99. 



Tribe MF,TA CHROMA DOFAOEA Chitwood, 1936 

 (Key to genera after Gerlach, 1951) 



1. Male without cuticularized tube-like supplements. Only in the case 

 of M. vivipara are the supplements cuticularized, however not tube- 

 like. . , 2 



Male with tube-like, cuticularized supplements 3 



2. Esophageal bulb strongly developed; cuticular lining usually distinct 



Metachromadora Fllipjev, 1918 



Esophageal bulb weakly developed; cuticular lining faint or absent 

 .... Chromaspirina Filipjev, 1918 



3. Supplements strongly S-shapedj heavily cuticularized U 



Supplements faintly S-shaped; cuticularization light. . Onyx Cobb, 1391 



U. Cephalic and subcephalic setae present .... Sigmaphora Cobb, 1933 

 Cephalic setae present only Polys iema Cobb, 1920 



Genus Metachromadora Filipjev, I918 

 (Key to subgenera after Gerlach, 1951) 



1. Somatic setae in 10 longitudinal rows over entire body 



, . , . . Metonyx Chitwood, 1936 



Somatic setae confined to cervical region; if and when on posteiior 

 portion then short and scattered 2 



2. Amphids strongly cuticularized; cephalic setae short and often re- 

 duced to papillae Metachromadora Filipjev, I9I8 



Amphids less strongly cuticularized; cephalic setae though often 

 short, always distinctly setose 3 



3. Supplements large Chromadoropsis Filipjev, I9I8 



Supplements lacking; only unthickened excretory ducts for the glands 

 present it 



ll. Lateral alae present Neonyx Cobb, 1933 



Lateral alae absent . Bradylaimus Stekhoven, 1931 



Tribe SPIRINACEA Chitwood, 193 6 



Genera : 



Spirina Filipjev, I9I8 

 Laxus Cobb, 1891; 

 Eubostrichus Greef, 1869 



