244 ASHMEAD [238] 



the eye margin, as in that species. The thorax and abdomen are pale 

 honey-yellow ; a stripe on sides of prosternum, the lateral margins of 

 the mesonotum, and a stripe on the parapsidal furrows behind, are yel- 

 lowish-white ; the apical transverse carina is indicated only laterally, 

 being wholly obliterated medially, the surface of the metanotum before 

 it being very finely, transversely aciculate, behind it polished and im- 

 punctate. Wings hyaline, the venation as in P. geminatus^ the costal 

 vein and the stigma yellow, the subcostal vein and the internal veins 

 being brown or brown black. External claspers similar to those in 

 P. geminatus but slightly narrower. 



Type. — Cat. No. 5688, U. S. Nat. Museum. From Kukak Bay, 

 July 4. Five specimens. 



Tribe ME SO CHOP INI. 

 Genus Mesochorus Gravenhorst. 



The three species belonging to this genus, found in Alaska, may 

 be tabulated as follows : 



1 . Polished black. 



All coxae and legs pale yellowish or reddish-yellow 2. 



All coxae mostly black, the front and middle coxae usually pale 



at apex. 



Legs honey-yellow, the apical two thirds of hind femora and the tips 



of their tibiae fuscous ; cheeks, clypeus anteriorly and the extreme 



apex of second dorsal segment of abdomen pale yellowish. Female. 



M. kincaidi. 



2. Face, clypeus, cheeks and lower part of temples yellowish- white. 



Prothorax pale yellowish ; abdomen black, with the apex of the second 

 dorsal segment connected with a triangular median spot, a median 

 line on the third and continued on to the fourth, pale yellowish. 

 Male M. orccs. 



Prothorax, except its sternum, black ; abdomen black, with the venter 

 and second dorsal suture white. Male M. frontalis. 



MESOCHORUS KINCAIDI sp. nov. 

 Pemale. — Length 3 mm. Polished black ; cheeks, anterior margin 

 of the clypeus and the mandibles flavo-testaceous ; pedicel and flagel- 

 lum brown, the latter darker towards apex; palpi, tegulae, ventral 

 fold, the narrow membranous margins of dorsal abdominal segments 

 I and 2, and the extreme apex of dorsal segment 2 yellowish-white; 

 legs, except the middle and hind coxae, apex of hind tibiae, and tips of 

 the joints of hind tarsi honey-yellow ; middle and hind coxae black, the 



