94 KANSAS UNIVERSITY SCIENCE BULLETIN. 



Family Asilid^, 



Tolmerus iprairiensis— continued. 



All femora are black on anterior surface excepting preapical red space^ 

 posterior surface red; tibiae red, infuscated or striped with black on 

 anterior surface, the fore and middle pair being encircled with black 

 at tips; tarsal joints red, infuscated on distal portions, and differs in 

 this respect from annulipes Macq. in not being distinctly annulated 

 with black, besides most of the bristles on legs and tarsi are white. 

 Apical portion of wings faintly clouded, including spot in fourth pos- 

 terior cell. Length, 20 mm. ; wing, 10 mm. 

 Tolmerus prospectus, new species. Colorado, Colorado Springs; August, 

 collected on plains in vicinity of the city. Types : Two male specimens 

 in the collection of the University of Kansas. 



Front and face yellowish poUinose, the gibbosity, which occupies more 

 than half of the face, is clothed above with black bristles, below with 

 longer yellow bristles, bordered on each lower side with three black 

 ones of nearly equal length. Antennae black, the first joint clothed 

 with both yellow and black hair, the second with short, black hair, the 

 third joint being equal in length to the first two together; terminal 

 bristle somewhat shorter than the third joint. Front a little wider 

 above than length of first antennal joint, sunken, bordered on each 

 side just above insertions of antennae with a short row of pale bristles, 

 beyond which the hair is black, short, and sparse, but distinct on ocel- 

 lar tubercle. Occipito-orbital bristles wholly pale yellow, joining the 

 long white, silky beard on the cheeks. A long white pubescence 

 covers the fore part of anterior coxae and fore tips of middle coxge. 

 General color of thorax and abdomen grayish opaque pollinose; the 

 two black median stripes on dorsum of thorax are faintly separated 

 from each other as well as from the two large dark spots, one on 

 either side. Halteres brown. Dorsum of thorax fringed laterally 

 with long yellow bristles sparsely placed, including a black one on 

 each side; on the posterior middle area there are shorter black bristles; 

 scutellum with two yellow bristles curving upward and forward from 

 posterior margin. 



Femora black, with preapical red band; fore and middle tibiae red, in- 

 fuscated at middle on front side and black at tip, posterior pair red 

 excepting a black stripe or infuscation along outer surface; tarsal 

 joints reddish and somewhat infuscated. Tips of wings faintly clouded. 

 Genitalia black, with well rounded and slightly curved tips, ventral 

 plates reddish, spHt with distinct medial and lateral grooves. Length, 

 13 mm.; wings, 8.5 mm. 



In consequence of my study of the series of specimens representing the 

 genus Tolmerus, the following table has been prepared as an aid for 

 the disposition of the species: 



Tolmerus— Key to Species, exclusive of the Mexican. 



1. Occipito-orbital bristles both black and yellow, gibbosity of face 



clothed with black and yellow bristles about equal in number. . . 2 

 Occipito-orbital bristles all yellow, gibbosity of face mostly clothed 

 with yellow bristles, black ones scarce if not entirely wanting. . 5 



