NO. 2202. GIFFARD COLLECTION OF HYMENOPTERA—ROinVER. 247 



of piopodeum with distinct carinas basally, which become so re- 

 duced posteriorly that there is a semicircuhir nearly unsculptured 

 area; posterior aspects of propodeum punctato-striate; petiole con- 

 vex above, coarsely sculptured slightly longer than hind coxa and 

 femora or dilated part of first tergite; gaster polished; nervulus 

 slightly antefurcal; second recurrent slightly antefucal; second 

 cubital narrowed by a fifth below. Black sparsely clothed with 

 long white hair; wings hyaline, dusky apically; ventation dark 

 brown. 



Type-localitrj. — Alameda County, California. Described from one 

 female collected July, 1907, by W. M. Giffard. 



Type.— C^i. No. 20129, U.S.N.M. 



STIGMUS FULVIPES FULVIPES Fox. 



One female and four males from the foothills near Santa Barbara, 

 Jime, 1907. 



STIGMUS FULVIPES COQUILLETTI Rohwer. 



One female from Alameda County, California, collected July, 

 1907. 



DIPLECTRON BIDENTATUS Ashmead. ' 



One male from Alameda County, collected July, 1907. 



This differs from Ashmead's type, which is a male (not female), 

 in that the white mark on the side of the face is larger and the scape 

 is pale beneath. This is new to California. 



SILAON AFFINIS (Roh^rer). 



One female from Alameda County, collected July, 1907. 

 This is slightly smaller than the type, the mandibles are ferrugi- 

 nous, and the anterior tibiae have a pale spot exteriorly. 



SILAON MAJOR, new species. 



May be readily separated from the other American species of this 

 genus by its large size, dark legs, and by the striation of the propo- 

 deum. 



Female. — Length, 10 mm. Anterior margin of the clypeus ob- 

 tusely, triangularly produced and with eight or nine strong, short 

 spines; frontal carina strong, extending from the apex of the 

 clypeus dividing a short distance above the antennae becoming sub- 

 parallel and then sharply diverging to the inner margins of the eyes 

 which it approximates and parallels from the anterior ocellus to the 

 line drawn tangent to the posterior ocelli; head opaque, with fine, 

 close punctures; ocelli in acute triangle; the ocellocular line sub-' 



