226 ASHMEAD 



Genus Enizemum Forster. 

 ENIZEMUM TIBIALE (Cresson). 



Bassus tibialis Cresson, Trans. Am. Ent. Soc, ii, p. no, ?, 1868. — Cresson, 



Syn. Hym. North Am., p. 214, 1887. 

 Enizemum tibiale Davis, Trans. Am. Ent. Soc, xxii, p. 27, 9d^. 1895. 



Type in collection of the American Entomological Society. From 



St. Paul Island (Fur Seal Commission). Occurs also in Canada, 



Montana, Colorado, Kansas and Illinois. 



Genus Homotropus Forster. 

 HOMOTROPUS ALASKENSIS sp. nov. 



Female. — Length 5.5 mm. Black; a spot just above clypeus, the 

 clypeus, mandibles, scape and pedicel beneath, a band on each side of 

 the mesonotum, a spot in front of tegulae and a line beneath, most of 

 the coxae and trochanters, the venter, and the second and third dorsal 

 sutures of abdomen more or less lemon-yellow ; basal half of hind 

 coxae and the front and middle coxae basally, black ; remainder of legs 

 mostly ferruginous, the front and middle femora and tibiee more or less 

 streaked with yellow, the basal joints of trochanters and all femora at 

 base beneath fuscous. Wings hyaline, the stigma, except along the 

 outer margin, yellowish, costse and internal veins brownish. Abdomen, 

 except the first and second segments and the base of the third, smooth 

 and shining ; first and second segments rugulose, the first the more 

 coarsely, the third feebly sculptured at base only. 



Type. — Cat. No. 5669, U. S. Nat. Museum. From Popof Island, 

 July 10, 14. Five specimens. 



Tribe ORTHOCENTRINI. 



Genus Synoplus Forster. 



SYNOPLUS BREVIPENNIS sp. nov. 



(PI. XI, fig. 2.) 



Female. — Length 2.5 mm. Polished black; mandibles rufous; 

 palpi pale fuscous, the last joint sometimes darker ; legs ferruginous, 

 the femora and hind coxae usually, but not always, obfuscated, the 

 trochanters and tibial spurs pale yellowish. 



Antennae 21 -jointed, usually light brownish with the scape and 

 terminal joints darker or fuscous ; the first joint of the flagellum is 

 the longest, a little longer than the second, or about 2]/^ times as long 

 as thick at apex, the following joints to the seventh very imperceptibly 



