On new Members of Heteromys and Neotoma. 233 



XXXIX. — On Two new Members of the Genus Heteromys 

 unci Two o/' Neotoma. By Oldfield TiiOMAS. 



In the April number of the ' Annals ' * I had the pleasure ot" 

 describing two new pocket-mice of the genus Heteromys from 

 Mexico and Guatemala, one of them, H. Salvini, representing 

 a new annectant group distinguished by the characters 

 presented by the soles of the hind feet. To this species, 

 H. /Salvini, besides the type from Duenas, Guatemala, a 

 second specimen from Costa Rica was doubtfully referred. 



The Museum has now received from Dr. A. C. Bailer, the 

 discoverer of the Mexican species previously described, another 

 pocket-mouse from a different locality in Jalisco^ and this 

 proves also to belong to the group of which fl. Salvini is 

 typical, and agrees closely with it in size ana cranial cha- 

 racters, but differs considerably in colour. 



On comparing this new specimen with the other two from 

 Guatemala and Costa Rica, it is evident that it represents a 

 new ^pecies of this group, while at the same time a more 

 detailed examination shows that the Costa-Rican animal 

 ought itself to be separated, at least subspecitically, from the 

 Guatemalan. 



Heteromys pictas^ sp. n. 



Size about as in H. Salvini. Colour above coarsely 

 grizzled rufous, the usual black-tipped spines being profusely 

 mixed both on head and body with coarse orange-tipped 

 hairs ; sides brighter rufous, the junction between the dorsal 

 and ventral colours being marked, especially anteriorly, with 

 a bright orange-rufous line, far richer than in any other 

 species. Ears black with white edges. Fore limbs wholly 

 white, except that there is an inconspicuous patch of grey 

 outside the elbow. Hind limbs white on their inner sides and 

 on the top of the feet, dusky on their outer and hinder sides, 

 this colour passing down on to the hairy part of the soles of 

 the feet. {Soles hairy for about one third the total length of 

 the foor ; the naked part with six pads as in H. Salvini, but 

 the minute tifth one is situated rather further forwards, half- 

 way between the fourth and sixth. Tail sharply bicolor, 

 blackish above, white beneath. 



• Ann. & Mag. Nat. Hist. (G) xi. p. 329 (1893). 

 Ann. <L May. N. Hist. Ser. 6. Vol. xii. 18 



