692 PROCHEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIV. 
have no hesitation in saying that a cottontail taken at the locality 
@> you mention would be Lepus pinetis.” 
> In a later paper, Warren (1908) lists this 
host as Sylvzlagus pinetis. 
Cyn I have found only two references to rab- 
bit cestodes from Colorado. ; 
One is an article by Curtice (1892), in 
which he writes: “ In Colorado, cottontail : 
rabbits (Lepus sylvaticus Bachman) yield- 
ed in 1886 an undescribed Taenia.” TI have | 
not been able to locate these specimens. 
In looking over the files of a sheep 
breeder’s periodical I find a note by a con- 
tributor signed “D. K.” (1900), who 
writes from some unspecified locality in 
Colorado as follows: “ Nearly every rabbit 
here has tapeworms in it.” 
The specimens of C. mosaica were much 
folded in the intestine, but were readily 
straightened out after fixation. The lengths 
of the cestodes were as follows: 5.3 cm., 
(iH) Ci, (H) Cite, Ss0 Cid. Mac! 10) can, Woe 
: proglottids are much broader than long, 
== the maximum breadth being 8 to 10 mm., 
zee the maximum length of end proglottids 1 
fae mm., and the maximum thickness 2 mm. 
Rees Viewed from the dorsal or ventral surface 
Bnew Oar inearece toward the head and especially in the pos- 
See terior part of the strobila, the separate 
garcons proglottids show several irregularities, 
ES constrictions, and depressions across their 
oe breadth, giving the broad surfaces some- 
what the appearance of a mosaic, whence 
Pee gee ook Ube specie mem: (ig, 1.) 
MARICING. The unarmed head is dome-shaped and 
is actually and relatively small. (Hig. 2.) It measures 270 to 350 p 
in breadth at the base and 110 to 240 » from 
the base to the tip, according to the state of 
contraction. The four small suckers are set 
far anterior and measure at the aperture 20 
to 44 ». There is no neck, segmentation be- 
ginning directly behind the head. The stro- 1/10 mm, ; 
bila: broadens rapidly, and) becomes) lance- 16s 2a ie ON aD ae, : 
SUCKERS. = 
olate in outline. | 
A study of the internal anatomy readily establishes the specific £ 
distinctness of this form, and I have adapted the following key from 
