146 TWENTY- FOURTH REPORT ON THE STATE MUSEUM, 



XL TRANSFORMATIONS OF HYPERCHIRIA 10 (FABR.). 



Of the above species, a small company of sixteen larvae was found 

 at Center. July 15th, arranged side by side in perfect parallelism on 

 a leaf of Populus tremuloides. They had evidently, at the time of 

 their collection, undergone their first molt. 



Second molt July 18th ; the leaf on which the larvae were taken 

 having become dry, they abandoned it and passed to the side of the 

 jar occupied by them, in regular procession and in, an unbroken line, 

 moving in single file, unlike Hemileuca Mala, whose processions are 

 in files of two's or three's. Later they had arranged themselves in 

 the form of an S on the table on which the jar rested, still maintain- 

 ing their line of inarch, with the head of one in contact with the ter- 

 minal legs of the one in advance. A twig of Populus balsamifera 

 was given them, which they refused, and ate in preference a fragment 

 of a dried leaf of P. tremuloides. 



Their cast head-case has none of the spines of the first segment 

 adhering to it, as has that of H. Maia* The exuviae are eaten by the 

 larvae. 



On the 20th, they were one-half inch in length. The head at this 

 stage, is pale red, with the clypeus fuscous, bordered with pale red ; 

 the eyes are on a black patch, surrounded with light red. The body 

 is rufescent, with eight lighter lines : there are six rows of spines, or 

 eight if the inferior row, interrupted on the proleg-bearing segments 

 be included, w^hich have black trunks with white branches ; the 

 lateral spines have their branches terminating in a black bristle ; in 

 the dorsal rows, except on the terminal segments, the branches are 

 without the bristle, and some are black tipped ; those of the substig- 

 matal row are Without the branches, having only bristles instead. 

 The legs are marked with fuscous outwardly, and the prolegs are 

 rufescent. 



Third molt From July 25th to 27th. Head fuscous anteriorly, 

 dull green superiorly, as also above the eyes and margining the 

 clypeus. Body white-dotted, and marked with a conspicuous stig- 

 matal orange-red band bordered below with white, a pale rufescent 

 vascular stripe, and two subdorsal and two lateral ones in which are 



* Twenty-third Report on^he N. Y. State Cabinet, 1872, p. 143. 



