No. 2322. TREMATODE FAMILY HETEROPHYIDAE— RANSOM. 533 



/Specific diagnosis. — Heterophyes: Length, 1 to 1.3 mm.; breadth 

 0.6 mm. or over (specimens fixed in corrosive sublimate without shak- 

 ing), or length 1.6 to 1.7 mm., width 0.3 to 0.4 mm. (specimens fixed 

 in corrosive sublimate or alcohol, shaken during fixation). Cuticular 

 scales relatively narrow, close together. Ventral sucker very mus- 

 cular and thick-walled, two and one-fourth to two and three- fourths, 

 genital sucker about one and one-half, times as large as the oral 

 sucker. Average diameter of oral sucker, 90 [ji.; of ventral sucker, 

 230 [1 ; of genital sucker, 150 [x. Chitinous rodlets of genital sucker, 

 70 to 80 in number. Intestinal ceca slender, ends passing behind 

 the testes and terminating near the excretory vesicle. Vitellaria con- 

 sisting of about 14 lobules in each lateral field extend forward to 

 about the level of the anterior border of the ovary. Lateral ends of 

 the vitellaria viewed from the ventral side visible beyond the intes- 

 tinal ceca, and some of the lobules often appear to curve around them 

 toward the ventral side. Eggs light brown; about 30 \i by 17 [jl. 



Hosts. — Man ; dog ; cat ; ( ? ) fox. 



Location. — Small intestine and cecum. 



Localities collected. — Egypt, Japan, China. 



According to Looss (1902n) all the specimens of Heterophyes 

 from man examined by him belong to this species, also it is the usual 

 species of Heterophyes found in the dog and occurs in this host in 

 very large numbers, while in the cat it rarely occurs and usually in 

 small numbers. As to the occurence of H. heterophyes in the fox he 

 is uncertain. Specimens of flukes collected from a fox and deter- 

 mined to be Coenogonimus heterophyes by Looss (18996) were after- 

 wards lost, and it is not possible to affirm whether or not they should 

 be placed in H, heterophyes sensu st7'icto. Looss (19027i) recognizes 

 a socalled sentus-iorni of H. heterophyes which is relatively rare in 

 the dog, the cat apparently being the usual host, in several cases hun- 

 dreds of flukes all belonging to this form being present. The largest 

 well-stretched individuals of this form are 1.4 nun. long, 0.4 mm. 

 wide; usual length 0.9 to 1.1 mm., breadth 0.3 to 0.5 mm. Ventral 

 sucker about twice as large as the oral sucker, in young individuals 

 somewhat less, in old individuals somewhat more, than twice as large. 

 Genital sucker about equal in size to the ventral sucker, only in old 

 individuals about one-fifth smaller. Average diameter of oral sucker 

 73 [X, of ventral sucker 146 [x, of genital sucker 112 [jl. Eggs bright 

 yellowish brown in color, brighter than those of H. heterophyes. 



HETEROPHYES PALLIDUS Looss, 1902, 



1902. Heterophyes pallidus Looss, 1902 n, pp. 889-890 (in Milvus aegyptius; 

 Egypt). 

 Specific diagnosis. — Heterophyes: Maximum length of extended 

 individuals 0.95 mm., breadth 0.38 mm,; average length of greatly 



