654 THE FUR SEALS OF THE PRIBILOP ISLANDS. 



This species appears to be closely related to Ixodes ricinus, as determined for me 

 by the late Dr. George Maix, but is larger; the dorsal shield is more perfectly oval 

 and larger; the legs larger and much blacker; as also the head parts and the palpi are 

 shorter, more truncate at apex, and the spiracle is located in a larger, blacker circle. 

 These points, with its extreme difference in host, warrant its description as a distinct 

 species. The description is from a single female which appears to be mature and fully 

 expanded, but not distended to its full limit by development of eggs. 



Both this tick and the louse described above seem to have been encountered here- 

 tofore, as I find in Allen's Monograph of the Pinnipedia (p. 352) the following, quoted 

 from Elliott ; * * * "The seal, in common with all animals, is preyed upon by ver- 

 min, a species of louse and a tick, peculiar to itself," but neither of them appears to 

 have been technically described. 



