OF NORTH AMERICA. 151 



the dark color of the patch on the inner margin of the primaries. On 

 the secondaries, the marginal band is continued to the costa, instead 

 of dying out before the apex ; and on the under surface the marginal 

 bands reappear, which is not the case in E. grata. 



3— EUDRYAS BREVIPENNIS. N. S. (PI 7, figs. 3, 4.) 



The figures of this species are only approximate. The type and 

 only specimen known to me is badly rubbed, and somewhat muti- 

 lated, having lost its head, so that the exact nature of the latter and the 

 details of the coloration ot the marginal bands cannot be acciiraklv 

 figured or described, but it presents strong structural differences which 

 clearly separate it from its Eastern congeners, and it was deemed best 

 to insert it to call attention to the wide geographical range of the genus. 

 It presents a combination of the characters of both E. grata and E. 

 unio, though more similar to the latter, in having the same alar ex- 

 panse, and in the presence of the marginal band on the wings beneath. 



The insect is much broader in proportion to the expanse of the wings, 

 the secondaries being much more rounded, than either of the species 

 mentioned. When the wings are " set" so that the discal dot of the 

 secondaries just touches the inner margin of the primaries, the pro- 

 portions are as follows : 



Alar expanse, - - grata 1.75. wiio 1.40 hrevipennis 1.40 

 Length of body, - - "0.70. " 0.60 " 0.70 



Breadth of wings, - " 0.60. " 0.52 " 0.58 



It will thus be seen that with an alar expanse only equal to that of 

 E. unio, the breadth of the wings from the costa of the primaries to 

 the outer margin of the secondaries is nearly as great as that of E. 

 grata, while the length of the body equals that of the latter species. 

 This results from the following differences in the shape of the wings. 

 The outer margin of the primaries is more strongly angulated, making 

 the apex more rectangular, while the outer margin of the secondaries 

 instead of being parallel with the costa is strongly rounded. In color- 

 ation the insect more nearly approaches E. unio than E. grata, though 

 the abdomen is more like that of the latter species, being yellow with 

 the dark, almost black tufts, extending to the tip, while there is a dis- 

 tinct lateral row of black spots. There is the same blackish spot 

 connected with the marginal band on the primaries, and the marginal 

 band reproduced on all the wings beneath, as in E. unio, but there is 



