470 PULEX KERGUELENSrS. 



the dorsal plate of each abdominal segment there is a slightly 

 curved row of longer bristles close to the posterior margin 

 and in frout of it a large number of shorter hairs which 

 are arranged in 5 — G irregular longitudinal rows. This 

 is similarly repeated on the ventral plates; only the hairs 

 are not quite so numerous, though very numerous still in 

 comj)arisou to other species. The pubescence is especially 

 dense on the inferior and posterior surface of the last seg- 

 ments. There are 3 — 5 more or less regular rows of 

 bristles on the thoracical segments as on the abdomen. 

 The head too is similarly provided with a large number 

 of short hairs, which are everywhere of a light colour. 

 The adhesive disk at the apex of the abdomen in the 

 male is very large and semiovate, and provided at its free 

 margin with rather long bristles, which are very regularly 

 placed. 



The thick first tarsal joint of the fore legs is of the 

 same length as the fifth joint, which however is much more 

 slender; the second joint is not considerably shorter than 

 the first or fifth, the third somewhat shorter than the 

 second, and the fourth again a little shorter than the 

 third. The second tarsal joint of the middle legs is equal 

 in length to the fifth , and to the third and fourth toge- 

 ther ; the first joint is somewhat longer. The first tarsal 

 joint of the hind legs surpasses the second l)y a third of 

 its length , the third and fourth together are somewhat 

 shorter than the second , and the fifth somewhat longer 

 and more slender than the third. 



Length of the male 2 mm., that of the female 3 — 4^/2 mm. 



The four specimens examined were collected the 16*^ Oc- 

 tober 1874 by the Rev. A. E. Eaton on Kerguelen-Island 

 (Royal Sound), at the occasion of the Expedition for the 

 observation of the Transit of Venus , infesting a specimen 

 of Pelecanoides urinatriv Gmel. 



Halle a. S., April 1880. 



Notes from the Leyden UVTuseuin , "Vol. II. 



