194 
Psyche 
[October 
Orthochaeta dissimilis sp. nov. 
Male and female.- — Black, shining, thorax and abdomen 
with distinct gray pruinescence, most dense on pleura. Head 
black, face and anterior portion of interfrontalia reddish; face, 
frons, and cheeks with white pruinescence; antennae and pro- 
boscis black; palpi yellow. Thoracic dorsum rather indistinctly 
trivittate. Abdomen black or yellowish brown. Legs yellow, 
coxae slightly brownish at bases. Wings clear, more yellowish 
basall}^, veins yellow. Calyptrae white. Halteres yellow. 
Frons slightly over one third of the head width, narrowed 
anteriorly; each orbit with about eight bristles; antennae nearly 
as long as face, third segment broad, its apex with an acute 
upper angle; arista nearly bare, second segment in male about 
twice as long as thick, third very much swollen at base, rapidly 
becoming slender apicalh^; arista of female with second segment 
shorter than in male, the third swollen on its basal third; cheek 
not over one tenth as high as eye, with about six long marginal 
bristles; vibrissa3 long, one bristle above it; proboscis slendee 
Thorax with the same bristles as the genotype, except that there 
are but two scutellars present. Fifth abdominal sternite of male 
with two long processes which are slightly tapered apically, 
their tips rounded. Fore femur with several bristles in a series 
on anterodorsal surface, the one nearest apex much stronger 
than the others; fore tibia with one postero ventral, two postero- 
dorsal, and two anterodorsal bristles; mid and hind femora 
each with several widely spaced bristles on anterodorsal, antero- 
ventral, and posteroventral surfaces; mid tibia with the fol- 
lowing bristles: one anteroventral, two anterodorsal, two pos- 
terodorsal, and one posterior; hind tibia with one anteroventral, 
three posterodorsal and three anterodorsal bristles. Costa with 
short black spinules; last section of veins 3 and 4 nearly parallel. 
Length, 7.5 — 8.5 mm. 
Type, Algonquin, 111., June 3, 1898. Paratypes, Urbana, 
111., May 7, 1907; Great Falls, Va., May 10, 1915; Norfolk, Ct., 
May 21, 1916; Columbus, Ohio, May 7, 1902; and four spe- 
cimens from the Osten Sacken Collection in the Museum of Com- 
parative Zoology, taken in 1874, without legible locality labels. 
