1 6 2 A finals Entomological Society of A merica [Vol .II, 



front one ; hind leg similar but the tibia except a narrow base may be 

 wholly infuscated. Specimens are before me in which all the tarsi are 

 black and the light color of the tibiae is much encroached upon by the 

 same. Front femur with close lying hairs and a row of distinct bristles 

 on the under side. Abdomen thinly clothed with yellowish dust, pos- 

 terior margin to each segment rather obscurely gray. 



Specimens are at hand from N'. H., Mass., Colo., N. M., Wyo., 

 Toronto, Can., Ct., N. Y., Ills., Ind. and Ohio. 



The species is somewhat variable in size and appearance, but I take 

 it to be fully distinct. Walker's description fits quite well here and 

 prospectus is likely a synonym. 



Asilus rubicundus n. sp. (Figs. 20 and 21). 



Uniformly reddish, mystax pale yellowish, bristles and hairs on all 

 parts of the body light colored. Length 12 millimeters. 



Face and front rather wide and clothed with yellow dust, facial 

 gibbosity not very prominent, mystax pale yellowish, beard white, 

 antennae dark, second segment lighter than the others, third segment 

 about the length of the other two, arista near the length of its segment. 

 Occipito-orbital bristles yellow. Thorax yellowish red with a wide 

 darker mid-dorsal stripe; legs red, outer side of each femur and apex 

 of each tibia slightly darkened; wings small, hyaline, only a slight 

 clouding at the apex and along part of the posterior border. Abdo- 

 men yellow, two or three light bristles on each side before each of the 

 incisures; genitalia red, upper forceps of the male quite wide at the 

 tip and evenly rounded. 



Specimens of this small and distinct species have been taken at 

 Onaga, Kansas, by Crevecoeur in June and July, and in southern 

 Illinois, near Carbondale, also in the same months. The latter speci- 

 mens are in the Illinois state collection of insects at Urbana. 



Asilus mesae Tucker. 



Very small species, clothed with pale yellow dust, bristles of the 

 body and legs, all light colored. Genitalia in both sexes red. Antenna 

 with a very short arista which is hardly differentiated from its seg- 

 ment. Length 8-12 millimeters. 



Facial gibbosity small, mystax composed of pale bristles, antenna 

 black, the third segment is characteristic for instead of having the 

 usual differentiated arista this segment gradually tapers to the apex, 

 occipito-orbital bristles pale yellow. Ground color of the thorax 

 hidden by a coating of yellow dust, wings small and hyaline, slightly 

 clouded at the tip. Femora usually black but variable; tibiae reddish 

 each darker at the apex, tarsi mostly dark, although each metatarsus 

 usually is reddish on the basal part. Posterior margin of each abdom- 

 inal segment narrowly light colored. Genitalia red. 



Usually the small size of this species will lead to its recognition, 

 but it may be confused with rubicundus, from which its antennae will 

 readily distinguish it. 



Specimens are at hand from Colorado, Wyoming and Kansas. The 

 types are in the Francis Huntington Snow Collection. 



