68 ENTOMOLOGICAL NEWS. [Feb., 'lO 



This species differs from P. cressoni Ckll. [ = : pygmaea 

 Cress.], specimens of which were taken at the same time as the 

 unique type, principally in its much longer antennae, black 

 tubercles and entirely different face marks. It is very similar 

 to P. digitata fedorica Ckll., 1909, but differs in the larger up- 

 ward process of the lateral face marks, with no basal angles 

 at junction, with lateral marks, longer supraclypeal mark and 

 larger, much paler antennae. 



Prosopis magniclavis n. sp. 



$ . Length, 4.5 mm. Very closely related to P. cressoni Ckll, but 

 differing as follows : Upward extension of lateral face marks clavate, 

 terminating in a large knob which curves around antennae ; whole of 

 front of scape yellow, or nearly so ; face distinctly longer and narrower 

 and more converging below ; supraclypeal mark longer, twice as long 

 as wide, the subquadrate portion distinctly longer than basal width ; 

 hind tibiae with only a broad dark ring on apical half. 



9 . Length 5 mm. Differs from 9 of cressoni as follows : Collar 

 always with yellow marks ; face rather longer and narrower, clypeus 

 more produced ; hind metatarsus more or less yellow basally, not all 

 dark; abdominal segments 3-6 more hairy, usually bearing abundant 

 short pale pile ; enclosure less rugose. 



Types. Bad Lands, Sioux County, Nebraska, August 10, 

 1908, on Solidago (R. W. Dawson). Collection University of 

 Nebraska. 



Paratypes. Type lot, i male and 6 females : Glen, Sioux 

 County, Nebraska, August 13, 1906, on Cleome serrulata (M. 

 H. Swenk), i male and I female; Crawford, Sioux County, 

 Nebraska, July 28, 1901, on Mentselia nuda (M. Cary), i male 

 and i female. 



The male of this species resembles P. bakeri Ckll. in the 

 heavily clavate face mark extensions and yellow scape in front, 

 but that species has the upward extensions much constricted 

 at their junction with the face marks, meeting them at a con- 

 spicuous angle and away from the orbit. The female is ex- 

 ceedingly like the same sex of P. mesillae Ckll., indeed practi- 

 cally indistinguishable from it, but the male is distinct from the 

 male of P. mesillae. In P. mesillae the upward extension of 

 the lateral marks resembles the end of a finger, and is not 

 clavate. 



