U. S. NATIONAL MUSEUM 



BULLETIN 166 PLATE 23 



Species of Ethusa. 



i,E. mascarone panamensis, ovigerous lemale (66797). X 2)^, ventral view; 2, E. m. americana, male, Tiburon 

 Island, X 3, ventral view; 3, E. mkrophlhatvm, male (66829), natural size, ventral view. 



