lU. 



Family CEPHALOBIDAE Chit. & Chit., 193U 

 (Key to the subfamilies adapted from Thome, 1937) 



1. Female with two ovaries . . . .ALLOIONMATINAE Chit. & Mcintosh, 193U 

 Female with one ovary 2 



2. Stoma much reduced, only cheilorhabdions developed. Basal esophageal 

 bulb without valvular apparatus . . . .DAUBAYLINA7. Chit. & Chit., 193U 

 Sterna not reduced. Basal esophageal bulb with valves 3 



3. Pharyngeal armature cephaloboid. Double flexure in ovary posterior 

 to vulva (except in occasional aberrant specimens). Spermatheca 

 present at anterior flexure of ovary. Annules about 2u or more wide.U 

 Pharyngeal armature panagrolaimoid. Ovary never with double flexure 

 posterior to vulva. No spermatheca present at anterior flexure of 

 ovary. Annules fine, much less than 2u wide. 

 PANAGROLAmiNAR Thome, 1937 P.l6 



k^ Lip region bearing 3 labial, and frequently 6 cephalic probolae 



ACROBELINAE Thome, 1937 P. 19 



Lip region without probolae CEPHALOBINAE Filipjev, 193U P.lU 



Subfamily CEPHALOBINAE Filipjev, 193U 

 (Key to genera after Thome, 1937) 



Wings extending to caudal terminus, female tails blunt and rounded 



Cephalobus Bastian, 186^ P.lU 



Wings extending only to phasmids, female tails attenuated 

 Eucephalobus Steiner, 1936 P. 15 



Genus Cephalobus Bastian, 186^ 



C. brevicaudatus Zimmermann, I898 



C. buchneri Meyl, 1953 



C. cornis (Thome, 1925) Thome, 1937 



C. dubras Maupas, 1900 



C. nannus de Man, I88O 



C. parvus Thorne, 1937 



C. persegnis Bastian, 1865 



C. strandi-comutus Allgen, 193U 



C. thermophilus Meyl, 1953 



