14 



trict. Our specimens are mostly rather worn but the maculation is 

 readily tlistinguishable. The ruddy suffusion is quite characteristic 

 and very constant; with the exception of the second (antemedian) and 

 fifth ( submarginal ) the bands of the preceding group are reduced to 

 lines and the maculation is very clean cut. 



Hydriomena exculpata sp. nov. (PI. Ill, Figs. 1-3; PI. VIII. 

 Fig. 3.) 



Palpi rather longer than in the preceding species, especially in the 9 sex ; 

 type of maculation essentially the same but wing expanse considerably greater ; 

 the subbasal line is heavy, black, oblique, often slightly rounded below costa ; 

 basal area pale gray, the space between the subbasal and antemedian lines is usu- 

 ally of a deep rich brown, showing only faint traces of a smoky waved ante- 

 median band ; this brown color spreads over into the central portion of the pale 

 median space, at times very markedly (typical form); in other specimens the 

 brown color is greatly reduced being coniined to the margins of the cross-lines, 

 the whole wing appearing grayish ; the subterminal and terminal areas are 

 strongly suffused with brown; secondaries rather dark brownish with dark discal 

 dot and angled postmedian line. Expanse 30-34 mm. 



Habitat: Ketchikan, Alaska (May-July) 5 S, S 9. Types. Coll. 

 Barnes. 



Our types are all of the brown-banded form and were received 

 through the kindness of Messrs. A. N. Avinoff and B. Preston Clark; 

 for the gray form from the same locality we propose the name tribu- 

 lata; a few specimens (mostly 9's) from Kaslo, B. C, Crater 

 Lake, Oregon and Silverton, Colo, we cannot separate from these gray 

 Alaskan specimens ; it would seem as if the species extended down the 

 Coast Range and Rocky Mts. for a considerable distance but series of 

 both sexes from the southern localities will be necessary before decid- 

 ing this point. 



The shape of the Uncus is very similar to that of the preceding 

 species of which we would have considered it a race were it not for 

 the fact that e.rcitlf>ata shows a distinct lateral tubercle or ridge at the 

 base of the neck which is also rather broader than in tiiohimne. The 

 dates of capture on our species would seem to indicate a single genera- 

 tion extending over a considerable period of the summer. 



