ZooL.-VoL. II.] WHEELER— DOLICHOPODIDM. ir; 



Hypopygium short and thick, black, dusted with white; lamella small cir- 

 cular black discs, fringed with rather feeble brown hairs. Pleuree and coxee 

 black, covered with white dust, the latter tipped with yellowish brown. Legs 

 yellowish brown, infuscated along the upper surfaces of the femora; tar's! 

 blackened towards their tips. Wings with the typical venation. The costal 

 region is more or less blackened, the space below it being crossed by four 

 blackish bands, the longest and darkest of which overlies the posterior cross- 

 vem. The node at the origin of the third and fourth veins is conspicuously 

 black and there is a minute black spot between it and the second vein. Pos- 

 terior edge of wing somewhat infuscated. Halteres and tegulae yellow, the 

 latter with black cilia. 



Female. Length 4.5-5 mm. ; length of wing 3-3.5 mm. Face broader and 

 more prominent than in the male, covered with dark brown dust in the mid- 

 dle, with white dust along the orbit. Palpi larger than those of the male, 

 covered with white dust. Front dull brown, dusted with white near the in- 

 sertions of the antennae. Occiput curiously mottled with velvety black spots. 

 In other respects the coloration of the female agrees with that of the male. 



One male and three females from St. Augustine, Fla., 

 received from Mr. C. W. Johnson, and two poorly pre- 

 served males and a female collected by Mr. F. Rauterberg 

 near Gotha, Fla. (March, 1896). The black band of the 

 wings serves to distinguish this species at a glance from all 

 the other North American species. 



15. Pelastoneurus vagans Loew. 



Plate I, Fig. 15. 



This is our commonest species, occurring sporadically in 

 sweepings together with species of Dolichofus, Hygroceleu- 

 thus, and Gymizopternus. It seems to be rather widely dis- 

 tributed. I have seen specimens from Wisconsin, Illinois, 

 Indiana, New Mexico and western Wyoming, 



16. Pelastoneurus lugubris Loew. 



Plate II, Fig. 28. 



Only the female of this small species was known to Loew. 

 His specimens came from New York. I have taken it in 

 sweepings in July at various localities in Wisconsin, Illinois 

 and Indiana. The male is 2.3 mm. long, with wings only 

 2 mm. in length. Loew's description of the female will 



