1909] Robbcrflies of tJic ijcuiis Asiliis 157 



Asilus notatus Wiedemann. 



Black species. Legs black except the extreme base of each tibiae. 

 Length 14-18 millimeters. 



Face and front clothed with gray dust, facial gibbosity prominent, 

 mystax with a few black hairs above and numerous pale yellow or 

 white hairs beneath ; beard white ; occipito-orbital bristles mostly 

 black, other bristles and hairs of the occiput white ; proboscis and palpi 

 black, the latter with black hair. Thorax mostly clothed with gray 

 dust although the thorax has a yellowish cast; mid-dorsal stripe black,, 

 split anteriorly ; wings hyaline, slightly clouded at the apex and along 

 the posterior border; the legs are black except the narrow base of 

 each tibia which is reddish; there is some variation in the legs, the 

 reddish of the tibiae may be more extensive than indicated and the 

 metatarsi may be reddish either wholly or in part. It is quite charac- 

 teristic for this species to have areas of close lying golden pile, especially 

 on the lower sides of the tibiae and metatarsi. Abdomen black, 

 each segment narrowly white posteriorly. Upper forceps of the male 

 genitalia small and short as compared with those of sadvtes. 



N. Y.. N. J., D. C, Mass., Ct., Ills., Canada, Ind., Mo., Kan., Pa., 

 Me. and Ohio. 



Asilus callidus Williston. 



Black, each abodminal segment with an apical white band, pre- 

 apical band of each femur, each tibia and each metatarsus largely 

 brown. Length 15-18 millimeters. 



Facial callosity prominent, mystax black above and pale ^^ellow 

 or white below. Face and front clothed with gray dust, beard white; 

 palpi and proboscis black, the former with black hair. Occipito- 

 orbital bristles variable but always partially black and in some cases 

 almost wholly black, other hairs and bristles of the occiput pale yel- 

 low. Thorax clothed with gray dust, mid-dorsal stripe black, narrow- 

 ly divided anteriorly. Coxae colored like the thorax; femora black 

 each with a preapical brown band; tibiae brown, each darker on part 

 of the anterior side and at the apex; tarsal segments largelv black, 

 each brown basally or in case of the metatarsus brown except at the 

 apex. Wing hyaline, clouded at the apex and along the posterior 

 border, veins dark colored. Abdomen black, each segment with a 

 white posterior border; male forceps in large part clothed with pale 

 yellow hairs, rather suddenly curved at the tip, shorter than abdomi- 

 nal segments six, seven and eight. 



Specimens from British Columbia and Washington. 



Asilus novae-scotiae Macquart. 



Dark brown body with plain black femora and yellow tibiae. 

 Length 14-18 millimeters. 



Face and front of ordinary width and clothed with yellow dust, 

 facial gibbosity rather prominent, mystax composed of black hairs 

 above and yellowish hairs below, but in some specimens the entire 

 mystax is composed of light colored hairs; antennae black, third seg- 

 ment rather narrow and of the same length as its arista; occipito-orbi- 



