SYSTEMATIC INDEX 



XXIX 



Earn. 5. TRICHOSTRONGYLIDAE 



Subfam. 1. Trichostrongylinae 



1. Trichostrongylus Looss 



2. Cooper ia Ransom 



3. Travassosius Khalil . 



4. Graphidium Railliet & Henry 



5. Oraphidioides Cameron 



6. Obeliscoides Graybill , 



7. Hyostrongylus Hall 



8. Ostertagia Ransom 



9. Ornithostrongylus Travassos 



10. Trichohelix Ortlepp . 



11. Oswaldocruzia Travassos 



12. Molineus Cameron 



13. Haemonchus Cobb 



14. Nematodirus Ransom 



15. Mecistocirrus Railliet & Henry 



16. Histiostrongylus Molin 



Subfam. 2. Heligmosominae 



1. Heligmosomum RaiUiet & Henry 



2. Heligmosomoides Hall 



3. Nematospira Walton . 



4. Heligmostrongylus Travassos 



5. Nippostrongylus Lane 



6. Viannaia Travassos . 



7. Viannella Travassos . 



8. Impalaia Monnig 



Appendix to Heligmosominae 



9. Citellinema Hall .... 



10. Warrenius HaU . . .... 



11. Ollulanus Leuckart .... 



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Earn. 6. AMIDOSTOMIDAE 



1. Amidostomum Railliet & Henry . 



2. Epomidiostomum Skrjabin . 



3. Amphibiophilus Skrjabin . . . 



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