176 PBOCEEDIMGS OF THE XATIONJL MUSEUM. vol.xxi. 



most distinct, to the outer margin, where it is almost faded out to the 

 ground coh)r. A second streak starts narrowly iu the median cell and 

 widens outwardly, becoming somewhat diffuse before the outer margin. 

 At the apex the space between the veins is also darker, slate gray. The 

 fringes and all the margins are white or nearly so. There is no trans- 

 verso maculation and no trace of the ordinary spots; but in well- 

 Xireserved specimens there is a series of small, slate-gray, intersi)aceal 

 dots. Secondaries white, sometimes a tritle soiled toward the outer 

 margin, where there is sometimes a faint dusky shade at the base of the 

 fringes. Beneath white, the disk of i)rimaries sometimes a little smoky, 

 sometimes the costal region of both wings yellowish. 



Expanse, 1.35 to 1.70 inches (34: to 4U mm.). 



Habitat. — British America and United States generally; Canada, 

 May and June; Massachusetts, in Ajuil; central New York, in June 

 and July; Kansas and California, in January. 



This widely distributed s[)ecies is easily recognizable by its strigate, 

 gray maculation on a whitish ground, resembling the species of Leu- 

 cania in this i)articular. The variation is almost entirely due to the 

 condition of the insect and its relative freshness. In recent specimens 

 all the described streakings are fully marked and we have the typical 

 alhovenosa ; after they have become a little faded by tlight the gray 

 changes to a luteou.s and we have evanidum. 



Mr. Morrison's ./«mo.9«w is an abnormally dark form in which almost 

 the entire insect becomes slate gray. It is perhaps a (question whether 

 the name should be retained, but as it is not strictly a synonym I list 

 it as an aberration, as which it has been already recognized. 



The harpes of the male are oblong, a little rounded at tip, at the 

 lower angle of which are a couple of little pegs. The clasper is along, 

 slender, curved hook resting on an obliiiue chitinous base which is 

 inferiorly continuijns with the clasper. 



This species is not rare. 



LARVA. 



Thaxtkh, Psyche, 1877, I, p. 188.— CoiiiiLi.Err, Can. Ent., 1880, XII, p. 45.— 

 Henky Edwauds, Ent. Amcr., 1888, III, p. 171. — Snydek, Ent. News, 1894, 

 V, p. 277. 



Stage IV. — Head bilobed, shining black, translucent whitish mot- 

 tlings at the side, a patch at vertex of each lobe and a broken inverted 

 V-mark bordering theelypeus; width, 1.2 mm. Body a little tlattened. 

 Warts large, black, with rather short bristly black hairs mixed with 

 pale; warts nearly in line transversely. A black dorsal shade band 

 tilling in between the warts on Joints 5 to 12; a mottled, transversely 

 streaked lateral band and traces of brown subventrally. Cervical 

 shield and anal i)late black. 



Statji' r. — Head as before, but the white spaces smaller; width, 1.8 mm. 

 Body largely mottled and streaked with black, a pale subdorsal line; 



