150 Annals Entomological Society of America [Vol. II, 



Asilus albicomus n. sp. (Fig. 14). 



Medium sized gray species with red legs and hyaline wings in both 

 sexes. Bristles of the whole body, except a few on the feet and in the 

 extreme upper part of the mystax, white. Length 13 to 15 milli- 

 meters. 



Facial gibbosity prominent reaching nearly half way to the anten- 

 nae. Mystax composed of many light hairs, only a few dark ones 

 above ; bristles and hairs of the occiput light colored ; thorax gray with 

 the usual dark markings above; wings hyaline in both sexes; legs red, 

 femora a little darker anteriorly than posteriorly; each abdominal 

 segment with a gray posterior margin preceded by a row of white 

 bristles which reach nearly over the dorsum, especially forward. 



Both sexes taken by H. K. Morrison in Montana. Type male and 

 female in the United States National Museum. 



Asilus lepidus n. sp. (Figs. 15 and IG). 



Dark colored species, facial gibbosity prominent, mystax composed 

 of numerous hairs, femora largely black, especially on the anterior 

 sides; tibiae mostly reddish, wings in the female hyaline, in the male 

 infuscated, especially on the posterior half. Length 15 millimeters. 



Facial gibbosity prominent, mystax composed of numerous hairs, 

 black above, light below; antennae black; thorax clothed with gray 

 dust leaving the usual markings on the dorsum nearly bare, black bris- 

 tles on the posterior part above, scutellum with two black bristles on 

 its margin. Wing in the female clear hyaline, in the male somewhat 

 infuscated especially beyond the branching of the second and third 

 veins, and somewhat along the veins of the basal part of the wing. 

 Legs with femora black anteriorly and dark reddish posteriorly, tibiae 

 dark reddish, apex of each darkest, metatarsi largely red, other tarsal 

 segments mostly fuscous. Abdomen black, each segment above with 

 a prominent gray border which is preceded by a row of bristles which 

 nearly reaches over the dorsum of the insect, especially forward. 



Male from Colorado. Female from the White Mountains of New 

 Mexico, about 6800 feet elevation, collected July 23, by Townsend. 

 Types in the United States National Museum. 



Asilus willistoni n. n. (Figs. 17, 18 and 19). 



New name for Asilus augustifrons Williston, which is preoccupied 

 by Asilus augustifrons Loew from Asia Minor, Linn. Ent. (1849) IV, 

 126, 64. 



Rather large grayish brown species with brown legs and narrow 

 front and face, wings of the male more or less dark from the base of the 

 first submarginal cell, of the female nearly clear hyaline. Length 

 15 to 20 millimeters. 



Head of medium size; front and face narrow, clothed with dust 

 which varies in different specimens from gray to golden, facial gib- 

 bosity prominent, mystax composed of a large number of hairs, which 

 are black above and white, or sometimes golden, below. Antennae 

 black, first two segments nearly equal in length and together about as 

 long as the third which is of nearly the same length as the arista. 



