130 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 150. 



The description and figures of the bursal rays of this species, which 

 is described in a paper by Barker (1915), are not clear to me. The 

 worm is reported from the cecum of the host, a very unusual location 

 for worms of this genus, except when dead and being passed out. 



0.1 mm 



Fig. 159.— Teicho- 

 .strongylus fibe- 

 Rius. Posterior 

 extremity of male. 

 After Barker, 

 1915. 



0.5 mm 



Fig. 1(50.— Trichostrongylus fiberius. 

 MALE. After Barker, 1915. 



Fe- 



FiG. 161.— Trichostrongy- 

 lus delicatus. Bursa, 

 dorsal view, d, Dor- 

 sal ray; e. d., externo- 

 dorsal ray; e. I., ex- 



TERNO - LATERAL RAY; 



gub., gubernacuiJum; I. 



v., LATERO- VENTRAL RAY; 



m. I., medio-lateralray; 

 p. I. , postero-lateral 

 ray. Enlarged. 



TRICHOSTRONGYLUS DELICATUS Hall, 1916, new species. 



Specific diagnosis. — Ti^lchostrorKji/lus (p. 124) : Head small, 11 to 

 12 II in diameter. Lips indistinct. Cuticle finely striate transversely 

 and longitudinally, and not inflated in the head and neck region. 

 There is a cervical fold back of the head region. 



Male 4 to 4.55 mm. long with a maximum diameter in the vicinity 

 of the spicules of 105 ju. Esophagus simple, 155 /u, long. Cervical 

 fold about 140 /a back of the head end. Bursa has two large lateral 

 lobes, with curving, finely scalloped border, deeply incised in the 

 median line (fig. IGl). No dorsal lobe present. The ventro-ventral 

 ray is comparatively short. The tip of the latero-ventral curves 

 toward the ventro-ventral, though their tips are widely separated 

 (figs. 162 and 10;3). The tip of the medio-lateral is closer to the 

 externo-lateral than to the postero-lateral. The tip of the postero- 

 lateral curves toward the externo-dorsal. The short dorsal ray is 



