1943] North American Chcetopleurophora 51 
spiracle and a few scattered small bristly hairs near them. 
Mesopleura with a large area of bristly hairs above, extending 
anteriorly almost to the spiracle and one unusually long, stout 
bristle near the posterior edge. Front tibiae without any bristles 
before apex. Middle tibiae with a pair of long bristles near the 
base, one at the basal fourth just anterior to the dorsal line and 
one at the basal third just inside the dorsal line; these bristles 
very stout and half as long as the tibia; at the apical fourth 
with a small anterodorsal bristle that does not extend to the 
tip of the tibia. Hind femur broad; hind tibiae each with two 
long stout bristles, both just anterior to the dorsal line, one at 
the basal third and one just before the tip; also with three 
terminal spurs; the tibia with transverse rows comb-like bristles 
on the apical half of its inner surface although these are not so 
clearly comb-like as in some species and do not form rows on 
the basal half. Abdomen subopaque above, without noticeable 
bristly hairs, except at the sides of the second tergite; third 
tergite longer and narrower than the second; fourth very short, 
about four times as wide as long; fifth twice as long as the 
fourth, about twice as wide as long; sixth narrower and longer, 
about quadrate; seventh minute, not emarginate behind; geni- 
talia with sparse bristly hairs, wings narrow, the costa less than 
half as long as the wing (35:75); first section of costa nearly 
twice as long as the second and third combined, third two-thirds 
as long as the second (20:6:4) costal fringe short and delicate; 
fourth vein weakly, evenly curved; fifth very faintly sinuate; 
seventh distinct. 
Type from Ithaca, New York, Sept. 6, 1922. 
This species is similar to the European C. erythronota Strobl. 
but differs at once by the narrower, opaque front which is wider 
than long and distinctly shining in the European species. Also 
the spine near the apex of the middle tibia is reduced to a very 
weak bristle whereas in C. erythronota it is exceedingly large, 
extending beyond the tip of the tibia. These comparisons are 
based on a female from Admont, Austria sent me many years 
ago by Strobl. 
Chaetopleurophora scutellata Brues. 
Trans. American Entom. Soc., vol. 29, p. 344 (1904) ( Phora ). 
Malloch, Proc. U. S. Nat. Mus., vol. 43, p. 426 (1912) ( Para - 
spiniphora ) . 
