[193] HYMENOPTERA 199 



what squarely and abruptly truncate posteriorly, the truncature being 

 encircled by a delicate carina. The abdomen in the female is oblong- 

 oval, about thrice the width of the thorax ; above it is highly convex, 

 beneath flat, the ovipositor being short, hardly the length of the petiole, 

 dorsal segments 2 to 4 subequal, the second not or scarcely shorter than 

 the petiole. In the male the abdomen is much narrower, scarcely twice 

 as wide as the thorax, with large broad, dark rufous claspers ; other- 

 wise hardly distinguishable from the female. 



Type. Cat. No. 4015, U. S. Nat. Museum. From St. Paul 

 Island, Pribilof Islands (Fur Seal Commission). 81 specimens repre- 

 senting both sexes. 



PEZOMACHUS OBESUS sp. nov. 



Female. Length 3.5 mm. Black and shining; mandibles and legs, 

 including coxae, uniformly pale ferruginous or brownish-yellow ; flagel- 

 lum light brown, the pedicel and an annulus at base of first joint, pale 

 yellowish. The head is large, quadrate, shining, the temples full, as 

 wide as the eyes; antennae 19- jointed, about two thirds the length of 

 the body ; the thorax constricted a little beyond the middle, its anterior 

 lobe being distinctly the longer, the scutellum entirely wanting, the 

 metathorax obliquely truncate posteriorly, the truncature surrounded 

 by a delicate carina, while its disk above has a small central fovea or 

 impression. The abdomen is large, swollen, oblong, oval ; across its 

 widest part it is fully thrice the width of the thorax, dorsal segments 

 2 and 3 subequal, 4 and 5 shorter ; ovipositor short, not longer than the 

 petiole. 



Type. Cat. No. 5609, U. S. Nat. Museum. From St. Paul Island 

 (Fur Seal Commission). 



PEZOMACHUS ALASKENSIS Ashmead. 



Pezomachus alaskensis ASHMEAD, Proc. U. S. Nat. Mus., xn, p. 421, ?, 1890. 

 Type. Cat. No. 2052, U. S. Nat. Museum. From Nushagak River 

 (Chas. W. McKay). 



Tribe CRYPTINI. 

 Genus Cryptoideus Ashmead. 



CRYPTOIDEUS SITKENSIS sp. nov. 



Female. Length 10 mm. ; ovipositor two-thirds the length of the 

 abdomen. Ferruginous with the head and the sutures of the thorax 

 black; antennae blackish toward apex, the first three joints of the 



