214 PROCEEDINGS OF THE NATIONAL MUSEUM vol.83 



ured along longitudinal axis of strobila. Vagina posterior to cirrus 

 pouch, lined with ciliated cells; seminal receptacle variable in size, 

 125ju, to ITOju, long and 50/x to Gljw wide. The structure considered 

 herein as the so-called shell gland is relatively inconspicuous, 30/^ 

 to GO/i in diameter. Uterus at first an approximately straight tube, 

 later developing wide outpocketings, these becondng reduced to more 

 delicate lateral branches, 4 to 10 (frequently 8) in number on each 

 side; uterine branches sometimes (pi. 19, fig. 2) taking on the appear- 

 ance of " drooping " branches. Eggs about 25ja b}^ 28)U to 35/x. 



Larva Avith large terminal bulblike bladder about 8 mm long and 

 6.5 mm wide, transversely striated (pi. 20, fig. 4) ; body of larva 

 about 11 nun long and 2.5 mm in maximum width. 



Hosts. — Definitive : Lynx ruftis rufus., L. r. calif ornicus, L. r. 

 fasciatvs, L. r. umta, Felis concolor azteca., F. c. hippolestes., F. o. 

 oregonetisis; intermediate : Odocoileus columManus scaphiatus, O. 

 hemionus heinionus, and O. virginiarvus macrourus. 



Location. — Small intestines of definitive host; lungs and peri- 

 cardium of intermediate host. 



D Istrihittion. — United States (Arizona, California, Colorado, 

 Idaho, Minnesota, Montana, New Mexico, North Carolina, Oregon, 

 Utah, Virginia, and Washington). 



Life history. — The hooks of larval forms found in Odocoileus 

 columhianus scaphiatus, O . hemionus, and O. virginianws are similar 

 to those of the adult cestode. While experimental evidence as to the 

 life history is lacking, the shape and size of these hooks appear to 

 constitute a specific character, and this morphological character sug- 

 gests that these larvae found in the deer develop to an adult form 

 in the carnivores listed as definitive hosts when infested deer are 

 eaten by these carnivores. The deer presumably become infested by 

 ingesting the eggs in contaminated food or water. 



Cysticerci attached to the liver of Perojiiyscus rnaniculatus nubri- 

 terrae from Sevier County, Tenn., show hooks similar to those of 

 Taenia lyncis in shape and size. Both the host and the location 

 of these C3^sticerci indicate that evidence based upon successful ex- 

 periments with the life history of this worm is needed before a spe- 

 cific determination can be made. These specimens were collected 

 by E. V. Komarek, of Thomasville, Ga. 



The hooks, especially the small ones, which are unlike those of 

 other carnivore cestodes known to me, on account of their long taper- 

 ing handle and long bifid guard serve as the best character for spe- 

 cific determination. This species has frequently been found in the 

 same host wdth Taenia macrocystis. 



