364 



PROCEEDINaS OF THE NATIONAL MUSEUM. 



VOL. 41. 



Family STRONGYLID^ Cobbold, 1864. 



SiaTofamily TE,ICIIOSTE,0^<rG-YIL.IIsr^E: JL.eiper, 1908. 



Genus TRICHOSTRONGYLUS Looss, 190S. 



For generic diagnosis, see Looss (1905) or Ransom (1911, p. 86). 



TRICHOSTRONGYLUS FALCULATUS, new species. 



Specific diagnosis. — Trichostrongylus: Male 4.6 mm. long by 80 jjl in 

 maximum thickness (at base of bursa). Latero-ventral (l. v., fig. 1) 



and externo-lateral rays (e. I., fig. 1) 

 of bursa about equal in width, wider 

 tlian any of the other rays. Medio- 

 iateral ray (m. I., fig. 1) about two- 

 thirds the width of the latero-ventral 

 or the externo-lateral ray. Postero- 

 lateral ray {p. I., fig. 1) slightly nar- 

 rower than the medio-lateral ray, 

 curves dorsally in its distal })ortion 

 awa}^ from the latter. Externo-dor- 

 sal {e. d., fig. 1) and ventre- ventral 

 (?'. v., fig. 1) rays narrower than smj 

 of the other paired rays, Ventro- 

 ventral ray straight. Externo-dor- 

 sal ra}^ curved dorsally in its distal 

 portion, its 

 tip a consider- 

 able distance 

 from the mid- 



lOOyU. 



Fig. 1.— TRICHOSTRONGYLUS FALCULATUS. 



Bursa of male viewed from right side. 

 d.T., DORSAL ray; €. d., externo-dorsal 

 ray-; e. I., externo-lateral ray; I. v., 

 latero-ventral ray; m.L, medio-lateral 



ray; p, L, EOSTERO-LATERAL RAY; V. V., 

 VENTRO-VENTRAL RAY. 



die of the dor- 



sal ray, but 



nearer to the 



latter than to 



the tip of the 

 postero-lateral ray. Dorsal ray {d. r., fig. 1) 

 bifurcated distally, each branch having a bi- 

 partite tip. Spicules (fig. 2) similar in shape 

 and size, 100 pt long, brown in color. An an- 

 gular projection from the ventral side of each 

 spicule about 60 /( from the anterior end. The 

 terminal portion thus marked olF tapers gradually to a point, and is 

 slightly curved ventralward, so that it forms a falciform process 40 ^ 

 long. Gubernaculum (fig. 2) similar in color to the spicules, bent 

 almost at a right angle, with the convexity dorsal; distance be- 

 tween the anterior and posterior ends, 50 /«. 



lOO/x. 



Fig. 2.— TRICHOSTRONGYLUS 

 FALCULATUS. SPICULE AND 

 GUBERNACULUM VIEWED FROM 

 RIGHT SIDE. 



