15 



IIVDRIOMENA HENSUAVVI Swett. (PI. II, Fig. 9; PI. \'l, Fig. 12.) 



The species was unknown to us except for a photograph of the 



type from Nevada received through the kindness of Mr. S. Henshaw 



of the Cambridge Museum of Comp. Anatomy ; in the material sent by 



the American Museum, however, we found 



five specimens which we think are without 



much doubt this species; one S from the 



Sierra Nevadas. Calif, ex Hy. Edwards Coll. 



is very close to the figure of type before us ; 



1 (J and 1 9 from Estes Park, Colo. (June 



''"'■ ' 11, 18) agree structurally and except in a 



L'ncus of H. henshaivi . . ... , . ti .. 



few mnior points also in maculation ; another 

 9 from Hy. Edw. Coll. is simply labelled 'Colorado'. Unfortunately 

 the abdomen of the type specimen is lost so that we have been unable 

 to confirm our identification by comparing the structure of the Uncus ; 

 our figure, as well as our text figure of the Uncus, is that of a Placer 

 Co. Calif, specimen which is better marked than the type. The forks 

 of the Uncus are rather more U shaped than in the preceding species 

 but the long narrow neck shows its close relationship. In the 9 the 

 palpi seem slightly longer than in the (J . The species is apparently 

 found only at higher altitudes in early summer. 



HVDRIOMEXA SHASTA sp. IIOV. (PI. Ill, Fig. 4). 



Palpi apparently short and rather hairy ; primaries rather unicolorous 

 dark gray with median band slightly paler, the dark areas lightly sprinkled with 

 whitish dots; subbasal line (line 1) dark, very strongly oblique from costa to 

 cell, then bent at almost right angles and slightly ovit- 

 wardly oblique to inner margin one third from base 

 where it forms a small black patch ; band 2 almost 

 lost in the general dark color of the antemedian area 

 which is streaked with black along inner margin; 

 line 3 slightly wavy, in genera! rather evenly oblique 

 from somewhat before middle of costa to slightly 

 P 2 beyond middle of inner margin; median area much 



Un s of H Shasta constricted between vein 2 and inner margin, bor- 



dered outwardly by line 4 which forms an irregular 

 outward bulge opposite cell; band 5 (submarginaU broad but more or less lost in 

 dark ground color, its outer edge being scalloped and faintly bordered by a pale 

 shade ; an oblique dark apical dash, extending to s. t. band ; fringes long grayish. 

 Secondaries even gray with concolorous fringes and a slightly darker terminal 

 line. Beneath rather even dark gray with traces of small discal dots and post- 

 median line on both wings. Expanse 25 mm. 



