66 



A. E. SHIPLEY 



Habitat. 



The adult form has been found in the lun^s of 



Urocrotalon catesbyanumi?), Crotalus adamenteus (?), Eunectes scytale 

 [Eu. murimis), Ophis Merremi {Zenodon Merremi), Spilotes pullatus, 

 Lachesis rhombeata {L. mutus) ; in the luugs and kidneys of Boa 

 constrictor ; in the lungs and body cavity of Bothrops juraraca 

 (Lachesis laiweolatus), Crotalus horridus, Boa imperator, Python tigris 

 [Python molurus) ; in the body cavity of the Lizard Podinema tegui- 



xin (Tupinambus tegui- 

 xin) and of F élis leo 

 (Léo nobilis) ; and in 

 the lungs, body-cavity, 

 spleen ând mesentery 

 of Felis pardus. 



Fig. 11. — Porocephalus crotali llumboldt. — A, malc X - ; I^j feniale X ^; 

 C, head of female X 6. 



The larval form (P. subcylindricus) occurs in the liver and 

 abdominal cavity of Didelphys philander, Dasypus niger. Mus pyrrho- 

 rhinus, M. fuUginosus, Phyllostoma discolor ; in the body cavity, 

 thoracic and abdominal, oi Didelphys murina ; in the liver and lungs 

 of Midas chrysopygus ; and encapsuled in the connective tissue and 

 free in the body cavity of Mus domesticus. It also occurs in Procyon 

 cancrivorus. 



Mazza includes in this species the P. polyzonum. of Harley but the 

 différence in the number of the rings and the shape of the hooks 

 justifies us, I think, in keepingthe species distinct. The chief point 

 in v^iiich Macalister's spécimens difïered from the more typical 

 forms is in the indistinct annulation of the front lialf of the body, 



