102 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



are situated side by side posterior of the vulva. The eggs (fig. 127), 

 110 by 50 IX in diameter, have a very tliick shell, stippled externally, 

 slightly flattened on one side, and showing an interruption at one 

 end for the exit of the embryo which is covered by a very distinct 



vitelline membrane. 



Hosts. — Sylvilagus hrasili- 

 ensis {Lepus hrasiliensis), 

 Sylvilagus auduboni haileyi, 

 Sylvilagus nuttalli pinetis, 

 Lepus kahilicus, Lepus cali- 

 fornicus melanotis. 



Location. — Cecum (very 

 rarely in small intestine). 



Localities. — Brazil ; Algeria 

 (Winton) ; United States 

 (Amo, IIoAvbert, Monument 

 Park, and Natural Cor rail, 

 Colorado ; Murray County, 

 Oklahoma). 



I am unable to confirm 

 Seurat's statement that the 

 head is larger than the body 

 immediately following it in 

 this worm or that the cervical 

 alae terminate posteriorly at 

 the level of the esophageal 

 bulb. The wide 

 distribution of 

 this species, 

 which was de- 

 scribed from 

 Brazil in ISGG 

 ■and not again 

 noted for 

 .almost half a 

 century, is 

 .i-ather surpris- 

 ing. 



The record 

 from Lepus 



calif ornicus melanotis is based on specimens collected by Mr. Herman 

 Douthitt from a " jack rabbit" in Oklahoma. As the species named 

 ranges all over Oklahoma and is the one i)r()bably involved, accord- 

 ing to Mr. Gerrit Miller, I have assumed this to be the host. 



E 



Fig. 12G.— Dermatoxys veligera. Female geni- 

 talia. After Seurat, 19156. 



Fig. 127.— Der- 

 matoxys VE- 

 LIGERA. Egg. 

 Enlarged. 

 After Seu- 

 rat, 1915b. 



