the second segment from a posterior view 
is margined with whitish pollen. Legs: shining black, the hind 
femora much thickened in the middle, the anterior fore tibiae 
reddish-brown, the hind pair light brownish-red; all of the 
tarsi are light brown, the hind pair almost orange. Apex of 
hind tibiae with a fairly sharp spur. Wings: apical half of 
wings to posterior margin strongly tinged with brown. 
Holotype: a female, Summit, Canal Zone, February 24, 
1940, A. G. B. Fairchild. 
This fly may prove to be the female of juliginosus Hull. 
However there are a number of dissimilarities as outlined above. 
Eristalis thalia n. sp. 
Related to mitis Curran and parvulus Williston. It has no 
grey spot on the second segment of the abdomen. Thorax 
brownish-black, black trivittate. 
Male. Length 8 mm. Head: the eyes are densely long brown 
pilose, the face front and cheeks are shining black, the sides of 
the face and front before the antennae brown. The face below 
antennae, and widely on the sides as low as the bottom of the 
tubercle, is yellowish-white pubescent and long yellowish-white 
pilose. The pile of the front and vertex is black; of upper 
occiput mixed black and yellow. Antennae: first joint brown; 
others wanting. Eyes not quite touching; they approach one 
another near the middle of the front. Thorax: opaque brown- 
ish black, feebly shining along the lateral margins with a 
narrow, anteriorly attenuated, medial black vittae evanescent 
before reaching the scutellum and a similar, slightly wider 
vittae on the middle of each half of the mesonotum, obscurely 
interrupted at the medial end of the suture. The anterior por- 
tion of the lateral vittae is twice as wide as the medial one ; the 
posterior end of this vittae is pointed. Viewed posteriorly the 
three vittae of the mesonotum are separated by two wide yel- 
lowish-brown pollinose stripes. Pile of pleurae and mesonotum, 
except just behind the suture and upon the posterior half of the 
post calli where it is black, entirely pale yellow. Scutellum 
