l?i PROCEEDINGS OF THE NATIONAL MUSEUM. 



little dusky at the base, and with a blackisli, diffuse, exterior band. 

 Beneath, primaries smoky to the terminal space, all the markings of the 

 upper side faintly visible; terminal space powdery white; secondaries 

 whitish, with two narrow and one broad, diffuse, smoky transverse 

 bands. 



Expanse, 1.00 to 1.90 inches (40 to 48 mm.). 



Habitat. — Victoria and Cortiehl, Vancouver; Northwest British 

 Columbia; Seattle, Washington; Portland, Oregon. 



This species has been taken in some numbers by Dr. Dyar, at light, 

 and seems to be not uncommon. It is the palest of all our species and 

 easily distinguishable from those resembling it in size. There seems to 

 be little variation, save in the aniount of the black powdering. 



PANTHEA ACRONYCTOIDES Walker. 

 (Plates IX, iig. 5, male; fig. 6, female adult; XIX, fig. 4, male geuit;ilia.) 



Audela acronijctoidex Walker, Cau. Nat. and Geol., 1861, VI, p.37.— Grote, Can. 



Eiit., 1877, IX, p. 27; Bull. Geol. Snrv., 1878, IV, p. 169. 

 Panthea acronyctoidcH 8mith, List Lepidoptera, 1891, p. 34. 

 Panthea hucomelaua Mokrison, Proc. Ac. Nat. Sci., Pliila., 1875, ]). 428. — Grote, 



Bull. Geol. Surv., 1878, IV, p. 169, pr, syu. 



Ground color white or nearly so, quite heavily powdered with smoky 

 and black scales. Disk of thorax smoky; tip of collar black; patagiae 

 crosvsed by two blackish bands. Primaries (piite heavilj' powdered witli 

 smoky or black, the tendency being to leave the basal space moderatelj^ 

 pale, the cell almost whitish, and the terminal space gray. Basal line 

 black and traceable across the cell. Transverse anteiior line single, 

 almost upright, but well outcurved in the interspaces. It is variable in 

 width and in definition. Transverse posterior line irregular, narrow, 

 denticulate, strongly incurved in the subniedian interspace. Median 

 shade line distinct, broad, diffuse, usually parallel with the transverse 

 posterior line; the tendency being to fill the space between these lines 

 completely. Subterminal line very strongly dentate; much as in port- 

 landia, but the teeth yet more marked. The subterminal si^ace is smoky 

 almost to the transverse posterior line, leaving only a narrow white 

 shade. There is a terminal dusky linetending to break into spots, and 

 the terminal spa(!e is blackisli powdered, sometimes becoming smoky. 

 The orbicular is jjresent as a black dot; the reniform as a small black 

 crescent. Secondaries whitish; more dusky at base, with a blackish 

 submarginal band which shades gradually toward the base and, as a 

 whole, the female is much darker than the nuile. Beneath whitish, both 

 wings crossed by three rather indelined smoky bands, which are much 

 better defined on the secondaries. 



Expanse, 1.45 to 1.55 inches (30 to 38 mm.). 



Habitat. — River Kouge in June; Canada; Maine; New York; IMassa- 

 chusetts; Minnesota; Wisconsin; Corfield, Vancouver. 



This is the smallest of the species in average expanse, though speci- 



