U. S. NATIONAL MUSEUM 



PROCEEDINGS. VOL. 79. ART. 18 PL. 1 



PROTOSTRONGYLUS STILESI 



1, Bur.sa of male; 2, esoiihagiis; 3, spicules, gubernaculum, and telamon; 4, tail end of feiimle; 5, spicules; 

 fi, vulva and provagina of female 



