1 66 Annals Entomological Society of America [Vol.11, 



are other variations in the extent of the black and reddish of the legs 

 in the specimens at hand; claws and pulvilli long and quite slender. 

 Wings hyaline, posterior branch of the third vein bent slightly forward 

 at the middle of the length beyond the furcation and then backward 

 just before the margin of the wing. Abdomen dark, thinly clothed 

 with gray dust and numerous gray hairs which are longest at the sides. 

 Ovipositor black with a circlet of spines at the tip ; male genitalia rather 

 short, superior part not protruding beyond the other part which is 

 tipped with a pencil of long white hairs. 



Specimens from Rosser, Texas, taken by F. C. Pratt; Clark County, 

 Kansas, by F. H. Snow; AnglesHt, New Jersey, by H. S. Harbeck, 

 Havana, IlHnois, and from Admore, Oklahoma; Fromont, Nebraska, 

 and from other places in Texas besides the one mentioned. It appears 

 to be more eastern in distribution than leucopogon. 



This name was carried by some specimens in the Francis Hunting- 

 ton Snow Collection but I cannot find that any description has ever 

 been published. 



Asilus leucopogon Williston. 



Light gray, wings hyaline, scutellum sparsely clothed all over with 

 rather long white bristles, male genitalia with the superior part pro- 

 truding at least hajf its length beyond the inferior part which is with- 

 out the pencil of hairs present in cacopilogus. Length 15-18 milli- 

 meters. 



Face and front broad, clothed with nearly white dust, facial gib- 

 bosity most prominent just above the oral opening, gradually sloping 

 to the level of the face slightly below the insertion of the antennae, 

 mystax composed entirely of white bristles. Antenna black, third 

 segment shorter than the first two together, arista about as long as its 

 segment, palpi and proboscis black, the former with black hair; beard 

 white, occipito-orbital bristles white or very pale yellowish. Thorax 

 gray, mid-dorsal brown stripe not conspicuous, wings rather narrow 

 and h3'aline ; legs in large part red, each femur on the anterior side with 

 a black marking which varies in extent in different specimens; each 

 tibia infuscated toward the tip. x-Vbdomen darkened somewhat and 

 often with distinct gray posterior margin to each segment. Oviduct 

 usually shining black, but reddish in part in some specimens, male geni- 

 talia usually red, superior part extending beyond the inferior part 

 for about half its length. 



Professor Aldrich has kindlv sent me a pair of this species from 

 the material which Williston had when he wrote the original descrip- 

 tion. 



Specimens are at hand from Pierre, South Dakota; from Morton 

 County, Kansas, and Bill Williams Fork, Arizona, collected by F. H. 

 Snow. A number of specimens collected by myself near Tombstone, 

 Arizona, August 5, 1907, are larger than the others and distinctly more 

 reddish in color but present no structural differences. 



