PLATE 6. 



Fig. 1. — Cambarus imniuiiis spinirostris Faxon. Pontoosuc Lake, Lane.sboro, Mass., Aug. 12, lOlL 



M. C. Z., No. 7,363. Gonopod of the (f , form L la, outside, 16, front, Ic, inside. 

 Fig. 2. — Gonopod of the cf , form IL of the same, 2a, outside, 2b, front, 2c, in.gide. 

 Pig. 3. — Epistoma of the same. 

 Fig. 4. — Antennal scale of the same. 

 Fig. 5. — Annulus ventralis of the 9 of the same. 

 Fig. 6. — Chela of tiie cf , form L of the same. 



