i6o Annals Entomological Society of America [Vol.11, 



black ones above; antennae black, third segment about as long as the 

 first two together, arista more than half as long as its segment ; occipito- 

 orbital bristles coarse, black, beard colored like the mystax. Thorax 

 with a distinct brown mid-dorsal stripe, bristles of the posterior part 

 of the thorax black and rather prominent; tip of the scutellum with 

 two black bristles. Front leg with the anterior side of the femur 

 black, preapical band and the posterior side red; tibia red, marking 

 on the anterior side and the narrow apex dark ; tarsal segments some- 

 times wholly red but often each is dark at the apex ; middle and pos- 

 terior legs like the anterior ones. Wing reddish, margins of the veins 

 in large part hyaline. Abdominal segments without distinct lighter 

 posterior margins; male genitalia shining reddish, upper forceps rather 

 small, narrow and straight from side view. 



Males and females taken at Folson, Delaware County, Pennsyl- 

 vania, July 7, 1893, by Charles W. Johnson for whom the species is 

 named. 



Asilus snowii n. n. 



New name for Asilus annulatus Williston, which is preoccupied by 

 A. annulatus Fabricius from East Indies, Syst. Ent. 1775, 794, 12; 

 A. annulatus Macquart from France, Dipt, du Nord 1826, 36, 16. 



A rather large dark brown species. Each femur with the excep- 

 tion of the preapical band, black; tibiae more or less distinctly annu- 

 late with black ; under side of each front femur provided with numer- 

 ous rather long hairs. Length 15-20 millimeters. 



Mvstax with black bristles above and white or pale yellowish ones 

 below; antennae black, third segment long and rather slender, arista 

 usuallv not over half the length of its segment. The row of occipito- 

 orbital bristles mostly black, although in some specimens part of 

 them are yellow. Thorax clothed with yellowish dust and with the 

 usual markings and bristles above; wing in large part clouded with 

 reddish, especially at the apex and along the posterior border, there is 

 a tendency for many of the veins to be margined with hyaline, even 

 in the clouded area. Each femur with a preapical reddish band, front 

 and middle tibiae each with an annulus near the middle and the apex 

 black, each metatarsus in large part yellow, black at the apex, other 

 tarsal segments mostly black, usually narrowly yellowish at base; 

 hind tibiae in large part infuscated, but a narrow basal space is always 

 yellowish and there appears to be more or less variation in the extent 

 of the black in a series of specimens. Abdomen clothed with dust so 

 as to give it a dark brown color, posterior margins of the segments 

 only slightly lighter. 



Specimens are at hand from Canada, N. H., Mo., Penn., N. Y., 

 Mass., Ills., Kansas and Ohio. 



The type of annulatus is in Philadelphia and Mr. E. T. Cresson, Jr., 

 through the kindness of Dr. Skinner, has compared specimens for me. 



