^^^'X^ 



/Bemotrs of tbe flOuseum of Comparative Zoology 



AT HARVARD COLLEGE. 

 Vol. XL. No. 5. 



< 



zx^siii^^^. 



BY 



GLOVER M. ALLEN 



With Two Plates. 



■^ CAMBRIDGE, U.S.A.: 



printed foe tbe ADuseum. 



October, 1912. 



