16. 



Subfamily PANAGROL.A?"TNA'^ 

 (Key to the c^enera) 



1. Lip region bearing 6 inward-pointing, flap-like process vrith strongly 



sclerotized borders Pana' robe Ins Thorne, 1939 P. 17 



Lip region otherwise ( 2 species, both maybe beetle assc .iates) . . 2 



2. Circlet of 6 setose cephallic papillae present 



......... o MacrolaJP'-us Maupas, 1900 P.l? 



Cephalic papillae not setose 3 



3. Post corpus of esophagus bulbar, separated by distinct break in the 



corporeal lining. . . , Tricenhalobus Steiner, 1936 P. 17 



Post corT)us of esophagus not bulbar h 



h. Plate-like denticles present in pharynx 5 



Plate-like denticles absent in pharynx 6 



5. Isthmus about as long as corous Pana ~rodontu s Thome, 1935 



(U species, all maybe bark-boring beetle associates) 



Isthjnus much shorter than corpus Turbatrix Peters, 1927 



(T. aceti Muller, 1783) aceti Peters, 1927 is the vinegar eel- 

 worm and T. aceti (Muller, 1783) dryoohila (Leuckart, 1887) de Kan, 

 1910 has been as an inhabitant of white slime-flux of oak.) 



6. Ovary lying entirely anterior to vulva. . . . . Plectonchus Puchs, 1930 



(3 species bark beetle associates) 

 Ovary extending caudad past vulva 7 



7. Cheilostom hexagonal, the rhabdions consoicuous 



• • • Procephalobus Steiner, 193U 



(Contains a single species P. mycophilus Steiner) 

 Cheilostom triquetrous, the rhabdions obscure 8 



8. Tips of spicula bifid ...... Pana-rellus Thorne, I938 P. 18 



Tips of spicula not bifid 5) 



9. Male vrith ventromedian, preanal papillae. . Neocephalobus Steiner, I939 P.17 

 Male without ventromedian, preanal papillae .Panagrolaimus Fuchs, I93O P. 18 



