562 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



The arrangement of warts and tufts is like all the other species, of which this 

 seems to be the most delicate and the larva the plainest in color, having no other 

 color than the greenish-yellow ground color, the sulphur-yellow vestiture and black 

 dorsal band and brushes. 



The moth. — Male. Differs from 0. leucostigma hj the more rounded, less angular 

 subcostal bend of the extradiscal line ; while the same line towards the inner edge 

 of the wing is more angular. The two blackish costal slashes are much longer iu 

 ■definita and these are succeeded by two or three long slashes pointed inwards, and 

 these by a series of pointed dots in the median interspaces. The submarginal white 

 sinuous and wavy line, sometimes so distinct in leucostigma, is obscure in definita, but 

 the white lunule is equally distinct in both species. In other respects the two species 

 are much alike, and are of the same size. Expanse of wings 30 to 31""™. 



12. Ichthyura palla French. 



The caterpillars of this moth were found feeding on willows in south- 

 ern Illinois through the most of September, resting in an inclosure 

 formed of several leaves fastened together at the ends of the twigs, 

 but no more than half a dozen occurred iu a nest. Those put in breed- 

 ing cages pupated before the middle of October; the moths appeared 

 in the following April and May. 



The moth is related to I. inclusa Hiibn. and I. ornata G. and R.; more 

 nearly to the latter in size and coloration, but differs from both iu 

 several particulars. Besides size and color, it differs from I. inelusa in 

 the coloring of its larva. It differs from I. oniata in the color of the 

 scales sprinkled over the forewings, the color of the spots outside the 

 fourth line, and the continuation of that line, as it is set here partially 

 obsolete opposite the disc, as well as in some other points. The apices 

 are no more produced than in 1. inclusa, nor is the costa more bent 

 (French). We would add that judging from two specimens received 

 from Professor French we are inclined to think that this is a variety of 

 I. inclusa Hiibner. 



iarm.— Length 1.25 inches when crawling; body nearly cylindrical, two blact 

 tubercles, close together, on the top of third and eleventh segments. On the back are 

 four bright but narrow yellow lines alternating with narrow black ones. The stigmatal 

 line is black; above this, or the subdorsal space, an irregular alternation of black 

 and white. Below the stigmata a narrow yellow line ; below this, or the substig- 

 matal space, the body is flesh-colored. Head shining black. A few gray hairs scat- 

 tered over the body. (French.) 



TAe »io</i.— Length of body .56; expanse of wings I.IO inches. General color of 

 body and forewings pale gray, the latter rather sparsely sprinkled with dark brown 

 scales. Palpi brown above, scarcely projecting beyond the head, third joint con- 

 cealed by the hairs of the others. Front slightly brownish, a tuft of pale gray scales 

 at the base of each antenna, the usual deep brown mai-k from the antennae to the top 

 of the thoracic crest. Forewings with the usual transverse Hues almost white. The 

 basal line makes a bend outward ou the median vein ; from this it goes in a straight 

 course to the subraedian vein ; from this to the posterior or inner margin it curves a 

 little outward. A second line extends from the costa about one-fourth of the distance 

 from the base obliquely to the posterior margin, near the posterior angle. A third 

 line passes straight across the wing from the posterior margin to the second, a little 

 below the median vein. The fourth begins as a white spot on the costa a little more 

 than two-thirds of the distance from the base, and joius the second on the posterior 



