317 



onotiini without traces of pruinescence; discal hairs long and strong, 

 scutellar hairs numerous and long. Hypopygium as in Figure 2, Plate 

 XIX ; the long hairs on abdomen located on middle of segment in a 

 transverse row. Legs with long surface hairs, basal joint of hind tar- 

 sus subequal to second; fourth slightly longer than fifth. Costa to 

 middle of wing; venation as in Figure i, Plate XXII. 



Female. — Agrees w-ith the male in coloration except that the wings 

 appear darker owing to the more abundant clothing of hairs, and the 

 groups of white hairs are more conspicuous. 



Differs from the male in having the antennae short-haired, the basal 

 nine flagellar joints as in Figure 13, Plate XXI, the sensory organs al- 

 most straight, the apical five joints elongated, the last being the long- 

 est. In other respects similar to the male except that it is generally 

 much more robust and slightly smaller. 



Length: male, 2.5-3 mm.; female, 1.75-2.5 mm. 



Illinois localities : Urbana, July and September, and Algonquin, 

 May. Several taken at light in Urbana by Mr. Hart and the w'riter. 



I have before me specimens taken by Mr. Hart at Niles, Mich., 

 July 13, 1914, at light. 



Originally described from Pennsylvania, District of Columbia, and 

 Colorado. Subsec[uently recorded by Howard as having been reared 

 from larvae found in cow dung in Virginia. All stages have been de- 

 scribed by Long* from Texas, the larvje being recorded as occurring 

 gregariously on the under side of cow dung. In Illinois the larvae have 

 been found by j\Ir. Hart, at L^rbana, beneath boards lying on the 

 ground. 



4. FoRCiPOMYiA PiLOSA Coquillett 



Ceraiopogon pilosus Coquillett, Proc. U. S. Nat. Mus., Vol. 2.5, 1902, p. 87. 



This species is very similar to pcrgandci, differing principally in 

 color and in the antennal and tarsal proportions of the male. The legs 

 are very bright yellow with a dark suffusion on the hind femora W'hich 

 is sometimes indistinct. The patch of pale hairs at apex of third vein 

 is very distinct in the female. 



Illinois localities: Thomasboro, July 20, 1914, both sexes flying 

 about trunk of old apple-tree in the afternoon; St. Joseph, ]\Iay 3, 

 1914, and Urbana, Mav to August, 1914 (C. A. Hart and J. R. Mal- 

 loch). 



I have also seen specimens taken by Mr. Hart at South Haven, 

 Mich., July 15, 1914, at light. 



Originally described from the District of Columbia. 



Early stages undescribed. 



*Biol. Bull., Vol. 3, 1902, p. 7. 



