MEMOIRS OF THE ]S^xVTIONAL ACADEMY OF SCIENCES. 217 



Lomlon, Giiiiada (Saunders); Quebec (Fyles); Bruuswick, Me., commou (Packard); Boston, 

 Mass. (Sanborn, Harris); Anilierst, Mass. (Mrs. Fernald); Xewburg, N. Y. (Miss Morton); 

 Plattsburg, N. Y. (Hudson); New York (Doll); Brooklyn, Long Island (Hulst); Providence, R. I. 

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

 (Miss Soule); iNIanliattan, Ivans., "common on a|)])le'' (Popenoe); Aumsville, Oreg'. (Matteson Jide 

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

 Virginia, Cceur d'Aleue City, Idaho, August 29 (U. S. Nat. Mus.); salicis, Mount Shasta (H. 

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

 Massachusetts, New York, Maryland, North Carolina, Georgia (French); var. salicis California 

 (French). 



Seirodonta Grote and Robinson. 

 (PI. XLV, figs. 1, 1<(, an<l Ih, venation. PI. XLVIII, tig. 10, palpus.) 



Cecrita? (in part) Pack., Proc. Ent. Sop. Pbil., iii, p. 359, Nov., 1804. 

 Heterocampa (iu part) Walk., Cat. Lep. Het. Brit. Mus., Part xxxiii, p. 41i), 1865. 

 Kdema (in part) Walk., Cat. Lep. Het. Brit. Mus., Part xxxii, p. 426, 1865. 

 Seirodonta Grote and Rob. (inedited). List. Lep. N. Amer., p. xi, Sept., 1868. 



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



.'<uiith. List Lep. Bor. Amer., p. .SO, 1891. 



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

 Cecrita.m part, Nenm. and Dyar, Trans. Amer. Ent. Soc, xxi, p. 206, June, 1894; .Journ. N. Y. Ent. .Soc.,ii, p. 

 117, .^ept., 1894. 



Moth, — i and 9 . Head prominent, not quite as large as in Heterocampa; vei-tex broad, 

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

 toward the vertex a median elevation. Antenn.e of 5 x^ectinated three-fourths to the tip, as in 

 Heterocampa; in 9 simple, with a few ciliated scales beneath. Maxilhe well developed, twice as long- 

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

 rather narrow and long, with a lew spreailing scales below; third joint of moderate size, rather 

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

 wings not quite half as broad as long; costa slightly convex at the base and 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 {H. manteo), and the vena- 

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

 carved line. Iu the hind wings the costa is full near the base, more 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, with only a single pair of tibial spurs, the outer one being twice 

 as long as the inner. 



The genus differs from Heterocampa chiefly iu the venation, the discal venules forming a line 

 much curved in. I confess that these characters seem to me (piite trivial, especially when we take 

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

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

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

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



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

 able, since the larva; seem to differ so much, though the earliest stages of bilineata 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 iirst 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 reduced. Anal legs long and slender. 



Gcoijrapliieal distrihntion. — The single species known is conlined to the Appalachian sub- 

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



