MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 131 



Larva. 



rackiirtl. Fifth Ut-p. U. S. Kiit. C'omiii. Ins. iii.j. Forest Trees, p. 453, 1890. 



Moth. — Oiu' iiKiIe. Sniallcr and (Uillcr brown tliaii T. aiiiculis, with a slight 4ilac tint on the 

 head, tliorax, and t'oio wings. L'alpi whitisli lielow, dark blown above, as in I. (tpimlis; fiont of 

 head sliglitiy Inoader and squarer; nie<lian thoracie l)rown band as in /. (ipichlis. Fore wings 

 with tlie costal edge straighter and the apex less turned up than in f. (ijiicalis, the apex Ijeing 

 sliglitly more rounded tliau in that speeies or in I. inclufid. IJasal line distinct, making a sluirp 

 angle on tlie cubital vein, and more incurved in tlie subcubital space than iu I. ajncalis; second 

 line much more suddenly incurved than iu I. (ipicalis, the same line being straight iu I. indusa; 

 the sliort third line as in I. apicalis, but more sinuous. Fourth and outer line uuach as in I. 

 apicalin, but the species differs from all the others known by the large conspicuous irregular 

 whitish ocherous patch which fills in the costal curve of this line and extends halfway from the 

 costal end of the line to the apex of the wing; no deep brickred discoloration on each side of 

 costal half of lourth line, so distinct in f. (ipicalis, but a long distal blackish stripe extends along 

 the tirst cubital venule to the submaiginal row of brown dots, which are not so distiuct as in /. 

 apicalis or I. iHciuna, tlunigh the marginal row of dark brown lunules is as distinct as in I. indusa. 

 Fringe as in I. hidufia, but tluit on tlie liind wings much darker. Hind wings darker tliau iu 

 /. apicalis. Wings beneath much as in /. apicalix^ but there is no reddisli tint toward the apex» 

 and the white oblique costal streak is mucli less distinct. There are traces of a common brown 

 diffuse line. Abdomen a little shorter, the fan or tu It of scales perhaps shorter and expanding 

 wider. 



Expanse of wings, 25 mm.; length of body, 12 mm. 



This species differs from I. iitdu.'ia and apicalis in the transverse lines on the fore wings being 

 very much more sinuous, and it need not be confounded with any of our other species. The white 

 costal mark is oblique and curved much as iu apicalis. 



Larva before the last molt. — Head broader than tlie body, ffattened iu front, dull black, with 

 long white hairs. Body flattened, with yellow and reddish longitudinal stripes; three dorsal faint 

 red stripes on a yellowish ground, and three deep lake-red lateral stripes, the lowermost the 

 broadest and deepest in hue. Two bright yellow lateral stripes. Five pairs of flesh-colored 

 abdominal legs, which are pale amber, colored like the underside of the body. Length, 9 mm. 



Larca after the last molt. — Markings much as in the previous stage. Lengtli, 17 to IS mm. 



Cocoon. — The rude cocoon is formed by tying a few leaves together, gathering them by a web 

 at the edges, thus forming a roomy chamber, partly lined with silk, within which the chrysalis 

 rests. 



Pupa. — Smaller aud not so full and rounded at the end as in I. iiicliisa; cremaster as in that 

 species, ending iu two stout, very short, recurved spines. Length, 12 mm. 



Habits. — The caterpillar of this interesting species was lound July 30, at Brunswick, Me., 

 feeding on the aspeii (Populus tremuloides). It molted August 10, and about the 20th began to 

 spin a silken cocoon between two leaves. The moth (a male) appeared iu the breeding cage at 

 Providence, ]May 20. Like I. indusa, it sits with the wings folded sharply over the back, with the 

 fore legs held straight out in front and the tufted tail upcurved. 



Food plant. — Populus tremuloides. 



Geographical distribution. — This species is a member of the Ai>palachian fauna. Brunswick, 

 Me. (Packard); Kittery Point, Me. (li. Thaxter); Maine (U. S. Nat. Mus.); Maine, Canada- 

 (French); var. luculenta Indiana (French). 



Ichthyura iiiclusa Hiibuer. 

 (PI. Ill, figs. 17-UI.) 



I'liahrna anantomona Alibot and Smith, Nat. Hist. Lep. Ills. Georgia, 1797. 

 Irhlhijnra indusa Hiibu., Zutr. Drltt. Huud., p. 3(i, tigs. 5G1, 562, 1825. 



Cloftlera americana Harris, Kep. Ins. Mass., p. 311, 1811, 3il edit., PI. VI, fig. 12, aud figs. 213-215. 

 Ichtliijura inci«s(i Walk., Cat. Lep. Het: Br. Mus., iv, p. 1059, 1855. 

 Clonlera americana Fitch, Fifth Rep. Nox. Ins. N. York, p. 65, 1859. 

 Ichthyura indusa Morris, Synopsis Lep. N. Auier., p. 244, 1800. 

 Pack., Proc. Ent. Soc. Phil., iii, p. 351, 1864. 



