19301 
N ematoproctus in North America 
171 
width of face, with many black hairs, which are nearly as 
long as the palpi ; front blue-green, with white pollen ; an- 
tennae black, first joint bare above, a little yellowish below, 
third small, somewhat conical, as long as wide, arista basal ; 
occiput green, white pollinose; orbital cilia and the beard 
white, a few of the minute upper cilia black. 
Thorax blue-green, dorsum bright, shining with a little 
white pollen on the front slope; reddish coppery spots on 
the sides extend from the suture over the root of the wings ; 
pleurae more black, especially the posterior edge, a little 
white pruinose ; first abdominal segment coppery and 
green, with long black bristles above; second and third 
segments yellow, second narrowly black at base and very 
narrowly on hind margin; third segment with a narrow, 
sharply defined, white pollinose band at base, followed by 
a black band of equal width, posterior margin very nar- 
rowly black; fourth purplish black on basal half, more 
green on apical half, fifth colored as the fourth, only more 
blue posteriorly, sixth segment small, violet; hairs on dor- 
sum of abdomen black, on lower edge of sides of three 
basal segments long and yellow, above these are a few long 
black hairs ; venter with many long yellow hairs ; hypopy- 
gium black, posterior surface with about twelve bristles; 
outer lamellae black, narrow, about as long as height of 
hypopygium, fringed on one side with stiff black hairs ; two 
pair of inner appendages, first black, wide at base, tip 
somewhat knob-like with several minute spines, the other 
yellowish, hair-like, about half as long. 
Fore coxae wholly pale yellow, with rather long yellow 
hair, four large black bristles and one small one; middle 
and hind coxse black with yellow tips ; all femora and tibiae 
yellow, hind femora a very little darkened at tip, hind tibiae 
blackened from near their middle, extreme tip of middle 
tibiae sharply black; fore and middle femora with long 
yellow hairs on lower surface; fore tibiae with a row of 
rather long black hairs on lower posterior edge and a row 
of about six bristles on upper posterior edge of basal half, 
which are longer than diameter of tibia; tarsi plain, an- 
terior ones yellow with last three joints blackish, first joint 
with a row of stiff black hairs below, these are as long as 
