218 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



Seirodonta bilineata (I'ackard). 

 (PI. VI. Fig. 8<?.) 



Cecritaf bilineata Pack., Proc. Ent. Soc. Phil., iii, p. 359, 1864. 



Seirodonta bilineata Grote and Rob. (lueditud. Grote in letter.) 



Helerocampa tiirbida Walk., Cat. Lep. Het. Brit. Mus., xxxii, p. 419, 1865 (fde Grote and Rob.). 



Nuiodonta (Gluphisia?) ulmi Harris, Ent. Corresp., p. 302, 1869. 



Edema .' associala Walk., Cat. Lep. Het. Brit. JIus., xxxii, p. 426, 1865 {fide Grote and Kob.)- 



Seirodonta bilineata Grote, New Check ListN. Amer. Moths, p. 19, 1882. 



Pack., Fifth Rep. U. S. Ent. Cornm. on Forest Insects, p. 268, 1890. 



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



Kirby, Syu. Cat. Lep. Het.. 1. p. 569, 1892. 

 Cecrita bilineata Tsenm. and Dyar, Trans. Amer. Ent. Soc, xxi. p. 207. June, 1894; Journ. N. Y. Ent. Soc, ii, 

 p. 117, Sept., 1894. 



Larva. 



(PI. XXIX, figs. 1, !«. PI. XXXV, figs. 1, la-lc; 2, 3.) 



Harris, Ent. Corresp., p. 301 (PI. II, figs. 2, 3\ 1869. (Scarcely recognizable colored figures of larva.) 

 French, Can. Ent., xviii. p. 49, March, 1886. (Mature larva described.) 



Packard, Fifth Rep. U. S. Ent. Comm. on Forest Insects, p. 268. (Uncolored figure, PI. XXXII, fig. 4. Desc. 

 ex Harris. 



Moth. — Two S , two 2 . Body and wings uuifornily mou.secolorcd. Upper side of the palpi 

 and end of the patagia dark. 



Fore wings crossed by two distinct, dark brown, scalloped lines edged with gray, the inner 

 situated on the basal third of the wing and the outer forming the usual extradiscal line, the two 

 approaching each other on the submedian fold.' The inner line is bent inward near the internal 

 edge of the wing on the internal vein (VI), then curved outward between this vein and the sub- 

 costal vein. The outer line is bent outward on the internal vein and curved inward on the 

 submedian fold, and thence by a series of scallops ends, after making a great curve on the outer 

 fourth of the costa. The space between the two lines is slightly darker than the rest of the wing. 

 A linear black, not very distinct, discal mark. Toward the apex are four dark costal marks. 

 A very faint subniarginal line. 



Hind wings and abdomen a little paler than the thorax and fore wings ; a du.sky patch near 

 the internal angle. Underside of the wings uniformly mouse-colored and coucolorous with the 

 upper side of the hind wings. 



Expanse of wings, S 40 mm., 9 35-10 mm.; length of body, 5 15 mm., 9 1.5-17 mm. 



This plain, quakerish-in-garb species may be known by its uniform shining mouse tint and the 

 two narrow distinct curved and scalloped dark lines which cross the fore wings, and by the pale 

 mouse-colored hind wings. 



Young and older individuals feeding on the elm were kindly sent me by Mr. Tallant, from Ohio, 

 and were received July 10. A fully fed one (not mentioned, however, in the following description) 

 was found under an elm at Bath, Me., in August. 



Larva, titaye II. — "Head slightly bilobed, narrowed above, median suture deep; shuiing 

 brownish black, tUe clypeus pale; width, 0.9 mm. Body with anal legs elevated, a little enlarged 

 dorsally on abdominal segments 1 and 8. Where the large black tubercles of row i are uniform 

 light green a yellowish subdorsal line faintly seen; anal legs reddish. Two dorsal purple-brown 

 patches (in this individual) on segments 2-5 and 10-12, respectively, incised or almost broken at the 

 intersegmental furrows. SetiB rather coarse, blackish, single from normal coucolorous tubercles. 

 Legs all pale. Length at end of stage about 9 mm. Calculated series of widths of head in 5 

 stages: I, .(i2; II, .95; III, 1.44; IV. 2.18; V, .3.3." (Dyar MS.) 



Larva, Stage III (?).— Length, 10 mm. The head is much broader than the body, the front 

 broad and flat, pale yellowish green, with long dark hairs, and on each side a curved black-brown 

 line, not edged with white. The body is jiale straw or lemon yellow, the sides below more greenish, 

 with red specks and short curved lines in front, there being very few behind the first abdominal 

 •segment. The dorsal brick-red stripe is arranged as follows: On the prothoracic segment are 



' Tliis fold is the vestige of Vein V. 



