Studies on Life-history of Bombycine Moths. 83 



are all dark brown, and their average length is a little longer than 

 the body is thick. The plant* in the alcoholic specimens are borne 

 on a very long stalk. Each planta bears four hooks. 



For the full-grown larvae I am indebted to Mr. Otto Seifert, who 

 sent me several which he collected in New Jersey early in October. 



Last stage. — Length 23 mm. The body is cylindrical. The head 

 is rather small, being about one-half as wide as the body in its 

 middle; it is pitch-red, or reddish-chestnut, smooth, and shining. 

 The body tapers towards each end, and is armed with moderately 

 large, acutely conical though not very noticeable tubercles, each of 

 which gives rise to a single long, thick spinulated hair, the four 

 (on each segment) dorsal tubercles each bearing a black hair ; those 

 on the sides of the body bearing shorter, smaller white hairs. The 

 body is beautifully variegated with black, yellow, and white. The 

 segments are black above, with two transverse rows of cream-white 

 angular spots, the sutures broadly marked with buff-yellow. A 

 lateral broken, irregular broad cream-white line. The abdominal 

 legs are bufl-yellow, with a dusky patch on the outer side. The 

 thoracic legs are entirely black. The body beneath is bufif-yellow. 



The life-history of Ctenucha virginica (Charp.). 



In the Proceedings of the Essex Institute^ I described the trans- 

 formations of this moth, including the two later stages, which I 

 supposed to be the fourth and fifth. During the summer of 1890 1 

 was able to complete the life-histoi'y of this interesting form, and 

 the following notes may be added to those already published. The 

 6th and last stage was described in ni}'" first paper. 



The males appear to be more common than the females, and were 

 abundant on the shores of Casco Bay, Maine, at Merepoint, Bruns- 

 wick; but about three miles from where they were observed in 1862. 

 In 1863 a larva in the fourth stage was observed as early as May 16th, 

 while June Gth of the previous year, larvae both in the fourth and last 

 stages of growth were observed, a few mature caterpillars crawling 

 restlessly about. June 13th the larva began to construct its cocoon, 

 and it pupated four days later, and after remaining in the pupa state 

 nearly a month, the moth emerged July 15th The eggs were laid 

 in a patch side by side, as in the case of Arctians. The young 

 hatched July 28th, so that the egg state lasted a little less than two 



> Vol. IV, No. 1, Notes on the Family Zygaenidae, April, 1864. 



