No. 2322. TREMATODE FAMILY HETEROPHYIDAE— RANSOM. 535 



HETEROPHYES INOPS Looss, 1902. 



1902. Heterophyes inops Looss 1902n, pp. 887-888 (in Pelecanus onocro- 

 talus; Egypt). 



JSpeciflc diagnosis.— Heterophyes: Largest mature individuals 

 0.46 mm. long. Cuticular scales relatively short and broad with their 

 free edges terminating in a number of very fine points; arranged, 

 especially on the ventral surface of the body, with rather wide 

 intervals between them. Ventral sucker a little larger, the geni- 

 tal sucker in its retracted condition a little smaller, than the oral 

 sucker. Oral sucker, 46 ;;,; ventral sucker, 56 [i; genital sucker, 

 36 [JL in average diameter. Chitinous rodlets of the genital sucker 

 25 to 35 in number, rather widely separated from one another. In- 

 testinal ceca usually rather wide, nonnally extend only as far as the 

 anterior borders of the testes, but may reach nearly to their posterior 

 borders, never beyond them. Vitellaria consisting of 10 to 12 lo- 

 bules in each lateral field extending forward only as far as the level 

 of the posterior border of the ovary, and limited to the dorsal portion 

 of the body near the surface. Eggs about 20 by 10 \i in diameter, 

 shell about 1 [x thick; color never darker than a light yellowish- 

 brown. 



Hosts.— Pelecanus onocrotalus; Milvus aegyptius {=M. parasiti- 

 cus). 



Location. — Small intestine. 



Locality collected. — Egypt. 



This species originally included in H. fraternus was separated 

 from it by Looss (1902w) because of slight differences in the cuticu- 

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

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



HETEROPHYES AEQUALIS Looss, 1902. 



1902. Heterophyes aequalis Looss, 1902n, p. 888 (in cat and dog; Egypt). 

 Specific diagnosis.— Heterophyes : Largest individuals 0.9 mm. 

 long. Average size 0.5 to 0.7 nmi. long by 0.3 to 0.4 mm. wide. 

 Cuticular scales relatively broad and coarse, rather widely separated. 

 Oral sucker and genital sucker almost equal in size, diameter vary- 

 ing in mature individuals between 50 and 60 \i. Ventral sucker 

 somewhat larger, varying between 70 and 90 \i in diameter according 

 to age. Chitinous rodlets of genital sucker 25 to 35 in number, 

 rather widely separated from one another. Intestinal ceca end be- 

 tween the levels of the anterior and posterior borders of the testes, 

 frequently at somewhat different levels on the two sides. Vitellaria 

 only near the dorsal surface of the body, lobules very compact, 10 

 to 12 in each lateral field, extending forward only as far as the 

 level of the posterior border of the ovary. Eggs about 20 by 10 it 



