874 



tJ. S, p. E. K. EXP, AND SURVEYS ZOOLOGY — GENERAL REPORT. 



of other sjiecies are devoured Ly them when left unprotected. They do not dive, but rest 

 lightly ujion the water, and rise easily from its surface. 



A second species of 2'achypetes, T. palmer stonii, is admitted by some authors and denied by 

 others. 



List of specimens. 



