123. 



Genus Dor ylaim ellus Cobb, 1913 

 (Key to the species modii'ird fram Thorne, 1939) 



1. Cuticle id-th longitudinal and transverse striations 2 



Cuticle transversely striated onlye o.. »».,....»»•. ..3 



2. i-ength over 6 mm. ....o,«« heteruriis Stekhoven Teunisstn, 1938 

 Length less than 2mm»«o,,,. ,.,,., hediclcii Paesler, 19iil 



_^ # v/VaneS TJWO 0(*«*«ia«<%®«»*ooe4<»»9oe9 9*ooft»o»*L4 



L/vax'y smgic^ »oce-<-«»o»«<8««««»««co«oo9**« xu 



li. Anterior portion of esophagus not constricted. nodocho r dus Tliorne, 1939 

 Anterior portion of esophagus constricted to a narrow tube ■ , , . , ,5 



5. Cuticle coarsely striated* c,e.,.er».» striatus Thorne, 1939 

 Cuticle not coarselj' striatedo ..•.<>o«<>.«,e. 6 



6, Length about 1,0mm or over •»=.«.»»«»,.»,.»..»•• .7 



7» Tails bluntly roimded ,,,,,,,«,<,, » occidentalis Thorne, 1939 

 Tails somewhat elongate conoid ....e.»o.e«,o.».,.«8 



8. Preanal supplements Uj female knovm « . « , ,. , virginianus Cobb, 1913 

 Preanal supplements liij female unknoT-m, s,cc,.,,, ...... - 



• <>..<,....o..>, . multipapillatus Stekhoven & Tennissen, 1938 



9. Prerectum length five times body width. . , ^ , . parvulus Thorne, 1939 

 Prerectum length less than twice body width » » tenuidens Thorne, 1939 



10. Ovary posterior to vulva. «<,,.«,<,,.e,«.co.«e»»»ll 

 Ovary anterior to vulva »c.s«<,«esoooe... <;».... 12 



11. Anterior uterine sac present. .e,o».=...s. porosus Thome, 1939 

 Anterior uterine sac absent» engadinensis (Altherr, 1950) Altherr, 1950 



12. Tails subdigitate, b=Iu . , , , . mirabilis (de Man, l88It) Thorne, 1939 



13. Tails bluntly conoid, ...,,,, aequalis (Cobb, 1918) T}x)rne, 1939 

 Tails acutely conoid, arcuate . . fuorni (Altherr, 1950) Altherr, 1950 



