EXPLANATION OF PLATES. 
Prate XC. 
Fig. 1. Homyrus formosissimus Eastman (ex Agassiz MS.). C. M. Cat. 5233. x 5/6. 
Fig. 2. .Urosphen dubia (Blainville). C. M. Cat. No. 4015. x 6/7. 
Fig. 3. Blochius longirostris Volta. Immature example. C.M. Cat. No. 4312. x 8/9. 
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