472 AMERICAN HYMENOPTERA. 



with a strong admixture of dark hairs, especially in the middle, and 

 with a black touch on each anterior corner ; segment four mostly yel- 

 low ; segment five more or less black in the middle, with yellow pile 

 on the sides ; segment six black in the middle and yellow on the ex- 

 treme sides ; segment seven black. Venter usually with a large amount 

 of yellow pile, especially on the sides ; the apex of the last segment 

 bearing ferruginous pubescence. 



Genitalia. — Outer and inner spathae much like those of ashtoni (figs. 

 60 and 141). Claspers (figs. 91 and 96) much like those of ashtoni, 

 but with the margin on the inner side of the apex of each squama less 

 strongly incurved than in that species ; sagitta much like that of 

 ashtoni, but not with so sharp an indentation on its outer side between 

 the head and the shaft (it does usually, however, have a sharper 

 indentation than that shown in fig. 96). 



Wings. — Somewhat stained with brown, almost subhyaline. 



Legs. — Mostly dark ; the tarsi often with considerable, and the tibiae 

 sometimes with more or less, ferruginous hair. 



Dimensions . — Length, 13 mm. to 14 mm. Spread of wings, about 32 

 mm. Width of abdomen at second segment, about 6j mm. 



Redescribed from thirteen specimens. 



Habitat. — I have records of this species as follows : British 

 Columbia (Kaslo, Duncans, Nelson and Mt. Cheam), Alberta 

 (St. Albert — one male), Montana (Missoula and Gallatin 

 County), Idaho (Moscow and Beaver Canon), Utah (Bea- 

 ver Range Mountains — 8,000 to 10,000 feet altitude) and 

 California (Santa Clara County). It is probably also present 

 in Washington, Oregon and Wyoming and possibly in Colo- 

 rado. It seems to be mainly a Boreal species. 



This species can, as a rule, be readily separated from the 

 male of ashtoni by means of the yellow pile on the middle of 

 its second dorsal abdominal segment. It does not vary very 

 much, as does the ashtoni vsxsCio,., in the coloration of its pleura 

 and scutellum. 



This species does not seem to agree very well with 

 Greene's original description of suckleyi^ but it does agree 

 with Cresson's description of what was apparently Greene's 

 type specimen, and, on the basis of Cresson's remarks in 

 regard to the matter (Proc. Ent. Soc. Phila., II, 1863, pp. 

 113 and 114) I adopt the name suckleyi for this species. 



