TWO NEW SPECIES OF PARASITIC NEI^IATODES. By Brayton Howard Ransom, Assistant Custodian, Helminthological CoUections, United States National Museum. Since Looss (1905) established the genus Trichostrongylus to in-clude the species T. retortseformis (type), T. instabilis, T. vitrinus, and T. froholurus , several other species have been added from time to time by various authoi-s. Including the two species described in the present paper, the complete list, with hosts and geographic distribu-tion, is as follows: T. retortseformis (Zeder, 1800) Looss, 1905; rabbits; Europe. T. instabilis (Railliet, 1893) Looss, 1905; man, baboon, ruminants; Africa, Europe, Japan, L^nited States, (?) India. (This and the next following species are perhaps identical.) T. coluhriformis (Giles, 1892) Ransom, 1911; sheep; India. T. vitrinus Looss, 1905; man, ruminants; Europe, Africa, United States. T. probolurus (Railhet, 1896) Looss, 1905; man, ruminants; Africa, Europe, United States. T. extenuatus (Railliet, 1898) Ransom, 1907; ruminants; Europe, United States, Australia. T. capricola Ransom, 1907; ruminants; United States. T. axei (Cobbold, 1879) Railliet and Henry, 1909; horse, ass; Europe. T.falculatus Ransom, 191 1 ; goat; Portuguese East Africa. T. calcaratus Ransom, 1911; rabbit; United States. T. pergracilis (Cobbold, 1873) Shipley, 1908; grouse; Europe. T. tenuis (Eberth, 1861) Railliet and Henry, 1909; geese; Europe. Strongylus quadriradiatus Stevenson, 1904, and Strongylus nodularis Rudolphi, 1809, which Shipley (1909) has placed in Trichostrongylus, are widely different from the type and should be excluded from this genus. Proceedings U. S. National Museum, Vol. 41 , No. 1 864. 363
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