113. 



Genus Alaimus de Han, 1880 

 (Key to the species after Thome, 193?) 



1. Body tapering markedly both ways from near middle. Width, a= less 

 than $0. Length under 1.5 rm. Males unlcnown, except for 

 prirnitivus 2 



Body subcylindrical from esophagus base to near tail. Width, a= well 

 over 50. Length 2,0 mm or more, except simills and proximus under 

 1.5 nutie Males known, except for similis 99 



2. Post rectal blind sac of intestine present . . . thamupadi Maupas, 191-0 

 Post rectal blind sac of intestine not present 3 



3. Esophagus, b= less than k .....,U 



Esophagus, b= h or more 5 



U. Tail finely mucronated mucronatus Altherr, IQi^'O 



Tail without mucron minor Cobb, 1893 



5» Terminus subdigitate glissus Thome, 1^"39 



Terminus acute or subacute 6 



6. Tail length about four times anal body diameter 7 



Tail length 7-10 times anal body diameter 8 



7. Terminus acute, tail slightly arcuate acutus Thorne, 1939 



Tentiinus subacute, tail somevjhat hooked arcautus Thorne, 1939 



8. Female length 1.2 mm prip'itivrs de I'^an, 1880 



Female length 0,7mm parvus Thorne, 1939 



9. Length i;.0 mm elongates de Man, I906 



Length 2.5 or less 10 



10. Length under 1.5 mm 11 



Length 2.0 - 2,5 mm 12 



11. Esophagus enlarged in basal seventh similis Thome, 1939 



Esophagus enlarged in basal fourth proximus Thorne, 1939 



12. Without supplements, with a single preanal papilla. Male only kijown 



modestus Stekhoven and Teimissen, 1938 



With supplements , 13 



13. Supplements lU, male only known . , multipapillatus Wu & Hoeppli, ±929 

 Supplements 7 or less, both sexes known lU 



1)|. Female tail length 12, male tail 8 times anal body diairieter 



simplex Cobb, 191h 



Female tail length i4..5, male tail 3 times anal body diameter 

 tenuis Thorne, 1939 



Species inquirenda: 



A. filiform IS Daday, 189)4 



A. papillatus (Daday, 1899), Nicol., 1922 



