. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 17 ORMTHOSTRONGYLUS HASTATUS (Linstow, 1905) , 1920a Synonym.—Strongylus hastatus Linstow, 1905. Hosts.—Lyrurus tetrix {Tetrao tetrix). Location.—Intestine. Morphology. — Ornithostrongylus (p. 11): Cuticle transversely striate and with a lateral cephalic ala originating 230/* from the head end. Head with 6 rounded papillae. Buccal aperture leads into a vestibule with parallel walls and 78/* deep. Esophagus 5/32 of body length or about 100 to 300^ long. Excretory pore at level of posterior third of esopha
. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 17 ORMTHOSTRONGYLUS HASTATUS (Linstow, 1905) , 1920a Synonym.—Strongylus hastatus Linstow, 1905. Hosts.—Lyrurus tetrix {Tetrao tetrix). Location.—Intestine. Morphology. — Ornithostrongylus (p. 11): Cuticle transversely striate and with a lateral cephalic ala originating 230/* from the head end. Head with 6 rounded papillae. Buccal aperture leads into a vestibule with parallel walls and 78/* deep. Esophagus 5/32 of body length or about 100 to 300^ long. Excretory pore at level of posterior third of esophagus. Male mm. long by 190/* wide. Bursa (fig. 12) with 3 lobes, the dorsal small but sharply defined. Ventral rays close together and parallel; the posterolateral set off from the medio-lateral and ex- terno-lateral, which are close together and parallel; the externo-. Figs. 11-12.—11, Ornithostrongylus Male bursa. After Linstow, 1882. 12, Ornithostrongylus hastatus. Male bursa. After Linstow, 1905 dorsal close to and parallel to the externo-lateral most of its length, but diverging distally; the dorsal with a long stem bifurcating near its tip and with 2 small external branches near the bifurcation and extending to incisions in the dorsal lobe. Spicules 220/* long, each terminating in a lancetlike prolongation which is enlarged in its median portion. Female mm. long by 530/* wide. Vulva near the posterior extremity. Eggs thick-shelled, 30/* by 21/* in diameter. Life history.—Unknown; probably simple and direct. Distribution.—Europe. Family AMIDOSTOMIDAE Baylis and Daubney, 1926 Family diagnosis. — Trichostrongyloidea (p. 7): Forms with a reduced buccal capsule present; in forms with the capsule much re- duced or, according to Skrjabin. absent, the head has 4 papillae or papilliform lips and 2 epaulets. Type genus.—Amidostomum Railliet and Henry, Please note that these images are extracted from scanned page images that may have been
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