4 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.77 



The uterus pursues a course similar to that in E. hassalli. The geni- 

 tal pore is situated slightly to the right of the cirrus pouch. The 

 vitellaria are composed of uniform follicles commencing a short dis- 

 tance caudad of the transverse muscular ridge and extending to about 

 the equator of body. Eggs oval, brown in color, and from 30/x to 

 33ju, long by 15/x to 18/a wide. 



Host. — Querquedula discors. 



Location. — Intestine according to label; probably urinary tract. 



Distribution. — United States (Miles City, Mont.). 



Type specimen. — United States National Museum Helminthologi- 

 cal Collection No. 29188. 



E. xoehri resembles E. zakharowi Skrjabin in body form and extent 

 of the vitellaria, but may be differentiated from this species by its 

 smaller body size and position of testes. The testes are separated 

 from each other by the width of the intercecal space in E. wehri 

 while in E. zakharowi they occupy the entire body width. 



For the purpose of separating the species described in this paper 

 from those previously described the following key is appended : 



KEY TO THE SPECIES OP BUCOTYLE COHN, 1904 



1. Vitellaria extending to posterior border of testes 2. 



Vitellaria extending to beyond posterior border of testes 3. 



2. Body 5.6 mm. long by 1.1 mm. wide; testes occupy entire widtb of body; 



uterine coils closely packed E. zakharowi. 



Body 2.4 mm. long by 387^1 wide ; testes separated by width of intercecal 

 space; uterine coils few E. wehri. 



3. Testes elongated but not lobed, entirely extracecal E. nephritica. 



Testes lobed, partly overlying ceca 4. 



Testes X-shaped ; ovary lai-ger than testes ; egg 22/i by lift E. hassalli. 



Testes irregular in shape ; ovary smaller than testes ; egg 43;a by 16/i. 



E. cohni. 

 HEFERENCES 

 COHN, LUDW^IG. 



1904. — Helminthologische Mitteilungen. 2. Arch. f. Naturg., Berlin, vol. 1, 



August, pp. 229-252, pi. 11, figs. 1-16. 

 Ceeplin, F. 0. H. 



1846.— Nachtrjige zu Gurlt's Verzeichniss der Thiere, bei welchen Entozoen 



gefunden worden sind. Arch, f, Naturg., Berlin, vol. 1, pp. 



129-160. 



SivEJABIN, K. I. 



1921. — Gelmintologicheskiia zamietki. Izviest. Donsk. Vet. Inst., Novo- 

 cherkassk, A^ol. 3, pp. 1-7, 1 pi., 3 figs. 

 1920. — Idem. Reprint. 7 pp., 1 pi., 3 figs. Novocherkassk. 

 1924. — Nierentrematoden der Vogel Russlands. Centralbl. f. Bakteriol., 

 etc., Jena, vol. 62, Juli, 15, pp. 80-90, figs. 1-6. 



U. S. GOVERNMENT PRINTING OFFICE: 1930 



