. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 291 alae (fig. 354c). The caudal alae have 6 pairs of ray-like papillae, of which 4 are preanal and 2 postanal. In a worm mm. long, the 2 slender, equal spicules measure 6 mm. long by 10>n wide. The cloacal aperture in a worm this size is 110/x from the posterior extremity. Female 7 to 14 mm. long by 200 to 400/i. wide. Tail straight and obtusely conical, with the anus not far from tip. Vulva in anterior part of body; it is a longitudinal cleft with 2 prominent lips. Life history.—Unknown. Distribution.—Eur
. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 291 alae (fig. 354c). The caudal alae have 6 pairs of ray-like papillae, of which 4 are preanal and 2 postanal. In a worm mm. long, the 2 slender, equal spicules measure 6 mm. long by 10>n wide. The cloacal aperture in a worm this size is 110/x from the posterior extremity. Female 7 to 14 mm. long by 200 to 400/i. wide. Tail straight and obtusely conical, with the anus not far from tip. Vulva in anterior part of body; it is a longitudinal cleft with 2 prominent lips. Life history.—Unknown. Distribution.—Europe and Asia (Russian Turkestan). HISTIOCEPHALUS TRIDENS Gendre, 1921b Host.—Primary : Traehelotis senegalensis; secondary : Unknown. Location.—Under lining of gizzard. Morphology.—Histiocephalus (p. 290) : Red or reddish-yellow worms when alive, brown after killing so that internal anatomy is 3fl?. Figs. 354-355.—Histiocephalus laticaudatus. 354, a. Front view and b, lateral VIEW of head; c, male tail. After Drasche, 1S84. 355, Male. After , 1016 difficult to study. Body filiform; cuticle transversely striated. Head (fig. 356 a and b) distinctly set off from body by a furrow, following which is a cuticular collar, 16/* high in the male, 2 wide. Cloacal aperture 96^ from pos- terior extremity (1/54 of total length). Caudal alae (fig. 356 c) large. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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