ikC', 



Genus Discolaimus Cobb, 1913 

 (Key to species modified from Thome, 1939) 



1. Ovary one « . . monhystera Thorne, 15'39 



Ovaries two 2. 



2. Lip region set off by expansion only 



........ bulbiferus (Cobb, 1906) Th. & Swang., 1936 



Lip region set off by both constriction and expansion ,.,.... 3 



3. Length about U.O mm albarossicus Merzheewskaja, 19f^l 



Length 2,5 mm or less . . » h 



k» Tail devoid of caudal papillae auritus Lordello, 195? 



Tail with caudal papillae « . 5 



5. Length about 1.3 mm; vulva near kO%', males common . texanus Cobb, 1913 

 Length about 2.0 mm; vulva near 50^; males unknown 6 



6. Terminus obtuse major Thome, 1939 



Terminus subacute . similis Thorne, 1939 



Genus Discolaimium Thome, 1939 

 (Key to species modified from Thorne, 1939) 



1. Length under 1.0 mm, a= 25 or less latum Thome, 1939 



Length 1.0 mm or over, a= 35 or more 2 



2. Tail obtuse, rounded. . 3 



Tail more conoid k 



3. Tail longer than anal body diameter cylindricum Thorne, 1939 



Tail much shorter than anal body diameter . pseudoporum Fielding, 1950 



U. Tail arcuate, strongly convex dorsally gracile Thome, 1939 



Tail rather uniformly conoid, not convex 5 



5. Length over 2.0 mm; with four caudal pores. . . . gigas Fielding, 1950 

 Length less than 1.5 mm; one caudal pore present. . conura Thome, 1939 



