7O ENTOMOLOGICAL NEWS. [Feb., 'lO 



males; Fort Garland, Colorado, August 14, 1907 (L. Bruner), 



I female. 



This species is very distinct. The male face marks resemble 

 in a general way those of P. episcopalis Ckll., but the two are 

 quite distinct. The female resembles the same sex of P. asi- 



II ina Ckll. most, but the characteristic broadly rufotestaceous 

 apices of the abdominal segments easily separate it from that 

 species. From P. magniclavis, just described, the female may 

 be separated by the uninterrupted yellow stripe on the collar, 

 and from the females of zisiac, dunningi, sayi, iUinoiensis, 

 polifolii, coloradcnsis, etc., by the partly yellow hind basitarsus. 



Prosopis subtristis n. sp. 



2 . Length 7-7.5 mm. Lateral face marks short, extending from base 

 of mandible to level of insertion of antennae, shaped like those of 9 

 cressoni, yellow. Remainder of head black. Collar wholly black. Tu- 

 bercles yellow with a black spot. Tegulae with a yellow spot, wing 

 bases wholly black. Legs black, the middle and posterior knees, espe- 

 cially the latter, more or less yellow. Head and thorax coarsely, 

 closely punctured. Abdomen black, two basal segments distinctly punc- 

 tured and moderately shiny. Wings smoky, nervures and stigma black. 

 Antennae short, not reaching tegulae, wholly black. 



Type. Warbonnet Canyon, Sioux County, Nebraska, July 

 13, 1901, on Pentstemon glaber (M. Cary). Collection Uni- 

 versity of Nebraska. 



Paratypes. Type locality, July i, 1901, on Symphoricarpos 

 (M. A. Carriker), i female; Jim Creek, Sioux County, Nebr., 

 June 22, 1901, on Malvastrum (M. Cary), i female; Sioux 

 County, 6 females. 



This species is very closely allied to P. varifrons Cresson, but 

 differs in its darker, more reddish wings. Possibly it is only a 

 variety of that species, which can best be determined after the 

 discovery of the male. From cressoni and pasadenae it may 

 be distinguished by its much larger size, from elliptica by its 

 wholly dark clypeus and broader face marks, from mesillac, 

 ziziae, dunningi, sayi, iUinoiensis, etc., by the wholly black 

 collar. 



Prosopis excavata n. sp 



$ . Length 4 mm. Face marks yellow, rather long and narrow, ex- 

 tending from base of mandible well beyond level of insertion of anten- 



