344 



surface of hind coxae and apical 4 joints of hind tarsi fuscous. Wings 

 clear, veins pale brown. Halteres reddish yellow. 



Eyes separated by about one seventh the head-width ; antenna 

 about \y 2 times as long as height of head, the flagellum slender, 

 apical joint as long as preceding 2 together. Thorax and abdomen 

 with short hairs. Wing venation similar to that of americana, as in- 

 dicated in key. 



Female. — Differs from the male in having the pleurae entirely 

 black, and the apex of abdomen deep black. 



The wing venation differs slightly from that of the male, the 

 furcation of radius being but little distad of a line drawn from apex 

 of third branch of radius to point of furcation of first and second 

 branches of media. 



Length : male, 1 1 mm. ; female, 1 3 mm. 

 Type locality, Urbana, 111. ; 1 male, June 17, 1890; 2 females, June 

 1 and 2, 1890, — (C. A. Hart). 



Xylomyia tenthredinoides Van der Wulp 



Subula tenthredinoides Van der Wulp, Tijdschr. v. Ent., Vol. 10, 1867, p. 132. 



This species was originally described from specimens obtained 

 from Wisconsin. It has since been recorded from Illinois and Penn- 

 sylvania. There are specimens in our collection here from Algonquin, 

 Urbana, St. Joseph, Augerville, and Grand Tower, — Illinois, all taken 

 in June of various years. 



Steatiomyiid Larvae of Uncertain Generic Location 



Genus incertus i 



Larva (PI. XLIX, Fig. 11). — Length, 7 mm. Pale grayish 

 brown. 



Head rather long, tapered anteriorly; maxillae armed with nu- 

 merous curved hairs apically; antennae long and slender, apical joint 

 short and stout. Body broad, the surface covered with fine hairs (not 

 shown in figure except along lateral margin) ; each segment with very 

 weak bristles arranged in tranverse series much as in Pachygasterinae. 

 Lateral margins of each abdominal segment except the apical one 

 divided into two lobes, the anterior one slender and acute, the pos- 

 terior one much broader and obtuse ; lateral abdominal spiracles rudi- 

 mentary; a number of short bristles surrounding bases of the larger 



