16 



Habitat: Mt. Shasta, Calif. (July 17) (McDunnough) 1 S. Type, 

 Coll. Barnes. 



The single type was captured near the timber line at an altitude 

 of from 7000-8000 ft. ; its very dark color is quite characteristic as is 

 also the strongly bent nature of the subbasal line ; the type of Uncus 

 is that of the perfracta-frigidata group but as far as we can tell from 

 the rather twisted palpi they are short rather than moderate and we 

 place the species therefore next to henshazci Swett. 



Hydriomena irata Swett. (PI. II. Figs. 12, 15; PI. IV, Fig. 6; PI. 



VIII, Fig. 4). 



This is a good species and easily distinguished from californiata, 

 which it superficially resembles, by the shape of the Uncus as well as 

 by the shortness of the palpi. From the preceding group it is separated 

 by the stouter forks of the Uncus, the included space being rather more 

 U shaped than V shaped. 



The species is apparently rather constant iu coloration, judging by 

 our series of twelve species and other twelve in the Am. Mus. material 

 which all show distinct reddish antemedian and postmedian shading ; 

 the sub-basal line is strongly bent in the cell which serves to distinguish 

 the species both from the preceding group and from californiata in 

 which it is more or less straightly oblique. The form niveifascia 

 Swett, described as a variety of californiata (C. Ent. 48, p. 249) prop- 

 erly belongs here as an examination of the Uncus of the unique S 

 type, kindly loaned us by Mr. Swett, distinctly shows; the palpi are 

 slightly longer than usual which doubtless led to the reference but 

 this is a somewhat variable feature in the series before us. We figure 

 the type of this form on PI. IV, Fig. 6. 



Most of our specimens were captured in April but we have a 

 single specimen from Duncans, Vane. Is., B. C. taken in September 

 which would indicate if the label is correct at least a partial second 

 generation ; we have not seen the species from other localities than 

 Vancouver Island and the northern Pacific coast, a single S in the 

 Barnes Collection having been captured at Ketchikan, S. Alaska. 



II. Moderate palpi group. 



The following group of three species, with which we commence 

 the second group, frigidata VVlk. perfracta Swett, and transfigurata 

 Swett, all originally described from the Eastern States or Canada, are 



