52 THE CANADIAN ENTOMOLOGIST 



various forms of flowers, and Prof. Cockerell's paper referred to 

 above is full of details on this particular subject. 



At the time of its publication only two out of a total of seventy- 

 one species were known to inhabit the States east of the Mississippi 

 River, viz., P. octcmacalaia (Say.), a northern species, ranging 

 according to the records then on hand from Illinois to New Hamp- 

 shire, and P. obscurata Cr., a southern species, occurring in Georgia 

 and Florida. None had been reported from Wisconsin. Our 

 present knowledge brings the number of eastern species up to 

 twelve, the following six of which belong to the Wisconsin fauna: 

 pallidipennis Graen., bruneri Ckll., maura Ckll., maculipennis 

 Gra?n., cilrinella Graen., and gerhardi Vier. 



P. pallidipennis Graenicher. This was described- from 

 specimens taken in Burnett Co., Wis., at various places on the 

 St. Croix River, a tributary of the Mississippi, which forms through- 

 out the greater part of its course the boundary between Wisconsin 

 and Minnesota. It has since been found at a number of points on 

 the Mississippi River as far down as Rutledge in the southwestern 

 corner of Wisconsin. I have also come across this species in the 

 Waukegan-Kenosha dune region along Lake Michigan in north- 

 eastern Illinois and southeastern Wisconsin. Like the western P. 

 albipennis Cr., it favours the sunflower-type of Compositae, and 

 has been observed gathering pollen from the sunflower Helianthv.s 

 occidentalis Riddell, Rudbeckia hirta L. (black-eyed Susan), and 

 Lepachys pinnata (Vent.) T. & G. (gray-headed cone-sunflower). 



In 1907 Professors M. H. Swenk and T. D. A. Cockerell 3 

 described P. lacteipennis, a species from Nebraska, taken most 

 frequently on the common sunflower Helianthns annuus L., and of 

 which they state that it "is quite close to albipennis but differs 

 at once in its larger size and in a reduction of the yellow markings." 

 Last year Mr. J. C. Crawford 4 described P. canadensis from 

 Medicine Hat, Alberta, Canada. This species forms together with 

 lacteipennis from Nebraska and pallidipennis from Wisconsin a 

 group of very closely related forms, all of which are to be con- 

 sidered recent offshoots of the sunflower visitor albipennis, or at 



2. Can. Ent., Vol. 42, pp. 101-104; 157-160 (1910). 



3. Ent. News, Vol. 18, pp. 51-58. 



4. Can. Ent., Vol. 44, p. 359-360 (1812). 



