242 MEMOIIIS OP THE NATIONAL ACADEMY OF SCIENCES. 



Heterocanipa obliqua Patkanl. 



(in, V. li-s. 7j, ><<?, 99.) 



Heterocanipa laria Walk., Cat. Lej). Het. ISrit. ilus., p. IOL'3, 1855. 



Helnocampa obliqua Pack., Proc. Eut. Soc. Pbil., iii, p. 368, 1864. 



Heleiocampa trouvclotii Pack., Eut. Soc. Phil., iii, p. 369, 1864. 



Heterocanipa obliqua Groto and Rob., Traus. Amer. Eut. Soc, i, p. 178, 1867, PI. IV, figs. 26,? , 27 9 . 



Helerocampa bruniua Grotc and Rob., Traus. Amer. Eut. Soc, i, p. 180, 18157, PI. IV, fi;,'. 28 9. 



Heterocampa obliqna Grote, New Cheek List Lep. N. Amer., p. 19, 1882. 



Smith, List Lep. Bor. Amer., p. 31, 1882. 



Kirby, Syu. Cat. Lep. Het., i, ji. 563, 1892. 



Dyar, Eut. News, iv, p. 33, Jan., 1893. 



Neum. and Dyar, Trans. Amer. Eut. Sue, xxi, p. 205, Juue, 1891; Jouru. N. Y., 

 Eut. Soc. ii. p. 117. Sept., 1894. 



Larva. 

 (PI. XXX, lig. 1, 1». 1;-, Ic, 2, 2«, 2/), 2c.) 



Packard, .Jouru. X. Y. Eut. Soc, iii. p. 27. March, 1895. (.Ml stages. Figs, of Stiiges I, II. with spines of//. 

 (julticitta. stage I.) 



Moth. — Two <? , two 9 . Dark brown, with darker streaks aiul lines, margined with reddish; 

 a large oblique costo-apieal white patch. 



Head, pectoral tuft, and thorax cinereous, except the black edges of the patagia and the 

 posterior margin of the thorax. 



Fore wings of a uuiform dark ashen brown; the basal half of the wing is cros.sed by three 

 interrupted lines, composed of linear, black, slightly curved lines or lunules, margined on both 

 sides with ferruginous ashen. The first or basal line is straight, and reaches only to the base of 

 the internal angle, which is black. The middle line is double, composed of two parallel linear 

 sinuate lines which become obsolete on the costa, is curved outward on the median vein much 

 more than in H. ustarte, and is obsolete 011 the internal edge. The third line is single and consists 

 of the curvilinear black discal mark and a second curvilinear line below the fourth median venule. 

 On the costa it is represented by two parallel bi'own lines, inclosing a white spot. Outside and 

 parallel to the discal curvilinear mark is a line composed of two curved lunules, which are 

 geminate, and inclose a reddish brown line. From the upper line extends toward the apex a 

 very distinct white patch dusted over with ocherous scales. On its outer edge are three black 

 interveuiilar streaks, bathed with ferruginous scales. In the middle of the wing and just below 

 is a round rusty patch. Below the median vein and its branches the wing is lighter, and, like 

 the costa, covered with cinereous and dark ocherous scales. 



Hind wings in i pearly white, base of the fringe dark; a dark discoloration on the internal 

 angle; costa dark. In the $ the hind wings are dusky white at base, becoming quite dark grayish 

 brown toward the outer edge. 



Underside of the fore wings dark, except in the middle region, which is very pale. White 

 and dark nuxrks on the costal edge, and the costoapieal white patch appears tlu'ough from above. 

 Hind wings white, the I'ringe discoloi-ed on the venules. 



Ex[)anse of wings, $ 42 mm., 9 18-53 mm. ; length of body, i 22 mm., 9 20-23 mm. 



This species differs from //. (iKfitrte iu the uniform dark ashbrown hue of the fore wings, 

 there being in the usual normal form no olive.green scales intermixed, but rather a tendency to 

 reddish brown, as seen in var. hrnnnea; also in the larger oblique white subapical patch, the 

 oblique bhu-k shade bordering it externally being broader, more difi'use than iu H. antarte, and 

 containing short intervenular blaitk slashes, aiul this band is in //. o/>//r/«(/ continued to the internal 

 edge of the wing, where is a white lunule; also in the first median spaces is a distinct round or 

 oval white spot. The inner doubly scall()i)ed line is much curved outward iu the discal space, 

 more so than in H. asfartc. The marginal scalloped black line has much shallower scallops than 

 in 11. uaUirte. The hind wings are also m(ue dusky than in the latter species, those near the apex 

 becoming straight lines. 



