HENRY J. FRANKLIN. 469 



and Twin Mountain), Vermont, New York (Ithaca), Massa- 

 chusetts, Connecticut, Pennsylvania, Virginia and Minnesota. 

 It is mainly a Transition species. Further collecting will 

 probably extend its recorded habitat. It is probably present 

 in most of the Transition Zone territory between the province 

 of Saskatchewan and New York. 



The female of this species is most closely related to lati- 

 tarsus Morrill, but the lateral carinae of the hypopygium are 

 less elevated than are those of that species. The male has 

 its closest ally in suckleyi, as is shown both by its coloration 

 and by its every structure (including the genitalia), but it may 

 be conveniently separated from that species by means of the 

 different coloration of its second dorsal abdominal segment. 



Psithyrus latitarsus Morrill. 

 Psithyrus latitarsus Morrill, Can. Ent., XXXV, 1903, p. 224 (with fig- 

 ures showing distinguishing structures). 

 Swenk, Ent. News, XVIII, July, 1907, p. 297. 



Types. — Type from Bozeman, Montana, deposited in col- 

 lection of Massachusetts Agricultural College ; cotypes at 

 Massachusetts Agricultural College, " U. S. Nat. Museum 

 and Montana Agricultural College." 



Head mostly black. Dorsum of thorax: yellow, but usually with a dis' 

 tinct black band between the bases of the wings ; pleura yellow to the 

 bases of the legs. Dorsum, of abdomen with segtnent one usually having 

 a slight touch of yellow on its anterior corners, but often entirely dark ; 

 segment two dark ; segment three dark, but usually with yellow pile on 

 its posterior corners ; segm,ent four dark in the tniddle and yellow on the 

 sides ; segmetit five dark, but usually yellow on the extreme sides ; seg- 

 ment six, venter and legs dark. Malar space m,edium. Hind meta- 

 tarsi broad. Lateral elevations of hypopygium very prominetit. 



Female. Head. — Often entirely dark ; the occiput usually with a 

 faint sprinkling of yellow hairs. Mandibles (fig. 49) usually with their 

 biting margin slightly notched in the middle. Malar space shorter 

 than its width at the apex, about one-fifth as long as the eye. Cly- 

 peus, for the most part, densely and coarsely punctate. Flagellum of 

 antenna about one and three-fourths times as long as the scape ; the 

 third antennal segment longer than the fifth, the fifth longer than the 

 fourth. 



Thorax. — Dorsum yellow, usually with a distinct, but rather poorly 

 defined, black band between the bases of the wings, this band occa- 



TRANS. AM. ENT. SOC, XXXVIII. 



