1909] Rohherflies of the Genus Asihis 163 



Asilus erythocnemius n. sp. 



Dark brown species, each femur except a preapical band black, 

 other parts of the legs largely red. Third antennal segment rather 

 wide, arista almost as long as its segment, nearly all the bristles of the 

 body and legs black. Length 11-14 millimeters. 



Facial gibbosity reaching about half way to the antennae, mystax 

 composed mostly of pale yellow bristles although there are a few short 

 black ones above, occipito-orbital bristles black, beard white. Thorax 

 clothed with yellow dust, but with a distinct black mid-dorsal stripe. 

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

 border ; femur of each leg black with the exception of a preapical band 

 which is red; each tibia red, usually with a dark marking near the 

 middle of the anterior side, apexr also dark; metatarsi red, other 

 segments mostly black. There is a tendency in some specimens 

 for the hind tibia to be darkened more or less leaving only a narrow 

 band at the base yellow, especially is this coloring apt to show on 

 the anterior side. Front femur with a row of rather weak white 

 bristles on the lower side. Abdomen colored like the thorax, two or 

 three small bristles on either side before the incisures; from side view 

 the upper forceps of the male genitalia widest at about two thirds the 

 length, lower side nearly straight. 



Specimens from Mass., N. Y., Ct., N. J., Kan., Mont., Colo., Md., 

 Wyo. and Ohio. 



Asilus astutus Williston (Fig. 35). 



Yellowish brown species, form rather robust, femora black anter- 

 iorly, preapical band and posterior side red. Thorax and legs with 

 black bristles. Antennal arista about one third as long as the seg- 

 ment which bears it. Length 15 millimeters. 



Facial gibbosity most prominent just above the oral opening, gently 

 sloping to the level of the face about half way to the antennae. Mys- 

 tax mostly pale yellow but with several black bristles above, beard 

 pale yellow; antenna black, third segment distinctly longer than the 

 first two together, arista about one third as long as the third segment. 

 Occipito-orbital bristles straw yellow. Thorax clothed with yellow 

 dust, mid-dorsal stripe dark brown and distinctly split on the anterior 

 part. Wing in large part clouded, base and disk largely hyaline. Each 

 femur black anteriorly with a preapical red band, red posteriorly; 

 front femur with a few black bristles beneath ; each tibia dark anter- 

 iorly with a narrow red base, posterior side red; tarsal segments red, 

 each more or less darkened apically. Abdomen clothed with yellowish 

 brown dust, posterior margins of the segments not distinctly lighter; 

 no bristles before the incisures. In the type male specimen before me 

 only seven abdominal segments are visible. Genitalia rather small 

 and red. 



The types are in the Francis Huntington Snow Collection and are 

 labelled as coming from California. There are no other records of the 

 occurrence of the species known to me. 



