176 STRONGYLOIDEA 



2. Choerostrongylus Gedoelst, 1923. 



Month-structures as in Metastrongylus. Bursa voluminous, 

 with its greatest dimension at right angles to the long axis of 

 the body. Wall of bursa not thickened in its distal part. 

 The tip of the antero-lateral ray not swollen. Spicules long, 

 terminating in double hooks. Tail of female straight, with a 

 ventral cuticular dilatation covering the vulva and anus. 



Hab. Respiratory passages of Suidae. 



Genotype : C. [^Metastrongylus] pudendotectus (Wostokow, 

 1905) (= M. brevivag hiatus Railliet & Henry, 1907). 



Wostokow, 1905, Rec. Trav. Inst. Vet. Charkow, vii, 2 (not 

 verified); Railliet & Henry, 1907, Compt. rend. Soc. Biol., 

 Paris, Ixiii, 751 ; Gedoelst, 1923, Bull. Soc. Path, exot., Paris, 

 xvi, 622 ; Skrjabin, 1924, Comp)t. rend. Soc. Biol., Paris, xc, 

 1215. 



3. Dictyocaulus Railliet & Henry, 1907. 



A very short and small buccal capsule present, with a 

 chitinoid ring at its base. Bursa of male short. Medio- 

 lateral and postero-lateral rays fused throughout the greater 

 part of their length. Terminations of dorsal ray bidigitate 

 or tridigitate. Sjiicules short and stout, simple in structure. 

 An accessory piece present. Vulva near the middle of the 

 body. Uterine branches opposed. Eggs contain embryos 

 when laid, and may be without shells. 



Hab. Bronchi of herbivorous Mammals. 



Genotype : D. [Strongylus] filar ia (Rudolphi, 1809). 



Rudolphi, 1809, Entozoorum Historia naturalis, ii, 219 ; 

 Railliet & Henry, 1907, Compt. rend. Soc. Biol., Paris, Ixiii, 

 752 ; Neveu-Lemaire, 1918, Mem. Soc. Zool. France, xxvii, 5. 



4. Synthetocaulus Railhet & Henry, 1907. 



Extremely slender forms. Posterior end of male reinforced 

 with a chitinoid arc. Bursa short. Medio-lateral and postero- 

 lateral rays parallel and close together. Dorsal ray a thick 

 trunk with short terminal digitations. Spicules fairly stout, 

 simple in structure or divided into two processes distally. 

 An accessory piece present. A " telamon " also present. 

 Vulva near anus. Uterine branches parallel. Eggs unseg- 

 mented when laid. Larva with an luidulating terminal caudal 

 process and a subterminal caudal spine. 



Hab. Finer bronchioles and connective tissue of lungs of 

 Mammals. 



Genotype : *S'. [Strongylus] cornmutatus (Diesing, 1851). 



Diesing, 1851, Systema Helminthum., ii, 315; Railliet & 

 Henry, 1907, Compt. rend. Soc. Biol., Paris, Ixiii, 752 ; Hall, 

 1910,' P/oc. U.S. Nat. Mus., 1, 163. 



