PLATE 2. 



Fig. 1. — Camharus immunis spiniroslris Faxon. Young 9 . Pontocsuc Lake, Lane.sboro, INLass,, Aug. 



12,1911. M.C.Z., No. 7,364. X 3. 

 Fig. 2. — Cambarus immunis spiniroslris Faxon, c?, form I. Pontoosuc Lake, Lane.sboro, Mass., Aug. 



12, 1911. M. C. Z., No. 7,363. X 1. 



