THE CANADIAN ENTOMOLOGIST. 225 



propodceum. Wings subhyaline, smoky brown, nervures brown. Legs, 

 except tarsi, clothed with black and brownish-black pubescence. First 

 tarsal segments clothed with brownish-black, except inner sides and tips, 

 which with the four following tarsal segments are clothed with brownish- 

 yellow pubescence, darkest on inner side of first tarsal segments. Length 

 of metatarsus about two and one-half times its greatest width, posterior 

 edge strongly arcuated. 



Dorsal surface of abdomen : Clothing sparse and short ; black and 

 pale lemon-yellow, the hair of the former colour usually tipped with brown- 

 ish or yellowish, more noticeable on posterior margins of the segments. 

 Pubescence on first segment black, sometimes mixed with yellow on the 

 sides ; on second segment black ; on third segment black, with more or 

 less yellow on sides posteriorly ; on fourth segment entirely yellow, except 

 for a patch of black on middle of basal half, which may or may not extend 

 in a point to apex of segment ; on fifth segment black except extreme 

 sides, which are yellow ; terminal segment naked except for a very fine 

 brownish velvet-like pubescence below and on sides above ventral sur- 

 face of abdomen ; segments one to five have an apical fringe of black 

 hairs. 'From each side of apical segment below arises an angular, keel-like 

 process, which is directed outwards and downwards^ the two converging 

 posteriorly, becoming less pronounced, and disappear near the tip of the 

 segment. From above these keel-like processes can be plainly seen 

 extending outwardly from the sides of the apical segment. 



Described from nine $ specimens from Prof. R. A. Cooley, taken at 

 Gallatin Co., and Bozeman, Montana. Type deposited in collection of 

 Mass. Agric. College. Co-types at Mass. Agric. College, U. S. Nat. 

 Museum, and at Montana Agric. College. 



This species in colour, general form and size resembles P. {usu/aris, 

 Smith ; but the two cannot be even closely related, as will be seen from 

 the following partial description of the latter species : 



Malar space about one-third length of eye. A tuft of yellow on head 

 just above insertion of antenna?, another on vertex, and sometimes a very 

 small one between insertion of antennae — all fringed with black. Meta- 

 tarsus about three times as long as its greatest breadth, posterior margin 

 nearly straight. Apical segment of abdomen below with a simple rounded 

 swelling on each side, not projecting enough to be noticed from above. 



I have examined thirteen ^ specimens of P. insularis from Montana 

 and one from New Hampshire (Durham.), all of which agree with Smith's 



