Studies on Life-history of Bombycine Moths. 65 



lateral line, or rather a series of curved broad bright sulphur-yellow 

 spots each situated on the sutures between the two lateral piliferous 

 warts; these are especially noticeable on the abdominal segments. 



The cocoon. — One July 10th. It is rather broad and rounded, 

 whitish, with numerous yellow hairs, some white ones, and a few 

 black ones mixed with them. Just where these yellow hairs come 

 from I do not understand, as there are none on the larva, unless 

 they have changed in color since death. 



The first larval stage of Orgyia definita Packard. 



This stage has already been described by Mr. Dyar in Psyche, 

 YI, September, 1891, 145. 



They hatched June 19th-21st. The freshly hatched larva differs 

 from the other species in being pale whitish, tawny, or luteous. 

 The body is almost white, including all the legs. The head is pale 

 honey -yellow. The body is a little flattened, with the prothoracic 

 tubercles large and prominent. The hairs are all pale tawny, with 

 no dark ones ; those on the sides of the body and at each end very 

 long, some of them rather longer than the body. Otherwise the 

 larva is of the same general shape, and without tufts or pencils or 

 eversible glands, as in the freshly hatched larvae of the other species 

 of the genus. 



C5' 



Family ARCTIID^. 

 The transformations of Halesidota CARYiE Harris. 



The latest and fullest description of the different stages is by 

 Miss C. G. Soule in Psyche (VI, 158); she states that the larva 

 molted six times. Mr. Dyar gives nine stages (Psyche, V, 422). 



A batch of eggs received from Mr. H. Meeske hatched June 19th, 

 A. M. ; all (over a hundred) hatching nearly simultaneously. The 

 freshly hatched worms devour a part of the empty egg-shell, before 

 beginning to feed. They feed well on the elm, also will eat the 

 leaves of the wild cherry and chestnut. It is a remarkably beauti- 

 ful and conspicuous caterpillar. 



Egg. — Diameter 0.8 mm. Hemispherical in shape, the dome 

 rather high ; green when first laid. The shell is very thin and glassy, 

 when empty reflecting the colors of the rainbow ; the surface is 

 smooth, and under a i-inch objective is seen to be indistinctly pitted 



