304 



^Ir. S. and Dr. T.. F. Hirst 



III tlic British Mnsciini collection there is a large disteinled 

 female tick from the Ijtxke. of Chalco, near Mexico, which 

 lias been determined by Prof. Nenmanii as Aiith/i/ommit 

 pt'fosum, Nn. (originally described from the Galapagos). It 

 differs from the female of A. hou^ugeri in having the scutum 

 triangular in shape and much rougher, the pnuctures being 

 larger and closer together. Moreover, the stigmata are some- 

 what different in shape. 



Amhlyomma yiidduin, sp. n. 



f^ . — Scutum longer than broad and oval in shape ; its 

 surface smooth, shining, and furnished with numerous \ery 

 minute punctures, those which are placed near to the lateral 

 margins being a little larger than tliose in the middle. 

 Cervical grooves normal in apj)earance, the superficial poste- 

 rior part short. Postero-median groove represented by a 

 faint dark line. Postero-lateral grooves present, but ill- 

 defined. Marginal grooves represented by very ill-defined 

 and su])erficial depressions, which come to an end in front of 

 the anteriormost festoon. Eyes minute and almost invisible 

 (fig. 5). 



Fij?. 6. 



Fi-r. 5. 



Fifj. .5. — AmhhjoDiina nituhrm, J . 



Dorsal view, x 9. 

 „ „ X 8. 



Ventral surface much furrowed and pitted, especially poste- 

 riorly. Stigmata very broad and roughly triangular in shape, 



liontrum of moderate length, the base finely punctured 

 above, llypostome armed with four files of teeth on each 

 side. 



