new Sj?ecies of 'Ticks. 301 



grooves is present behind and in line with the cervicals, and 

 sometimes almost continuous with them ; on each side of this 

 posterior pair of grooves there is a lateral impression, which 

 is well marked in some examples, but indistinct in others. 

 Punctures fairly numerous, but not very deep, and rather 

 unequal in size (fig. 2). 



Stigmata almost comma-shaped. 



Rostrum rather short. Porose areas deep and oval in 

 shape. Hypostome with three files of teeth on each side. 



Legs. — Armature of the coxae of the legs similar to that of 

 the male. Tarsus of fourth leg of different shape to that of 

 the male ; it is stout, rather strongly convex dorsally, and the 

 slope is long but not very steep, the apex being narrowed. 



Colour. — Body dark brown above, the ventral surface 

 yellowish-brown. Scutum very dark brown, with irregular 

 pale patches (which are only visible in the dry examples). 

 Legs the same colour as the scutum and with the distal ends 

 of the segments ringed with white. 



Measurements in mm. — Lengtli of body 4, width of body 

 2*75; length of scutum 1*12, width of scutum 1*6 ; length 

 of rostrum '9. 



Material. — Three males (one of which is the type) and two 

 females, found on an Amblyrhynchus cristatus from Albemarle 

 Island, Galapagos. Three females (and also several nymphs 

 and larvae) from an Amblyrhynchus cristatus labelled Gala- 

 pagos (exact locality not given). Two dry female specimens 

 from St. Paul's Island, which were collected by Charles 

 Darwin, and two dry females labelled Galapagos, also collected 

 by Darwin. 



Remarks. — The specimens collected by Darwin were iden- 

 tified by Prof. Neumann as A. hirtum, Nn. The male of 

 A. darwini, sp. n., is very unlike that of A. hirtum {cf. 

 Neumann's fig. and our fig. 1). The scutum of the female of 

 A. darwini is very much smoother than that of A. hirtum, 

 and the punctures are not so deep and are further apart. 

 We may remark here that all the specimens of A. hirtum, 

 Nn., were collected by Darwin ; according to his labels both 

 the species under discussion occur on St. Paul's Island. 



Amblyomma boulengeri, sp. n. 



$ . — Scutum longer than wide, and slightly narrowed 

 anteriorly. Punctures numerous and very fine. Anterior 

 part of cervical grooves deep and slightly curved ; posterior 

 part very slight and inconspicuous, divergent from that of 

 the opposite side, and extending as far backwards as the 



