^"^im"'] PROCEEDINGS OF THE NATIONAL MUSEUM. 429 



the median space; concolorous, black ringed. Orbicular large, oval, 

 oblique, i)ale. Keuiform large, upright, pale, with fuscous inner line 

 and powderiugs. Secondaries pale fuscous, darker outvvardly, with a 

 distinct dusky line. Beneath pale, powdery, with outer line and discal 

 dot. Eead and thorax concolorous, tuftings distinct. 



Expands 40 millimetres = 1.60 inches. 



Habitat. — Labrador, Greenland, Iceland. 



I have seen the 9 only, aud the insect seems rare. The dusky me- 

 dian space allies the insect to the preceding section, but the pale ter- 

 minal space and punctiform or broken shade preceding the s. t. line are 

 characteristic of the present group. It is not improbable that this is 

 also a form of exulis. 



Group arctica. 



The species of this group are of large size; robust, with apices of 

 l)rimaries well marked, fringes slightly but perceptibly scalloped, hind 

 angles somewhat retracted, and abdomen elongate and conic. The 

 thoracic tufts are dense, the anterior divided crest not prominent, but 

 the bisal tufts very well marked; the abdominal tufts are prominent. 

 They agree in essential features of maculation, the s. t. space being rather 

 paler, sometimes contrasting and the terminal space uniformly darker. 

 The reniform is always more or less white marked, and the general re- 

 semblance to arctica is obvious at a glance in all the species save occi- 

 (lenSy which, however, is not likely to be referred elsewhere even 

 though somewhat aberrant in color. 



The genitalia of those species of which the males are known are of 

 the normal Hadenoid type, though differing in detail. 



Arctica is so well known that it scarcely requires description, the 

 deep red-brown median space and contrasting blue-gray s. t. space are 

 characteristic. The outer margin of tip of male harpe is densely fringed 

 with spinules, and the inner inferior angle has a small brush of smaller 

 spines continued sparsely along the inner margin and more dense near 

 the superior angle, which is narrow. The clasper is slender, extending 

 to the end of the tip. 



Albina replaces the deep red brown by a more yellowish brown, aud 

 the s. t. space is still more yellowish, with a bluish- white shade opposite 

 hind angle. The s. t. line is yellowish, and has a distinct though not 

 prominent W mark on veins three and four, not so marked however 

 to cause any doubt as to which group it should be referred. The tip of 

 male harpe is smaller, the outer margin less rounded, and the brush of 

 spinules at the inner inferior angle larger and more dense. The supe- 

 rior angle is rather broad and deeply excavated, the clasper moderate, 

 and reaching to end of harpe. The species is well distinguished from 

 castanea, to which Mr. Grote had referred it. 



Gastanea is darker, more evenly colored than either of the preceding, 

 and the s. t. space is but little paler. The terminal space is darker, 



