Smithsonian Contributions to Knowledge, Vol. xxxiii. 



Plate 4. 



iM... 1. 



[■>•.. 2. 



Vw.. 4. 



Bal^noptera physalus (L.). 



I'is;. ..-l-vpe „f A'. l.Cirostris (Cope). Fig. 2.-Cape Cod, Mass.. No. 16045 U. S. N. M. 1 .,. .,.-Capc Cml. M.s... No. ..».V, V . S. N. M. 

 Fig. 4.-Type of B. hctirostris (Cope); first rib. first lumbar vertebra, first .lorsal vertebra, axis. 



