PLATE 4. 



Fig. 1. — Parastacus ornucnnius Faxon, ci^. Corral, Chile, Dec. 18, 1008. Tj'pe. M. C. Z., No. 



7,355. 

 Fig. 2. — Epistoma of tlie .same. 

 Fig. 3. — Aiitennal scale from the right antenna, upper face. 



