new Species of Ticks. 303 



A brown speck is present above each eye and a very short 

 dark longitudinal mark on either side of the pale transverse 

 line, a minute central speck being present between these two. 

 The [ostero-median groove and the oblique lateral depressions 

 are also dark in colour. 



Measurements in mm. — Length of scutum 1*75, its greatest 

 breadth 1*4 ; length of rostrum '47. 



? . — Body oval ; the part of the dorsal surface which is 

 left uncovered by the scutum is furnished with numerous 

 short and stout drab-coloured hairs. 



Scutum cordiform. Punctures numerous, fairly deep, and 

 subequal in size. Cervical grooves well-defined and coming 

 to an end at some distance from the posterior margin. Eyes 

 small, flat, and inconspicuous ; they are yellowish in colour 



(% 4). 



Stigmata comma-shaped. 



Rostrum. — Porose areas well-defined and oval in shape; 

 they are separated from one another by an interval which is 

 about equal to their diameter. Hypostome with three files of 

 teeth on each side. 



Legs short. Coxa of first leg with two short spurs ; coxa3 

 of legs 2-4 each with a single very short spur. Tarsus of 

 fourth leg stouter and not so gradually narrowed as that of 

 the male. 



Colour brownish, the hairs of the body drab-coloured. 

 Chitin of scutum dark brown, but covered with a thin layer 

 of pale enamel. 



Measurements in mm. — Length of body 2*5, its greatest 

 breadth 2 ; length of scutum P26, its greatest breadth 1*53 ; 

 length of rostrum '86. 



Material. — Two males (one of which is the type) and a 

 female, from a Tropidurus delanonis, captured on Hood Island 

 (Galapagos). 



A large partially distended female, which probably belongs 

 to this new species, was found on a Tropidurus barrington- 

 ensis from Barrington Island. It agrees closely with the 

 female from Hood Island in most respects, but the body and 

 legs are much paler in colour, the punctures of the scutum 

 closer together, and its posterior end more rounded off. 

 Another female, taken on a Conolophus subcristatus from the 

 Galapagos (exact locality not given), is very similar to that 

 from Barrington Island. 



Remarks. — We have much pleasure in dedicating the new 

 species described above to Mr. G. A. Boulenger. It is owing 

 to his kindness that we have been enabled to examine most of 

 the species which are described in this paper. 



