144 HYMENOPTERA. 



Habitat. —Ssinta. Clara County, Calif, (coll. C. F. Baker). 

 Type locality only one known for the species. 



This is a peculiar species in many respects ; resembling in 

 face marks the males of P. coloradensis, but face much less 

 broadened, and lateral marks not extending up along eye 

 margin above insertion of antennae, and not so broad. The 

 upper portions of the marks are not clear cut and in a series 

 will probably prove somewhat variable, altho in the speci- 

 mens known they are alike. Similarly the thoracic markings, 

 not being conspicuous, will probably be variable. In char- 

 acters of the male genitalia this species shows no close rela- 

 tionship to any others ; the armature in the broad superior 

 lobe of the stipes resembles P. orssonj, but is otherwise quite 

 different ; in ventral plates it stands alone in having these 

 completely nude, altho the general shape of the seventh ven- 

 tral plate is quite like that of P. cressoni, but without any 

 tooth-like projections. The eighth ventral plate differs strik- 

 ingly from all others in the form and position of the apical 

 lobes. Owing to the delicate membranes of the seventh ven- 

 tral plate its exact structure is difficult to determine, and the 

 accompanying figure may be somewhat incorrect in details, 

 but the general form and appearance is unmistakable 



PROSOPIS WOOTONI Ckll. 1896. 



1896. P. wootoni, Ckll. Psyche Supp. 7: 26. 



\%^. P. divergens,Q,)^\\. Pysche Supp. 7:29. 



1898. P. wootojti, Ckll. Ent., 1898, p. 217. 



\mi. P. divergens,'Lov. Ent. News. 12:8. 



1903. P. clandestinus, Vier. Insects, Beulah, N. M. 



1904. P. divergens, Vier. Can. Ent. 36:93. 



1906. P. divergens, Ckll. Bull. Amer. Mus. Nat. Hist. 22:423. 

 1910. P. excavata, (female), Swk. and Ckll. Ent. News. 21:70. 



Male. — Small ; distinguished by short, tapering lateral marks ; and 

 broad base of clypeus, which is about the same width as lateral marks 

 at that level. 



Length about 5 mm. Scape short, heavy, entirely dark, flattened, 

 slightly concave behind. 



Sculpture. — Front, vertex and occiput densely, confluently punc- 

 tured ; punctures as in asininus but not so pit-like. Punctures of 

 thorax similar in general to that of P. coloradensis, but pleura quite 

 sparsely punctured and pits of propodeum small, resembling rugae. 



