6 PROCEEDINGS OF THE NATIONAL MUSEUM vol.73 



bifurcation. The ovary is oval, 99/* to 114/. by 127/. to 170/., and is 

 situated immediately posterior to the posterior testis. The recepta- 

 culum seminis and shell gland are located a short distance behind the 

 ovary. The vitellaria are made up of few compact irregular fol- 

 licles, occupying a space 350/. to 400/. long, on each side of the body 

 lateral to the intestinal ceca, and not extending anteriorly beyond 

 the level of the posterior edge of the posterior testis. The uterus 

 consists of an ascending and decending branch and of numerous 

 lateral coils, extending posteriorly to the posterior end of the body 

 and anteriorly to the ovary. The eggs are small, oval, brown in 

 color, and are 35/. to 38/. long and 21/t to 24/. wide. 



Host. — Ateles geoffroyi. 



Location. — Gall bladder. 



Z(?m^%.— National Zoological Park, Washington, D. C. 



Type specimens.—VnitQd States National Museum Helmintho- 

 logical Collections No. 27599; paratypes. No. 27369. 



EEFERENCES 



BOULENGEB, C. L. 



1926. Report on a collection of parasitic nematodes, mainly from Egypt. 



Part IV. Trichostrongylidae and Strongylinae, Parasitology,* 



Cambridge (Eug.), vol. 18 (1), January 22, pp. 8&-100. 

 Haix, Maukice G. 



1916. Nematode parasites of mammals of the orders Rodentia, Lagomor- 

 pha, and Hyracoidea. Proe. U. S. Nat. Mus., vol. 50 pp 1-258 

 pi. 1, fig. 290. 



MlLLEE, GekEIT g. 



1924. List of North American recent mammals. U. S. National Museum 



Bull. 128, pp. xvi+673. 

 YoEKE, Wareington and Maplestone, P. A. 



1926. The nematode parasites of vertebrates. With a foreword by C. W. 



Stiles, xi+536 pp. 307 figs. London. 



