Akt. 22 A NEW NEMATODE PRICE S 



drmnedarU. In the latter species the vulva is located at the junction 

 of the anterior and middle thirds of the body and the spicules of the 

 male are considerably longer. 



The genus Nem-atodirus at the present time contains 14 species, and 

 for convenience in making determinations the following key is 

 appended, 



KBY TO THE SPECIES OF NEMATODIRUS 



1. Female less than 8 mm. long; vulva 1.57 mm. from posterior end; male not 



known; in monkey {Anthropopithecus troglodytes) N. weinbergi. 



Female more than 8 mm. long 2 



2. Spicules less than 2 mm. long 3 



Spicules more than 2 mm. long 10 



3. Spicules 0430 mm. in length, the proximal portion of uniform diameter and 



terminal portion pointed ; this terminal attenuated portion resembles an 



interrogation mark ; in hippotamus N. hopkeni. 



Spicules not so shaped 4 



4. Dorsal lobe not set off from lateral lobes 5 



Dorsal lobe set off from lateral lobes by a more or less distinct notch 6 



5. Medio-lateral and ix)Stex-o-lateral rays of bursa scarcely separated ; eggs 



with smooth shells N. filicollis. 



Medio-lateral and posterolateral rays of bursa well separated ; eggs with 

 alveolate shells N. roscidus. 



6. Tip of spicule pointed 7 



Tip of spicule not pointed 9 



7. One spicule slightly shorter than the other, and the two twisted at the 



end N. abnormalis. 



Spicules equal in length, tips not twisted 8 



8. Spicules 0.532 mm. long ; tail of female conical ; anus 140m from end of 



tail ; in Tayassns albirostris and T. tajacu N. molini. 



Spicules 0.90 mm. to 1.25 mm. long ; tail of female truncate ; anus 70 to 80 /j. 

 from end of tail N. helvetianiis. 



9. Tip of spicule spoon-shaped ; vulva at junction of posterior and middle 



thirds of body N. spathiger. 



Tip of spicule ending in a membranous bulb ; vulva about one-fourth of body 

 length from posterior end of body; in rabbits N. leporis, 



10. Vulva anterior to middle of body 11 



Vulva posterior to middle of body 12 



11. Vulva one-third of body length from anterior end; anus 145 to 1.50^ from 



end of tail; spicules 5 to 5.36 mm. long N. dromedarii. 



Vulva about 1 mm. anterior to middle of body ; anus 100 to 115,ci from end 

 of tail ; spicules 4.1 to 4.4 mm. long N. antilocaprae. 



12. Vulva 4 mm. or more posterior to middle of body ; both uteri posterior to 



vulva opening; spicules 4.5 to 5.5 mm. long N. mauritanicus. 



Vulva at or near the union of posterior and middle thirds of body ; otoe 

 uteruH anterior and one posterior to vulva 13 



13. Anus 80/x from tip of tail ; egg 75 to 100^ long by 50 to l^/j. wide ; spicules 



2.75 mm. long N. tarandi. 



Anus 120^ from tip of tail; egg 145 to IGO/it long by 80 to QO/i wide; spicules 

 3 to 3.4 mm. long N. neotoma. 



