HYMENOPTERA 213 



dominal segments 2 and 3 yellow or yellowish-white ; palpi and an 

 annulus of the hind tibias before the middle, white ; coxae, hind tro- 

 chanters, apices of hind femora, their tibioB, except the white annulus, 

 and their tarsi black. Wings hyaline, the stigma and veins brown, 

 the disco-cubital nervure broken by a distinct stump of a vein, the 

 areolet complete. 



Type. — Cat. No. 5641, U. S. Nat. Museum. From Popof Island, 

 July II. Two specimens. 



Genus Monoblastus Hartig. 

 MONOBLASTUS NIGER sp. nov. 



Male. — Length 7 mm. Black; mandibles with a rufous spot near 

 the middle ; palpi, epitegulae and the subcostal vein, yellowish ; apices 

 of all femora and all tibiai and tarsi, except the last three joints of the 

 middle and hind tarsi, testaceous, the terminal joints mentioned being 

 more or less fuscous, especially above. Wings hyaline, the stigma, 

 except at base, and the veins dark brown ; the disco-cubital vein is 

 strongly curved, but has a short stump of a vein at its basal third. 

 The head in front is closely confluently punctate, behind and on vertex 

 it is smooth and shining, although sparsely punctate. The thorax 

 above is sparsely but distinctly punctate, the metathorax rugulose, 

 opaque, except the surface within the basal lateral areas which is 

 smooth and shining. 



Type. — Cat, No. 5642, U. S. Nat. Museum. From Popof Island, 

 July 9. One specimen. 



Genus Polyblastus Forster. 

 POLYBLASTUS GLACIALIS sp. nov. 

 Female. — Length 8 mm. Black ; anterior half of clypeus, dorsal 

 abdominal segments 2, 3 and 4, and the legs, except as hereafter 

 noted, rufous ; all coxaa and trochanters, the hind femora and their 

 tibias at apex black, the hind tibiae basally and their tarsi more or less 

 yellowish, the tarsal joints at apex being fuscous ; tegulae dark piceous ; 

 the epitegulae, subcostal vein, base of stigma and palpi, yellowish- 

 white, the rest of the stigma and the internal veins brown. The face 

 is finely, closely punctate, the basal half of the clypeus shining, with 

 some coarse punctures ; the thorax above is shining, although sparsely 

 minutely punctate ; the metathorax is rugulose, the carinas strong, but 

 with the basal middle and middle lateral areas confluent ; while the 

 first segment of the abdomen is rugulose with two dorsal carinas that 

 extend four-fiftbs its length. 



Proc. Wash. Acad. Sci., May, 1902. 



