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Genus Dorylaimus Dujardiiij 18U5 

 (Key to the species from Thome & Swanger, 1936 reprinted 1957) 



1. Cuticle with 18— iii| longitudinal wings or striae. „..,..,,, 2 

 Cuticle plain without longitudinal wings or striae, ..«.«... 9 



2. Lip region somewhat expanded^ hermaphroditic 



.. o ».. o »..,,.<... » liratus (Schn., 1866) Oerley, 1880 (s) 

 Lip region not expandedj bisexual .,*.,,<,..,,..,... 3 



3. Wings l8 — 20, ,-.,,«,.,o,,,,,„ striatus Daday, l89U (s) 

 U. Wings about 25. ,<,,.,,,,..,.. libycus Pierantoni, 1915 (s) 



Willis _J\J OX^ lUOirS 99»e«90O9»9CO9OO«»«*»t)««*» ^ 



5. Posterior third of esophagus enlarged . sulcatus Cobb, M, V., 1915 (s) 

 Posterior half or more of esophagus enlarged, ,.,„«...,.. 6 



6. Spear aperture less than one-third the spear length 

 ,,,,,,»,,, .helveticus (Steiner, 1919) Th, & Swang,, 1936 (a) 

 Spear aperture at least one-third the spear length, , 7 



7. Wings about hh* o , , . » montanus (Stef,, 1923) Th. & Swang, 1936 (a) 



8. Length well over 3inm.,,,,, ,.,,,. stagnalis Duj,, l8U5 (a) 

 Length under 3 mm . . , . » , , . carinatus Th, & Swang., 1936 (s or a) 



9. Female tails filiform, attenuated, conoid-cylindroid or spicate except 

 ten short tailed species keyed under sections 69 — 80j male tails 

 filiform or bluntly rounded with submedian papillae and with prerectura 

 extending opposite to, or anterior to, the supplement series j guiding 

 ring double but very frequently collapsed and appearing single. . . 10 

 Female tails conoid-arcuate, digitate, subdigitate, conoid to 

 hemispherical; male tails similar to those of females, without 

 submedian papillae, except ten species under sections 69 — 80j and with 

 prerectum extending within the range of the supplement series; guiding 

 ring single ,,««.,«««. 71 



10. Female tails filiform j male tails filiform or bluntly rounded ... 11 

 Female tails attenuated, conoid-cylindroid or spicate j male tails 

 bluntly rounded ,,,,,,,,....,,,. 37 



11. Lip region very narrow, conoid-rounded (t^ls of sexes similar) . . 12 

 Lip region more or less truncate 19 



12. Tails suddenly constricted near anus 



.... a ., o .,...., . . laevicapitatus Th. & Swang., 1936 (s) 

 Tails not suddenly constricted near anus, 13 



