102 THE CANADIAN KNTOMOLOGIST. 



Male. — Slightly smaller than the female. Pubescence white all over. 

 No median yellow line on the clypens, and the lateral marks are smaller 

 than in the female. These are connected with each other by a yellow line 

 along the apical border of the clypeus. The lateral face marks are small, 

 the yellow line on the scape is inconspicuous or nearly absent, and the 

 same is true of the yellow line on the prothorax. No yellow on tubercles. 

 Legs coloured as in the female. Yellow of the abdomen confined to a 

 small lateral spot on each side of the second segment, situated on the 

 margin, and similar, exceedingly small spots on the margins of the third 

 segment, and rarely of the first as well. Pygidium reddish yellow. 



Types : Mouth of Yellow River, Burnett Co., Wis., July 28-31. 1909. 

 (Nos. 31730 and 31731.) 



Paratypes : One male, mouth of Yellow River, July 28-31, 1909; 

 four males and two females. Kettle River Rapids, Aug. 4, 1909, and one 

 male, Randall, Aug. 5, 1909, all of these localties in Burnett Co. along the 

 St. Croix River. Specimens in the collection of the Milw. Publ. Museum. 

 They were taken on the flowers of Rudbeckia hirta and Heliaiithus 

 occidentalis. This species is distinct from P. albipennis Cr., and P. 

 ladeipennis Swenk & Cockerell, one of its main characters being dark legs 

 with a trace of yellow around the knees only. 



Perdiia macu/ipe?ints, n. sp. 



Female. — Length 6 to 7 mm. Head and thorax dark green, legs and 

 abdomen brownish-black with yellow markings. Body clothed with white 

 pubescence, longest on legs and tip of abdomen. Wings white, with a 

 conspicuous black dot in the stigma. 



Head broader than long. Flagellum black above, reddish-yellow 

 below. Scape light yellow in front. Clypeus yellow with two longitudinal 

 black bars, not reaching the apex. Lateral yellow face-marks triangular, 

 running halfway up the face. Apex of triangle rounded or truncate, the 

 base often emarginate. These face-marks are very variable ; in one speci- 

 men on one side of the face a division into two small spots is noticeable. 

 Mandibles yellow, with reddish tips. Tubercles, tegula? and two spots on 

 prothorax yellow. The melalhorax has a more bluish tinge than the rest 

 of the thorax. Abdomen with two yellow spots on the first and interrupted 

 yellow cross bands on the anterior half of the second, third, and fourth 

 segments. The spots on the first segment may be absent, and the bands 

 on the remaining segments may be so widely interrupted as to form small 

 spots only. Pygidium reddish. In front and middle legs, tips of femora, 



