A NEW RABBIT CESTODE, CITTOTAANIA MOSAICA. 
By Maurice C. Hat, 
Of the Bureau of Animal Industry, Department of Agriculture. 
The adult tape worms of rabbits have been of considerable impor- 
tance in the history of helminthology, not only from their anatomical 
peculiarities, but from their relation in structure and, probably, life 
history to allied parasites in the horse, cow, and sheep, and from 
their part in the revision of the old cestode genera. 
The Old World genera of rabbit cestodes, Andrya, Anoplocephala, 
and Céttotenia are all Anoplocephaline and hence unarmed. The 
American genera Gertiella and Cittotenia are likewise Anoploceph- 
alinee, while the genus Davainea belongs to the Dipylidiine and is 
armed. | 
Cittotenia is the only genus of rabbit cestodes represented both in 
the Old World and in America. To this genus the new species de- 
~ seribed in this paper is added. 
The author is indebted to Dr. Rufus A. Lyman and Dr. Henry B. 
Ward of the University of Nebraska for the use of Liyyman’s slides of 
C. pectinata, and to Dr. B. H. Ransom, Chief of the Division of 
Zoology, U. S. Bureau of Animal Industry, for assistance in the 
preparation of this paper. The illustrations were made by Mr. 
W.S. D. Haines, artist of the Bureau of Animal Industry, and are 
from camera drawings unless otherwise stated. 
CITTOTANIA MOSAICA, new species. 
Five specimens of Cittotwnia mosaica, new species, were collected 
by the writer from the small intestines of a large “ mountain cotton- 
tail rabbit ” shot July 12, 1906, on the road from Rosemont, Colorado, 
to the Seven Lakes in the Pikes Peak region of the same State. 
From the locality and altitude, the latter over 11,000 feet (3.353 me- 
ters), the host was undoubtedly Lepus pinetis (=Sylvilagus pinetis), 
the form listed for this locality and for high altitudes by Warren 
(1906). In a personal communication, Mr. Warren writes me “I 
PROCEEDINGS U. S, NATIONAL MUSEUM, VOL. XXXIV—No. 1629. 
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