MEMOIRS OF TUE NATIONAL ACADEMY OP SCIENCES. 217 



London, Canada (Saunders); (Quebec (Fyles); Brunswick, Me., common (Packard); Boston, 



3Iass. (Sanborn, Harris); Amherst, Mass. (Mrs. Fernald); Ncwburg-, N. Y. (Miss Morton); 



riattsbnrg, N. Y. (Hudson); New York (Doll); Brooklj'u, Long Island (Hulst); Providence, R. I. 



(Clark, Bridgliani, Packard); Janesville, Md. (M. C. Z.); southern Illinois (French); Missouri 



(Miss Soule); ]\Ianbattau, Kans., "common on a])ple" (Popenoe); Aumsville, Oreg. (Mattesou fide 



Riley); Kansas, Missouri, Idaho, California, Oregon, Iowa, New York, District of Columbia, and 



Virginia, Ctpur d'Alene City, Idaho, August 29 (U. S. Nat. J\Ius. ); salicls, Mount Shasta (II. 



Edwards), and Y'osemite Valley (Dyar): Normal form. Florida (Palm); Canada, Kittery (Me.); 



Massachusetts, New \'"ork, Maryland, North Carolina, Georgia (French); var. .salicis California. 



(French). 



Seirodonta Grote aud Kobiuson. 



(I'l. XLY, figs. 1, 111, and 1/-, venation. PL XLVIII, 111;. 10, palims.) 



Cecritaf (in part) Pack., Proc. Ent. Soc. Phil., iii, p. 359, Nov., 18()4. 

 Helerocampa (iu part) Walk., Cat. Lep. Het. Brit. Mas., Part xxxiii, p. 419, 1805. 

 Edema (in part) Walk., Cat. Lep. Het. Brit. Mus., Part xxxii, p. 426, 18B5. 

 Seirodonta Grote aud Rob. (inedited), List. Lep. X. Amer., p. xi, .Sept., 18G8. 



Grote, New Check List N. Amer. Moths, p. 19, 1882. 



Smith, List Lep. Bor. Amer., p. 30, 1891. 



Kirhy, Syu. Cat. Lep. Het., i, pp. 569, 929, 1892. 

 Cec/'ifa, iu part, Nenm. and I>yar, Trans. Amer. Ent. .Soc., xxi, p. 206, .Juue, 1804; .lourn. N. V. Ent. Soc.,ii,p. 

 117, .Sept., 1894, 



2Iotli. — 3 and 9 . Head prominent, not quite as large as iu Hetei-ocampa; vertex broad, 

 triangular, with a flattened tuft in front of each antenna. Clypeus square, full in the middle, and 

 toward the vertex a median elevation. Auteunre of $ pectinated three-fourths to the tiji, as in 

 Heterocainpa : in 9 simjile, with a few ciliated .scales beneath. Maxillic well developed, twice aslong" 

 as the head, united and coiled up. I'alpi porrect, extending well beyond the front; second joint 

 rather narrow aud long, with a few spreading scales below; third joint of moderate size, rather 

 short, distinct, conical. Thorax not tufted, but the jirothorax with long dense hairs beneath. Fore 

 wings not quite half as broad as long; costa slightly convex at the base aud apex, straight between, 

 not bent at the apex; outer edge oblique, not augulated, but little shorter than the internal edge. 



Venation: A long narrow subcostal cell, much as in Heterocampa {IT. maitteo), and the vena- 

 tion otherwise scarcely differs from that of II. manteo, except that the discal veins make a regular 

 curved line. In the hind wings the costa is full near the base, moie so than the species of 

 Heterocampa; apex a little more pointed than in H. manteo; the outer edge slightly bent in the 

 middle, while the costal vein is shorter, ending much nearer the middle of the costa than in 

 Heterocampa. Legs rather long, witli only a single pair of tibial spurs, the outer one being twi(;e 

 as long as the inner. 



The genus diflers from Heterocainpa chiefly in the venation, the discal venules forming a line 

 mnch curved in. I confess that these characters seem to me quite trivial, especially when we take 

 into account the very close similarity of the larva to that of M. manteo and the great difficulty of 

 distinguishing one from the other. I had concluded to unite it with the Heterocampa, but regard 

 it provisionally as a distinct genus. The style of markings is not as we find it iu Heterocampa, 

 there being two defluite lines on the fore wings, arranged, however, much as in H. manteo. 



To place this species in the genus Cecrita, close by guttivitta and biundata, is scarcely allow- 

 able, since the larv» seem to difter so much, though the earliest stages of hilineata have yet to be 

 observed. 



Larva. — Body cylindrical, head smooth, rounded, no wider than the body, which is marked 

 almost precisely as in Heterocampa manteo, with two pale subdorsal lines, which diverge on the 

 prothoracic segment, are close together on the second and third thoracic segments, and again 

 widely separate from the front edge of the first abdominal segment to the end of the body; some- 

 times the space between is reddish and extends down on the sides of the third and sixth segments. 

 A yellow or white spiracular line. A pair of small dorsal piliferous tubercles on the first and 

 eighth abdominal segments; the other minute, much i-educed. Anal legs long .and slender. 



Gcof/raphical flistrilrution. — The single species known is confined to the Appalachian sub- 

 province, but since it occurs at Fraucouia, N. H., may be found in the Uudsonian fauna. 



