636 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 57. 



in diameter, with shell about 1 {jl thick; their color in anterior por- 

 tions of uterus a bright brown, and even in very young individuals 

 with a few eggs, the color is deeper than in H. in-ops. 



Hosts. — Cat (apparently the usual host) ; dog (common in this 

 host, but in small numbers). 



Location. — Small intestine. 



Locality collected. — Egypt. 



This species like H. inops was formerly included in H. fratemus^ 

 but separated from it by Looss (1902n) because of differences in 

 the cuticular scales, extent of the intestinal ceca, relative dimensions 

 of the suckers, and number of chitinous rodlets in the genital sucker. 

 It is a somewhat larger species than H. inops; the ventral sucker is 

 considerably larger, and the eggs are deeper in color. 



HETEROPHYES DISPAR Loose, 1902. 



1902. Heterophyes dispar Looss, 1902n, pp. 888-889, 890, 891 (in dog and 

 cat; Egypt). 



/Specific diagnosis. — Heterophyes: Average length, 0.8 to 0.9 mm., 

 may reach 1 mm. in old fully grown individuals; breadth, 0.3 to 

 0.4 mm. Cuticular scales very large, and separated from one an- 

 other by relatively wide intervals even as far forward as the middle 

 of the body. Oral sucker and genital sucker almost equal in size. 

 Ventral sucker very large; in young individuals about twice, in old 

 individuals almost three times, as large as the oral sucker. Average 

 diameter of oral sucker, 68 \i.; of ventral sucker, 168 ix (transverse) 

 and 146 [l (longitudinal) ; of genital sucker, 72 [i.. Chitinous rodlets 

 of genital sucker about 30 in number, separated by rather wide in- 

 tervals. Intestinal ceca reach the posterior borders of the testes 

 and may extend as far as the wall of the excretory vesicle. Vitel- 

 laria consisting of 10 to 12 lobules in each lateral field, extending 

 forward only as far as the level of the posterior border of the ovary. 

 Eggs about 20 [jl by 10 [x in diameter ; shell about 1 p. thick ; color of 

 mature eggs a deep dark brown. 



Hosts. — Dog (of common occurrence in this host) ; cat (occa- 

 sional host; occurs in small numbers in this host). 



Location. — Small intestine. 



Locality collected. — Egypt. 



Heterophyes dispar was formerly included in H. frateimus., but 

 Looss (19027^) separated it from this species because of its larger size, 

 coarser cuticular scales, its very large ventral sucker, small number 

 of chitinous rodlets in the genital sucker, and much browner color 

 of the eggs. Looss (1902^1) recognizes a limatus-iorm of H. dispar 

 found once in the intestine of a cat in Egypt, 23 specimens being 

 collected. This form is more slender than the usual specimens of 

 H. dispar, measuring 0.85 mm. long by 0.2 to 0.25 mm. wide. The 



