1864.] 423 



unknown, while the hirva of the former is sphinjiiforni and entirely 

 unlike all known Dryocampa larvae, and also unlike the aberrant i>ryo- 

 campade genus C('ratoatmpa, in the abdominal thorns being normally 

 placed, not ou every segment, but on alternate segments, and the sup- 

 posed larva of the latter had the normal Dryocampa form. I have this 

 year met with two larvae — one of which died and has been preserved 

 in alcohol, and the other either went underground or escaped* — which 

 I believe to be identical with that from which I bred, or supposed that 

 I bred, D. hirolor. I am well acquainted with the larvfe of D. sena- 

 toria Sm. Abb. and D. stigma Fabr. and they are certainly quite dis- 

 tinct from my two larvae ; neither do my two larvae agree with the 

 pretty full description of the larva of D. jiellucida Sm. Abb. given by 

 Dr. Fitch, (iV. Y. Rep. IT. §o24.) the upper dark stripe which is san- 

 guineous in ray larva being " dull brownish" in his, and the lower dark 

 stripe, which is also sanguineous in ray larva, being " dark olive green 

 or blackish" in his, and there being a "broad dull yellowish stripe" 

 iramediately below the spiracles and above the lower dark stripe in his, 

 which has no existence in mine, and a " narrow blackish line on the 

 middle of the back" in his which is not found in mine. There is also 

 a diiference in the number of the spines, Dr. Fitch assigning only six 

 spines to each segment, instead of .six to some and right to others; but 

 this is probably nothing but an oversight, as he assigns the same num- 

 ber to senaforia, which, unless my memory deceives me, is thorned like 

 my larva on joints 2 — 11. The only other known N. A. species of Drt/- 

 ocampa are imperialis Drury, the larva of which is quite different from 

 mine, and i-uhicunda Fabr., the larva of which is undescribed and the 

 imago of which, so far as I am aware, does not occur near Rock Island. 

 I subjoin a full description of my two larvae, and also a description of 

 the larva of r)ibicunda, with which I have been favored by Mr. J. A. 

 Lintner. It will be seen from comparing these two descriptions, that 

 my larva differs from that of ruhivunrhi in the horns of the 2nd seg- 

 ment being proportionally much longer, (for if they were proportion- 

 ally as short as in ruhiciinda they would be not quite .09 inch long in- 

 stead of .20 inch.) in the different arrangement and different structure 



* It turned out unfortunately, on emptying the earth from the tjreeding-cage, 

 that it must have escaped. — Nov. 14, 186i. 



