165. 



10. Excretory pore in female slightly posterior to middle of esopha-nas; 

 males with 2 ventro-median esophageal oapillae anterior to the ex- 

 cretory pore aeoualis Allen, 1957 



Rxcretory core in female near base of esophap;visj male with one ventro- 

 median papilla anterior to excretory pore .... proximus Allen, 1957 



11. Male with one ventro-median papilla anterior to excretory oore 

 californicus Allen, 1957 



Male without ventro-median esophageal papilla . . obscurus Allen, 1957 



Genus Triplonchiujn Cobb, 1920 

 (Key to th'? soecies) 



1, Tail length less than anal body diameter; intestine not extending 



into caudal cavity ohtusicaudatvim Stek. £; Teunissen, 1938 



Tail length more than anal body diameter; intestine extending into 

 caudal cavity 2 



2. Length 0.6 mm, tail conical, intestinal extension almost completely 



filling caudal cavity minor Thome, 1939 



Length 1.0 mm or more, tail more cylindrical; intestinal extension 

 just slightly extending into caudal cavity. . . cylindricum Cobb, 1920 



