SUBFAMILY CALLIPHORINAE 305 
Genital segments black, the first without a marginal row of 
bristles; inner and outer forceps of about equal: length, elongate, 
narrow, the tips narrowly rounded; outer forceps gently curved 
anteriorly; inner forceps gradually separating to tips. Internal 
anatomical features (pl. 28, A and B) as illustrated. 
Female. Head height 15.0; eye height 8.2; bueca 0.54 of eye 
height; length of head at antenna 7.0 and at vibrissa 8.0; para- 
faciale 2.5 in width opposite lunule; distance between vibrissae 
3.1; head width 17.0; front at narrowest (at vertex) 33.5 of 
head width, 0.39 at lunule. Wing with costal sections 2 to 6 in 
the proportion 115:80:160:49:12. Otherwise as in male except 
for normal sexual differences. 
Length. 9-13 mm. 
A few specimens, particularly females, have a small amount 
of reddish or tawny hair before the metacephalic suture. In 
such eases other characters are available to separate this species 
from others closely related. About five percent of the adults 
have three posterior bristles on one middle tibia or the other. 
Distribution. Nearctic: Alaska and Newfoundland south to 
Colorado and New York. The species is most abundant in the 
northern United States and southern Canada, particularly in 
the Rocky Mountain districts. It occurs in late July and August. 
Aldrich saw the type of terrae-novae in Paris in 1929. He 
noted that it was a female and difficult to classify satisfactorily, 
but that he agreed with Séguy in placing it near ngribarba 
Shannon. Séguy (1925) noted that the type had reddish hair 
posteriorly on the metacephalon but this is not invariably the 
case. The type of terrae-novae is undoubtedly one of these. 
Biology, habits, and immature stages. Egg. Similar to that 
described for vicina. 
Larva. Third instar: Segments 2 to 9 anteriorly with com- 
plete spinose bands, segments 10 to 12 bare anterodorsally, seg- 
ments 2 to 5 bare posteriorly, segments 10 and 11 posteriorly 
with complete spinose bands, segments 2 to 9 bare postero- 
dorsally, segment 12 bare dorsally. Inner tubercle on dorsal 
surface of posterior depression largest, the median and inner 
tubercles smallest and usually closer together, the outer tubercle 
on ventral surface of posterior depression largest, the median 
nearly as large, the inner much the smaller of the three. Spines 
usually single-pointed but numerous spines have two or three 
points. Anterior spiracles each with 10 (10-11) rounded aper- 
tures, posterior spiracles (pl. 48, C) and cephaloskeleton (pl. 48, 
D) as illustrated. 
The species may be reared in exactly the same way as vicina 
