2l6 ASHMEAD [ 2I ] 



Type. Cat. No. 5635, U. S. Nat. Museum. From Popof Island, 

 July 4. One specimen. 



Genus Mesoleptus Gravenhorst. 

 MESOLEPTUS UNALASK^E sp. nov. 



Female. Length 7 mm. Black ; face below antennas, except a 

 median black line, connected with a triangular black spot just above 

 the clypeus, the cheeks, clypeus, mandibles, except teeth and a spot at 

 base, the palpi, scape and pedicel beneath, tegulce, epitegulas, sutures 

 of trochanters and the second joint of same, tibial spurs, venter and 

 the extreme apices of dorsal abdominal segments 2 and 3 (nearly in- 

 visible unless viewed from behind) yellowish-white ; flagellum beneath 

 ferruginous ; all coxse and first joint of trochanters, at least above, 

 black ; rest of legs red. Wings hyaline, the stigma and subcostal vein 

 yellowish, the internal veins brown. 



Type. Cat. No. 5636, U. S. Nat. Museum. From Unalaska, Au- 

 gust 24 (Fur Seal Commission). 



Tribe CTENISCINI. 

 Genus Microplectron Forster. 



MICROPLECTRON ALASKENSIS sp. nov. 



Male. Length 3.6 mm. Black, the face, except a broad median 

 line extending to the clypeus, clypeus, mandibles, scape and pedicel 

 beneath, and apical median blotches on dorsal abdominal segments 2, 

 3 and 4, as well as the extreme apices of the following segments, 

 lemon-yellow ; palpi, tegulse, apices of front and middle coxae and be- 

 neath, their trochanters and the hind trochanters yellowish-white; 

 front and middle coxa? basally and the hind coxas black ; rest of legs 

 mostly rufous, the hind femora, tibiae and tarsi brownish or sub- 

 fuscous. Wings hyaline, the stigma and veins brown, the poststigmal 

 vein and subcostal veins, as well as the parastigma and the veins in 

 the hind wings, pale yellowish. 



Type. Cat. No. 5637, U. S. Nat. Museum. From Popof Island, 

 July 9. One specimen. 



Genus Cteniscus Haliday. 



TABLE OF SPECIES. 



I. Thorax and the head, at least above, black 2. 



Thorax not black 5. 



