8 PROCEEDINGS OF THE NATIONAL MUSEUM. vouOB. 



is a distinct species, T, laticoUis, or whether 7'. laticollis is a synonym 

 of T. taeniaeformis. So far as the descriptions are concerned, and 

 in view of the host records from Felidae, including the lynx, there is, 

 if anything, more likelihood that it is a synonym. 



TAENIA LATICOLLIS Radolphi, 1819a. 



Specific diagnosis. — Taenia: Head spherical to club-shaped, about 

 1 to 1.22 mm. in diameter. Rostellum cylindrical to conical, and 600 

 to 700 (x in diameter, sharply circumscribed at its base. A crown of 

 38 to 60 hooks, the large hooks ( ? ) 380 to 420 p. long and with a blade 

 only slightly curved, the handle slightly wavy, and the guard 

 rounded conical in outline with a slight bulge on the side toward the 

 blade. The small hooks (fig. 1) are 150 (?) to 183 [a 

 long with a blade even less curved than that of the 

 large hook, the handle thick and stumpy, rounded 

 oblong in shape, and only slightly longer than the 

 thick, rounded conical guard. The suckers have a 

 diameter of 340 to 400 ^ and are quite prominent. 

 Fig. 1.— Taenia There is no neck, body segmentation beginning inmie- 

 smIll°ho"k. diately back of the head and with no diminution in 

 xiso. attee diameter. The first segments are short, later becom- 

 ing square and finally oblong and longer than broad 

 with a maximum diameter of 2 mm. The length of strobilae ob- 

 served is 50 to 95 mm. Genital pores irregularly alternate and 

 prominent. 

 Male genitalia. — Not described. 

 Female genitalia. — Not described. 

 Hosts. — Lynx lynx {Felis lynx)^ Lynx canadensis. 

 Location. — Intestine. 

 Localities. — Europe, (?) United States. 

 Life history. — Unknown. 



The above description has been compiled from Eudolphi (1819a), 

 Diesing (1850^), Leuckart (1856a), and Liihe (1910, p. 697). Dies- 

 ing repeats Eudolphi's description, Leuckart had some new mate- 

 rial, while Liihe has reexamined Rudolphi's types, without, however, 

 adding more than a few details to our knowledge. Liihe thinks that 

 Taenia novella Neumann, 1896/, is probably identical with T. lati- 

 collis^ but the presence of a distinct neck in T. novella and the shape, 

 size, and number of hooks are all features that relate it to T. pisi- 

 formis, as Neumann noted in describing his new species. Leuckart 

 •states that the hook sizes are almost exactly those of T. taeniae forniL'i, 

 and the figures in the specific diagnosis are made on the basis of this 

 statement. None of the described material has been fully developed, 

 so the important genital structures are unknown. 



