[239] HYMENOPTERA 245 



hind femora dusky, tips of hind tibiae and tarsi fuscous. Wings hya- 

 line, the stigma and veins brown. Antennae 32-jointed, the first joint 

 of the flagelhim the longest, nearly as long as joints 2 and 3 united. 



Tyfe. — Cat. No. 5689, U. S. Nat. Museum. From Kukak Bay, 

 July 4. One specimen. 



MESOCHORUS ORC^ sp. nov. 



Male. — Length 4 mm. Polished black except as follows : The face 

 below the antennae, clypeus, cheeks, mandibles, scape and pedicel, 

 prothorax, a band on the mesopleura below., front coxae and trochan- 

 ters, middle trochanters, ventral fold, the apex of the second dorsal 

 abdominal segment connected with a triangular median spot and a 

 median stripe on dorsal segments 3 and 4, pale yellowish or yellowish- 

 white ; legs, except as noted, reddish-yellow. Wings hyaline, the 

 stigma yellowish-white, the costae and internal veins brown. 



Type. — Cat. No. 5690, U. S. Nat, Museum. From Orca, June 

 27. Two specimens. 



MESOCHORUS FRONTALIS Ashmead. 

 Mesochorus frontalis PiSnuKAD, Fur Seals and Fur Seallsl. , iv, p. 336, (^, 1899. 

 Type. — Cat. No. 4037, U. S. Nat. Museum. From Bering Island 

 (Mr. Barrett-Hamilton) ; Pribilof Islands (Fur Seal Commission). 



Tribe PORIZONINI. 



Genus Istirgus Forster. 



ISURGUS ALASKENSIS sp. nov. 



Female. — Length 2.8 mm. ; ovipositor longer than the abdomen. 

 Black ; mandibles and legs, except the coxae, more or less of the tro- 

 chanters and the hind legs almost entirely, rufous ; hind legs sometimes 

 wholly rufous. 



Head, except cheeks and temples, opaque, finely coriaceous ; thorax, 

 except the parapsidal furrows and a quadrate depressed space on the 

 mesonotum posteriorly, which are coriaceous and opaque, shining, the 

 meta thorax short and shining, although feebly wrinkled, the apical 

 transverse carina distinct and connected with two close parallel carinae 

 on the middle of the metanotum. Wings hyaline, the stigma and 

 veins brown. 



Abdomen longly petiolate, the body compressed, sniooth and shining. 



Type. — Cat. No. 5691, U. S. Nat. Museum. From Popof Island, 

 July 9, 12. Two specimens. 



