240 



ASHMEAD 



Tribe PLECTISCINL 

 Catastenus Forster. 

 CATASTENUS ALASKENSIS sp. nov. 



Female. — Length 3.5 to 4 mm. ; ovipositor not longer than the peti- 

 ole. Polished black, except the metathorax which is "wrinkled and 

 completely areolated, the first and second segments of the abdomen 

 which are coriaceous and opaque and the third segment at base which 

 is feebly sculptured ; palpi yellowish ; legs, except hind coxae, rufous, 

 the hind femora more or less dusky ; abdomen with the apex of the 

 second dorsal segment, the third entirely and the apex of the fourth, 

 testaceous or yellowish ; sometimes the apex of the fifth segment is 

 yellowish. 



The antennae are 22-jointed, brown, and slightly and gradually 

 thickened toward apex. Wings hyaline, the stigma and veins brown. 



Male. — Agrees well with the female, except that the antennas are 

 24-jointed, filiform and brown-black, the middle and hind coxae are 

 black, the hind femora brown-black, their tibias and tarsi subfuscous. 

 while the abdomen has the apices of the segments yellow. 



Tyfe. — Cat. No. 5692, U. S. Nat. Museum. From St. Paul 

 Island, July 10, 17. 



CATASTENUS TRIFASCIATUS Ashmead. 



Catastentis trifasciatus Ashmead, Fur Seals and Fur Seal Isl., iv, p. 336, 

 1899. 



Type. — Cat. No. 4038, U. S. Nat. Museum. From Bering Island 

 (Dr. L. Stejneger) ; St. Paul Island (Fur Seal Commission). 



Genus Plectiscus Gravenhorst. 

 PLECTISCUS ORC^ sp. nov. 

 Female. — Length 3 mm. Polished black ; clypeus, scape and pedicel 

 beneath, the ring-joint, mandibles, palpi, tegulae, prosternum, the lower 

 margin of the prothorax, legs entirely, the ventral fold, and the apices 

 of dorsal abdominal segments 2 and 3 and base of third narrowly, pale 

 yellowish. Wings hyaline, the stigma and veins brown. Antennae 21- 

 jointed, the flagellum brown. Metathorax with a strong transverse 

 carina and with lateral carinas, the areola oblong-quadrate. Abdomen, 

 except the petiole and the second segment at base, highly polished, 

 impunctate, the petiole more than thrice longer than thick, opaque and 

 strongly coriaceous, the second segment at base feebly sculptured. 



