So 



Second Stage (fig. 21 ). Witli the first moult the exterior of the 

 caterpillar undergoes a decided change; the hairs become so short as 

 to be visible only by the aid of a strong magnifying power. The 

 shovel-formed bristles have entirely disappeared. The warts, on the 

 other hand, have not decreased in size; in fact, those on the thoracic 

 rings, the last abdominal rings, and all in the infra-stigmal row have 

 become longer in proportion to the size of the body; the warts stand- 

 ing on the middle abdominal segments in the sub-dorsal row are the 

 only ones that have not grown larger. 



Third Stage (fig. 22). With regard to the hair the same may be 

 said as in the preceding stage, while the warts, which after the first 

 moult showed an increase, have become notably larger after the second. 

 A long horn-like formation has arisen from the first thoracic segment. 



Fourth Stage (fig. 23). This has not come under my inspection; 

 it will probably be found to difier essentially from the previous stage 

 only in the fact that the bristles on the warts have entirely disappeared. 



Fifth Stage (fig. 24). The color of this, as well as of the pre- 

 ceding stages, seems to be uniformly dark. The entire body is smooth, 

 the sub-dorsal warts of the middle abdominal segments have almost 

 entirely subsided, while those which were previously said to be in pro- 

 cess ot growth have grown to be long horns, which lend, especially to 

 the thoracic segments, a \'erv peculiar appearance. 



NYMPHALIDiE. 



01 this tamily I have also examined a few West Virginian forms 

 from the same point of view, and will briefly give the results, remark- 

 ing that the genus Melitcea was the most thoroughly studied. 



Melitaea Phaeton. First Stage (fig. 25). The body of the 

 minute caterpillar is covered with many separate bristles standing on 

 small warts; the latter are arranged in regular rows, namely: one 

 dorsal row, and on each side of the body a sub-dorsal, a supra-stigmal 

 and an infra-stigmal row; in addition to these there are bristles on the 

 head, on the last abdominal segment, and beneath the infra-stigmal 

 row. The latter are slightly curved, and quite fine at the point, but 

 visibly toothed (fig. 25<2). 



Second Stage (fig. 26). After the first moult the exterior of the 

 caterpillar has essentially changed, namely: in place of the small pim- 

 ples, on which in the first stage the single bristles stood, large warts 

 now project, covered with numerous bristles, as in the first stages of 

 the Papilionidce. In their number and position these w^arts correspond 

 to the pimples of the first stage, and the bristles planted on them are, 

 like those first described, finely toothed, but somewhat shorter than 

 they in proportion to the size of the bodv. 



