Dendromus, Dipodillus, and Gerbillus. 61 



account of its general resemblance to D. simoni, Lataste, 

 from near tlie same region. But I now see that its longer 

 tail, smaller skull, smaller teeth, and proportionally larger 

 bullsB indicate that it is not really relatrd to that animal, but 

 is an Algerian ally of the Lower Egyptian D. marice, Bonb., 

 and D. henleyi, de Wint., from both of which it differs by its 

 larger size. I have named it in honour of its caj)tor, 

 Dr. Jordan, of Tring, to whose efforts in collecting Algerian 

 small mammals the National Museum is so largely indebted. 



Dipodillus arabium, sp. n. 



Allied to D. famulus, but with less heavily tufted tail and 

 even larger bullae. Sides not completely naked. 



Size rather smaller than in famulus. General colour of 

 the same soft drabby fawn, darker on the back, paler and 

 clearer on the sides. Top of nose with scarcely a trace of 

 a dark nose-patch. White patches over eyes and behind 

 ears well marked. Ears rather short, their proectote coloured 

 like the head, not darkened. Hands and feet white as usual. 

 Soles essentially naked, but there are a number (twenty to 

 thirty) of small hairs on the terminal third, upon and between 

 the pads, thus showing an approximation to the condition in 

 Gerbillus; pads six in number, the proximal ones small. 

 Tail rather shorter than in famulus, well-haired and tufted as 

 compared with most members of the group, but with nothing 

 like the remarkable tuft found in famulus ; whitish below 

 and on the sides, its upper surface mixed brown and fawn, 

 the terminal tuft brown, but perhaps like that of famulus 

 black when unbleached. 



Skull with narrow interorbital region, low and broad 

 brain-case, and bullae even larger, though very slightly so, 

 than in I), famidus. 



Dimensions of type (measured in flesh) : — 



Head and body 86 mm. ; tail 140; hind foot 24; 

 ear 13"5. 



Skull: greatest median length 28*7; greatest diagonal 

 length 29'5 ; condylo-incisive length 25*6 ; zygomatic 

 breadth 15 ; nasals 10'8 ; interorbital breadth b'2 ; breadth 

 on lip of meatus 15"8 ; palatal foramina 4*6 ; greatest 

 diagonal horizontal diameter of bullse 11*2 ; upper molar 

 series 3*7. 



Hab. Tebuk, on the Hedjaz Railway, Arabia. Air. 2000'. 



Type. Adult male. B.M. no. 10. 3. 12. 1. Original 

 number 7. Collected 3rd January, 1909, by Douglas 

 Carruthers. Two specimens. 



