315 



Plate XIX, palpi as in Figure 3. Mesonotum with the discal hairs 

 longer than in male. Abdomen broad, slightly longer than head and 

 thorax combined, the surface hairs much shorter than in male ; apex 

 as in Figure 4, Plate XIX. Legs stouter than in male, the mid and 

 hind tibiae with a series of lanceolate scales on dorsal surface in addi- 

 tion to the long slender hairs (Fig. 4, PI. XXI) ; tarsi as in male. 

 Wings broader than in male and the surface hairs more numerous ; 

 apex of third vein slightly before middle of wing; cubitus forking 

 slightly before apex of third vein. 



Length, 1.5-2 mm. 



Illinois localities : Havana, reared by C. A. Hart from larvse and 

 pupa; which were found amongst damp moss on the shore of the Illinois 

 River in June ; Urbana, April-July, on windows in the daytime and 

 also at night, both sexes; White Heath, November 22, 1913, in woods; 

 Grand Tower, April, at light, and on shore of Mississippi River; and 

 Dubois, in April. 



The original description by Coquillett, was of a female from 

 Alaska. The specimens before me agree with Coquillett's description, 

 and also with a female named by him in the collection of the U. S. 

 Bureau of Biological Survey, from Washington, D. C. 



Early stages undescribed. 



2. FoRCiPOMYiA SQUAMiPES Coquillett 



Ceratopogon squamipes Coquillett, Proe. U. S. Nat. Mus., 1902, Vol. 25, p. 88. 



This species is very similar to cilipcs. It may be distinguished from 

 it as follows : antennal joints more distinctly nodose, sensory organs 

 more elongated; mesonotum opaque, the disc covered with yellowish 

 gray pruinescence ; discal hairs much longer than in cilipes and of a 

 brassy color; abdomen more densely haired; all tibiae with the lanceo- 

 late dorsal scales present, those more attenuated at bases ; the long 

 slender hairs comparatively longer than in cilipes; media with short 

 petiole, the base of the posterior branch indistinct. 



Length, 2.5 mm. 



Illinois localities: Grand Tower, April 22, 1914, at light; and L''r- 

 bana, July 23, 1914 (C. A. Hart and J. R. Malloch). 



I have before me several males which I believe belong to this spe- 

 cies. They agree with the female in coloration except that the tarsi are 

 yellowish and the antennal plumes are blackish. The proportions of 

 the apical four antennal joints are 31, 16, 11, and 13, and the sensory 

 antennal organs are very slender and twice as long as the joints upon 

 which they are situated. Hypopygium as in Figure 3, Plate XXI. 



