348 NEW YORK STATE MUSEUM 



is of an umber brown, lighter at the incisures, gray dorsally witli a dark 

 vascular line; segments with a few white hairs, the longest of which sur- 

 round the subdorsal spines; horns of second, third and nth segments 

 curved, glossy black, with base luteous ; S|)ines dull black. Anal shield 

 marked with a cordiform, glossy black s]:)0t, having central and marginal 

 rufescent granulations ; anal plates with a subtriangular, granulated fus- 

 cous impression. Stigmata surrounded with a dark brown ring. Legs 

 shining black; prolegs with a black spot exteriorly, and with fuscous 

 near the plantae. 



T/iird molt. Length, i inch. The head and color of the body are as 

 before. A marked feature at this stage is the presence of long white 

 hairs given out from the central portion of the segments, of which the 

 superior ones are nearly twice the length of the thoracic horns, and the 

 lateral ones shorter; similar hairs of medium length project laterally over 

 the proleg-bases. The horns are -^^ inch long, of a lioney-yellow 

 color, and are studded with conical projections (of which the two apicaj 

 are fuscous), bearing a short, acute, fuscous spinule. The s[jines of the 

 two subdorsal rows are yfo inch long, of the color of the head, and 

 (except two exterior to the horns) have two fuscous, spinule-tippcd 

 projections. The lateral row consists of tubercles, of which those on 

 the anterior segments are simple, and on the terminal ones branched, of 

 a darker shade of color than the subdorsal spines. The substigmatal row 

 is composed of still smaller simple tubercles. Anal shield brown with 

 whitish granulations, bordered with tul^ercles, of which two are branched; 

 anal plates fuscous centrally. Legs ferruginous ; prolegs fuscous on the 

 outer side. 



Fourth molt. Length, if inch. A marked change occurs in the 

 horns at this molting. From being as heretofore cylindric they are now 

 conical, are armed with stout spinules, and have become shorter ; the 

 the length of the thoracic ones is -^^ inch, of the [josterior one, -^^ inch. 

 The anal plates are conspicuously marked with whitish granulations. 

 The stigmata are brown, with a central line and border of white, sur- 

 rounded with fuscous on a subquadrangular testaceous patch. « 



The full grown larvae have been described by Dr Harris as follows: 



They are from 3 to 4 inches in length, and more than ^ inch in 

 diameter, and, for the most part, of a green color, slightly tinged with red 

 on the back; but many of them become more or less tanned or swarthy, 

 and are sometimes found entirely brown. There are a few very short 



a Lintner, J. A. Entomological contributions, no. 2, contained in the 24th annual report of 

 the New York state museum, 1870, p. 150-54. 



