147 



a larva at this period less than three centimeters long or more than four, 

 while some of the bright red ones are only five centimeters long, that is, 

 two inches. Now in the national collection I found larva- yet with remains 

 of gills, and some of these larva? were two and three-fourths inches long. 

 These were from .Jersey City, N. J. Not long ago Prof. Gage sent me a spec- 

 imen for examination, which he had taken at Wood's HoU, and this one is 

 fully as large as those I have mentioned. The smallest red specimens men- 

 tioned by Prof. Gage are two inches long. Some of the red specimens seen 

 by me at Washington were only an inch and a half, an inch and three-quar- 

 ters, and one only an inch and five-sixteenths long. Here we have evidence 

 of very great variation in the size of the larvse at the time of transforma- 

 tion. I believe also that there is, during the transformation, a considerable 

 shrinkage in the size of the whole body. Such shrinkage occurs during the 

 transformation of Amhy stoma microstomum, and probably of most salamanders. 

 Thus, while we are gradually getting at a correct knowledge of this in- 

 teresting animal, the green triton, or newt, it is a good subject for further 

 study. 



The proper systkmatii- name ok the prairie rattlesnake. By O. P. Hay 



The jn.iND crayfishes of Indiana. By W. P. Hay. 



The Crustacea ok Indiana. By W. P. Hay, M. S. 

 The following list of the crustaceans of Indiana is to be regarded as a 

 first contribution to the knowledge of this interesting group. Although it 

 represents the labor of quite an extended period, the labor was confined 

 mostly to the central part of the state, and to the larger forms ; and there 

 still remains the great multitude of microscopic forms only a few of which 

 are here numbered. It is for the purpose of directing the attention of the 



