338 



BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



of 913/a ; the protruding posterior part of body is 860/* long. Buccal 

 capsule 35 to 38/x long by 10/* wide ; pharynx 300 to 315/* long by 27/* 

 wide; esophagus 1.4 mm. long by 50/* minimum and 125/* maximum 

 width. Nerve ring 183/* from cephalic extremity. Intestine saccular, 

 filled with black detritus. Anus 332/*, vulva 631 to 664/* from caudal 

 extremity. Vestibule of ovejector with diverticulum or copulatory 

 receptaculum (fig. 402 e) 274/* long. Uteri and ovaries very long, 

 their numerous coils filling the body cavity. Eggs 42 to 50/* by 25/*. 

 The American form of Tetrameres from the chicken, as described 

 above, differs from the two forms reported from other countries from 



/mm 



oimm 



Fig. 402. — Tetrameres Americana, a, Head of male ; b, junction of testis 

 and vas deferens ; c, head end of female j d, junction of uterus and 

 ovary; c, copulatoey receptaculum of female; f, cross-section of female. 

 Original 



that host, T. ftssispina and T . confusa, in numerous respects, as 

 length of buccal capsule, pharynx, and esophagus, distance of anus 

 and vulva from posterior extremity in the female and of cloacal 

 aperture in the male, position of cervical papillae, and length of 

 the diverticulum or copulatory receptaculum of the female. 



Life history. — Probabry similar in a general way to that of T. 

 flssispina (p. 343). 



Distribution. — (North America (United States)). 



Type material. — No. 26382, U.S.N.M. (Bureau of Animal Industry 

 Helminthological Collection). 



TETRAMERES CERTA (Leidy, 188G) Travassos, 1914 



Synonyms. — FUaria dubia Leidy, 1856, not Filaria dubia Creplin, 

 1846; Tropidocerca certa Leidy, 1886. 



Although there is a question as to whether Creplin meant the 

 combination, Filaria dubia, as a specific name, it is in the interests of 



