1924] 
NeiD Calyptrate Dvptera from New England 
203 
vitiate appearance. Abdomen with a slender black dorso-central 
stripe and very faint dark checkering, the surface with yellowish 
gray pruinescence. Legs yellow, fore coxae brownish, mid and 
hind coxae brownish, all trochanters, and the tarsi fuscous. Wings 
yellowish, noticeably so basally. Calyptra and halteres yellow. 
Eyes at narrowest part of frons separated by a little more 
than width across posterior ocelli; antennae not extending to 
lower margin of face, third joint twice as long as second; cheek 
about one eighth as high as eye. One pair of long widely sep- 
arated acrostichals just in front of suture, the remainder of 
acrostichal area proximad of suture with 6 to 8 series of setulose 
hairs; 3 pairs of post-sutural dorsocentrals. Abdomen elongate 
ovate; fifth sternite with a groad rounded posterior excision, 
the lateral extremities slightly recurved ventrad as in Hydro- 
taea; hypopygium retracted, glossy black. Fore femur with a 
series of stout bristles on postero-ventral surface which is dup- 
licated beyond middle, and on apical third the bristles become 
longer, more slender, and dense; antero- ventral surface with 
very short bristles up to beginning of the preapical excavation; 
fore tibia with black shaggy hairs on the entire length of postero- 
ventral surface, which are most dense near base; mid femur with 
several very long bristles on basal half of anterior surface; the 
ventral surface with a few widely placed bristles; mid tibia with 
three posterior bristles; hind femur with 5 or 6 long bristles on 
apical fourth of antero-ventral surface; hind tibia with apical 
half of ventral surface furnished with dense black hairs which 
are longer and bristly on antero-ventral surface; antero-dorsal 
surface with short hairs and 2 or 3 weak bristles; postero-dorsal 
surface with 2 or 3 bristles, the upper one straight ; apex of tibia 
with 2 or 3 bristles, one of which on ventral surface is long and 
curved; tarsi long and slender. Outer cross- vein oblique, curved; 
veins 3 and 4 convergent apically. 
Length, 8 mm. 
Type locality, Chester, Mass., July 25, 1913 (C. W. Johnson). 
The only allied North American species which has yellow 
legs is succedens Stein, but this has the prealar bristle absent and 
the abdomen largely yellow. H. succedens appeal's to be a true 
Hydrotma. 
