1909] Robber flies of the Genus Asilus 141 



Group Cerdistus. 

 willistoni new name. 



angustifrons Williston, Kansas Univ. Quart. II, 71. Name preoccupied. 

 auricomus new species. 

 piceus new species. 

 montanus new species. 

 albicomus new species. 

 lepidus new species. 



Group Tolmerus. 



antimachus Walker, List II, 454. 



callidus Williston, Kansas Univ. Quart. II, 75. 



delusus Tucker, Kansas Univ. Sci. Bull. IV, 92. 



johnsoni new species. 



maneei new species. 



notatus Wiedemann, Auss. Zw. I, 451. Williston, Kansas Univ. Quart. II, 74.. 



alethes Walker, List II, 454. 

 novae-scotiae Macquart, Dipt. Exot. Suppl. II, 46. Williston, Kansas Univ. 



Quart. II, 68. 

 paropus Walker, List II, 455. 



prospectus Tucker, Kansas Univ. Sci. Bull. IV, 94. 

 prairiensis Tucker, Kansas Univ. Science Bull. IV, 9)5. 



anniilipes Macquart, Dipt. Exot. I, 2, 149. Name preoccupied. 

 sadytes Walker, List II, 453. 



tibialis Macquart, Hist. Nat. Dipt. I, 313. Name preoccupied. 

 snowii new name. 



annulatus Williston, Kansas Univ. Quart. II, 70. Name preoccupied. 



Group Epitriptus. 

 erythocnemius new species. 



Group not determined. 

 gracilis Wiedemann, Auss. Zw. I, 445. Osten Sacken, Catal. 235, note on the- 

 type, 

 auratus Johnson, Proc. Acad. Nat. Sci. 1895, 305. 

 californicus new species. 



mesae Tucker, Kansas Univ Sci. Bull. IV, 92. 

 rubicundus new species. 



KEY TO THE SPECIES 



1. On each side of the abdomen near the incisures with a transverse 



row of bristles which are clearly larger than the hairs to be seen 



on the other parts of the segments 7. 



Sides of the abdomen near the incisures without bristles which are 

 clearly larger than the hairs of the other parts of the segments. ... 2. 



2. Large, bright colored species, wings distinctly colored all over 3. 



Smaller, modest colored species, wings pale colored or hyaline 4. 



3. Body and legs uniformly black, wings uniformly rich yellowish 



brown midas Br. 



Body brown, legs pale brown, wings brown with the veins margined 

 with paler sericeus Say. 



4. Scutellum with more than a dozen long bristles on its margin, female 



genitalia with a circlet of strong spines at the tip 5. 



Scutellum with not more than half a dozen long bristles, feinale geni- 

 talia not with a circlet of spines at the tip 6. 



5. Upper forceps of the male genitalia protruding half their length 



beyond the lower forceps leucopogon Will. 



Upper forceps of the male genitalia about equal in length to the 



lower cacopilogus n. sp. 



6. Body black, space between the antennae and the facial gibbosity largely 



shining black nitidifacies Hine 



Body brown, face entirely clothed with yellowish dust astutus Will. 



