SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE, VOL. xxxni. 



PLATE 4. 



FIG. 2. 



FIG. 4. 



BAL&NOPTERA PHYSALUS (L.). 



Fit;. i. Typi- of /I. 1,-cliraslris (Cope). Fig. 2. Cape Cod, Mass., No. 16045 U. S. N. M. Fig. 3. Cape Cod, M;i^.. \... 16039 U. S. N. M. 

 Fig. 4. Type of />'. tectirostris (Cope); first rib. first lumbar vertebra, first dorsal vertebra, axis. 



