NEMATODE PARASITES OF BIRDS 231 



Life history. — Unknown; probably involves intermediate stages in 

 other hosts. 



D'/.stiihiiliun. — North America (United States (Michigan)). 



Type material. — No. 25538, U.S.N.M. (Bureau of Animal Industry 

 helminthological collection). Collected from a gizzard sent to the 

 laboratory by Dr. George R. La Hue, the gizzard having been sent 

 to him by Dr. Jan Metzeloas of the University of Michigan, Ann 

 Arbor, Michigan. 



The description by Stafseth and Kotlan of a new species of 

 C heUospirura from the grouse in Michigan appeared after the pres- 

 ent writer's study of the material submitted by Doctor La Rue was 

 in manuscript. Doctor Kotlan. learning of this fact, kindly turned 

 over specimens of his material to the present writer and gave her 

 the privilege of naming the species. A comparison of the two lots of 

 material showed them to be the same nematode. 



This species is close to C. gruveli in size, number of postanal 

 papillae, shape of short spicule and the position of vulva and anus 

 of female. Gendre, however, made no mention of the cordons of 0. 

 gruveli being spinous in nature and that is the most striking char- 

 acter of the species under consideration. Other differences are the 

 length of the spicules, the length of the cordons (in C. gruveli they 

 extend almost to the posterior end of the first part of the esophagus, 

 in C. spinosa not beyond the anterior third) the arrangement of 

 cephalic papillae, the position of the caudal papillae and the egg 

 sizes. The present writer has therefore made this a new series. 



Genus CHEVREUXIA Seurat, 1918c 



Synonyms. — Spiroptera Rudolphi, 1811). part; Dispharagus Dujar- 

 din, 1845, part. 



Generic diagnosis. — Acuariinae (p. 211) : Body straight and fili- 

 form. Cuticle thick, distinctly striated transversely, and raised ante- 

 rior to the postcervical papillae to form a large collar, encircling this 

 part of the body as a hyaline ring or sheath. The anterior region of 

 the body also bears 4 cuticular cordons originating anteriorly in the 

 median dorsal and ventral lines, extending posteriorly along the sub- 

 median lines, and uniting on the lateral surfaces in a curve resting 

 on the free border of the collar; (hey are flanked on their inner sur- 

 face by a straight cuticular zone of marked striations. Postcervical 

 papillae symmetrical. Tail short, Caudal pores subterminal. Mouth 

 with 2 lateral obtusely pointed lips the shape of an inverted V; a 

 pair of sessile papillae at the angle of insertion of each lip. Buccal 

 cavity or pharynx long, straight and tubular. Esophagus distinctly 

 divided into a transparent muscular pari, surrounded directly pos- 

 terior to its origin by the nerve ring, and a glandular opaque part 



