small Mammals from North-western Rioja. 419 



a diflferent animal, for it has elongated claws, a purely grey — 

 not rufous or buffy — colour, and is decidedly larger, the hind 

 foot measuring 23 mm., while in the largest of the consider- 

 able series of ffossei now availabhi this measurement is only 

 21 mm., and is generally less. Nor do light ear-patches 

 appear to be present. 



I therefore now describe tlie reddish species as new, and 

 have particular pleasure in connecting with it the name of its 

 captor, now Capt. Philip Gosse, late of the R.A.M.C, to 

 whom in recent years we have been indebted both for a series 

 of the small mammals of tiie war-front at Armenti^res and 

 also for a number of interesting Poona and Nilgiri mammals. 



-^/(•06?o?i ^0556* is readily distinguishable from most species 

 of Alcodon by its warm Evotomys-\'\\.Q colour and the wiiitisii 

 patciies on and round its ears. It is, however, somewhat 

 similar to the A. jucimdus of Jujuy, but has markedly larger 

 teeth. 



6. Abrocoma famCltina, sp. n. 



(?. 951, 956, 960 ; ? . 972, 981. La Invernada. 



" Lives under rocks and in tlieir clefts and fissures." — E. B. 



Ratiier smaller than the other species ; tail shorter than in 

 A. budini, longer than in cinerea. General colour ashy grey, 

 much as in cinerea^ but one specimen is more drabby, about 

 as in tlie type of budini ; in any case, however, the colour- 

 range in the genus is very slight and of but little importance. 

 Under surface paler grey, the tips of the hairs white or pale 

 drabby ; throat darker drabby ; a well-marked whitish sternal 

 gland present in all the specimens, male and female. Ears 

 rather smaller than in other species ; flesh-coloured basally, 

 blackish terminally. Hands and feet white, the latter of 

 normal length, not specially shortened as in A. cinerea*. 



Skull smaller and with shorter nuizzle than in A. budini 

 and cinerea, the distance from the tip of the incisors to the 

 alveolus of ;/ about 1IV8 mm. as compared with about 15"3 

 in the other two. Nasals slender, narrowed behind, but not 

 so markedly so as in budini. Plane of jugals almost as mucli 

 slanted as in budini. Posterior palatal foramina as in the 

 other Argentine species. Bullae about as in cinerea, rather 



* The feet of the typo of A. cinerea were measured by .Sr. Budin and 

 published by mo as 27') mm. in length, but this is certainly longer than 

 they really are. In the dry state they now measure 24'G mm., and would 

 not have exceeded 25 mm. when fresh. Comment was made on the 

 peculiar shortness of the feet, a comment which would have been 

 unjustified had they measured 27 mm. 



2a* 



