486 On Three new Forms of Peromyscus. 



Colour. Brownish fulvous, grejer on head and fore- 

 quarters, darker and well-lined with black on back, dull 

 fulvous on sides *. Under surface dull grey (between greys 

 nos. 8 & 9), not sharply defined laterally; a small buffy 

 pectoral spot occasionally present. Hands and feet dull 

 white, the dusky of the ankles encroaching considerably on 

 the metatarsals. Ears blackish, with a scarcely perceptible 

 whitish edge. Tail blackish above, dull white below, the 

 contrast not strongly marked. 



Skull of about the size of that of P. aztecus^ but more lightly 

 built, especially anteriorly ; supraorbital edges square, not 

 angular or beaded ; interparietal large ; palatal foramina 

 variable, particularly long in the type. 



Measurements of the type : — 



Total length 215 millim. ; head and body 97 ; tail 118 ; 

 hind foot, s. u. 21, c. u. 22 ; ear 20. 



Skull: greatest length 28*2; basilar length 21*6; nasals 

 11-5 X 3-3; interorbital breadth 4-2, interparietal 3-9 X 9*4 ; 

 palate length 11"5; palatal foramina 6'8 x 2'3 ; length of 

 iipper molar scries (of another specimen, those of the type 

 being worn to the roots) 4*5. 



Bah. Xometla camp, Mt. Orizaba, 8500 feet. 



Ti/pe. Aged female. B.M. no. 3. 3. 4. 21. Collected 

 19th July, 1902. 



Five specimens from Xometla, besides a rather doubtful 

 young one from the Santa Barbara camp, 12,500 feet. 



This pretty species, which I have named in honour of 

 Mrs. Gadow, who assisted in making the collection, is very 

 different to any known to me. Superficially it looks like a 

 larger long-tailed edition of the more common type repre- 

 sented by P. Cecilii, but has really no relationship to that 

 animal. Perhaps it is allied to P. aztecus, but is entirely 

 without the bright buffy and white contrasts shown by that 

 species. P. gratus, Merr., is much paler, with a far whiter 

 belly, and has a quite differently shaped skull. 



Peromyscus CeciUi, sp. n. 



Characters. Small, with medium ears and licavily furred 

 tail. Like P. melanotis, Allen, but darker throughout, and 

 especially heavily blackened along the dorsal area. 



* A nearly exact idea of the colour may be gained by American 

 zoologists from the fact that a well-marked specimen of Pei-omyscus 

 tpxanus saturatus, Bangs, from the type locality, cannot be distinguished 

 in an upper view by colour of body from among the i'ully developed 

 examples of P. Beaton, though the fur is, of course, woollier and every 

 other character is different. 



