HYMENOPTERA I93 



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. 



FEZOMACHUS 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 ; antennce 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). 



FEZOMACHUS ALASKENSIS Ashmead. 

 Pezomachics alaskensis Ashmead, Proc. U. S. Nat. Mus., xii, p. 421, ?, 1890. 

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

 (Chas. W. McKay). 



Tribe CRTPTINI. 



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 



