AMERICAN COLEOPTERA. 137 



lasts until the eud of June. It is missing for about two months 

 and reappears early in September to remain through the fall. In 

 Connecticut Mr. Harris finds generosa in July and August. 



Var. manitoba n. var. 

 Length 15-18 mm.=.60-.72 inch. 



I have received from Mr. Norman Criddle, of Aweine, Manitoba, 

 a most interesting series of this variety. The extreme form is 

 figured in which the white markings are so broad that more than 

 half the elytra is white. From this form gradations occur nearly to 

 the most broadly marked forms of generom we have in the east. 

 The middle band in some specimens loses the characteristic deflec- 

 tion of generosa in great measure, and more closely approaches the 

 form of formosa, and this combined with the narrow markings is 

 shown on plate III. 



The color is usually dull brown bronze, but in one specimen it 

 becomes nearly as bright cupreous as in formosa. With these speci- 

 mens Mr. Criddle takes venusta, and there is no indication of this 

 species running into generosa or manitoba. It is a consideration of 

 the intermediate specimens which prevents me regarding manitoba 

 as a distinct species, but the uniformly wider white margin and the 

 locality indicate that it is a geographical variety intermediate be- 

 tween generosa and formosa. I have one specimen from northern 

 Illinois, in which the characters of manitoba are in some respects 

 copied, but even in this the width of the apical lunule is much less. 

 This variety is very hairy; above, the vertex (as well as the front) 

 and the thorax are quite thickly clothed ; beneath, the sides of the 

 head, the flanks of the thorax, the sides of the abdomen are thickly 

 clothed and the long white hairs on the cox?e and legs are dense and 

 conspicuous. It is even more hairy than typical generosa, with 

 which it agrees except as noted. 



Habitat. — Aweme, Manitoba. 



C venusta Lee. 1848, Ann. Lye. iv, 179, pi. 13, fig. 5; Schaupp, I.e., p. 91, pi. 

 2, fig. 51. 

 Length 12-15 mm.=.48-.60 inch. 



Habitat.— 'N. Mex., Kan., Neb , Colo., Dak., Mont., Manitoba. 



Cupreous, opaque, rarely slightly shining, margins shining; be- 

 neath brilliant green ; elytral markings consist of oblique humeral 

 lunule, almost reaching the middle band, a middle band rectangu- 



TRANS. AM. ENT. SOC, XXVIII. (18) MAY, 1902. 



