TRICHOSTRONGYLINAE 179 



three ventral), and ends in a short spike. Anus of female has 

 apparently a swollen border. Vulva somewhat behind the 

 middle of the body. Uterine branches parallel. Viviparous. 



Hab. Respiratory passages of Mustelidae (probably one 

 species known). 



Genotype : F. [Ascaris'] broncJiialis (Gmelin, 1790) (= F. 

 mustelarum van Beneden, 1858). 



Gmelin, 1790, Systema Naturae, 13th ed., 3031 ; van 

 Beneden, 1858, Mem. sur les Vers intestinaux, Paris, 267 ; 

 1861, Cotnpt. rend. Acad. Sci., Paris, ii, 267 ; v. Linstow, 1873, 

 Arch. f. Naturg., xxxix, 300 ; and 1874, xl, 135. 



Fam. 5. TRICHOSTRONGYLIDAE Leiper, 1912. 



Buccal capsule rudimentary or absent. Bursa of male with 

 well-developed lateral lobes. Dorsal lobe small or ill-defined. 

 Parasites of the alimentary tract of Vertebrates. 



j Subfam. 1. TRICHOSTRONGYLINAE Leiper, 1908. 



More or less slender forms. Buccal capsule absent or rudi- 

 mentary and ill defined. Vulva towards the posterior end 

 of the body. Female genital tubes paired. 



1. Trichostrongylus Looss, 1905. 



Syn. Libyostrongylus Lane, 1923. 



Cuticle of anterior end may be raised into swellings. Cer- 

 vical papillae absent. Buccal cavity ill defined. Bursa 

 with large lateral lobes but without well-developed dorsal 

 lobe. Ventral rays widely separated and of very different 

 thicknesses ; the ventro-ventral thin and ventrally directed, 

 the latero-ventral thick, divergent from the ventro-ventral 

 and close to the lateral rays. Postero-lateral ray thinner 

 than, and divergent from, the remaining lateral rays, lying 

 close to the externo-dorsal ray. Dorsal ray cleft near its tip, 

 ending in short digitations. Prebursal papillae present. 

 Spicules short, spoon- or spatula-shaped, appearing twisted on 

 account of ridges on their surfaces. An accessory piece 

 present. Vulva ty^jically with protruding lips. Eggs thin- 

 shelled, segmenting when deposited. 



Hab. Alimentary tract of Herbivores, Rodents, Birds and, 

 more rarely, Man. 



Genotype : T. [Strongylus] retortaeformis (Zeder, 1800). 



Zeder, 1800, Naturg. der Eingeiveidewiirmer, 73; Looss, 

 1905, Centralbl. f. Bakt., (I), xxxix, 409; Travassos, 1914, 

 Brazil Medico, Rio de Janeiro, xxviii, 325; Hall, 1916, Proc. 

 U.S. Nat. Mus., I, 123 ; Lane, 1923, Parasitol, xv, 348. 



