AEVICOLA. MAMMALIA. 115 



A. Niloticus, Desm. Egyptian Arvicola. Fur brown, mixed with 

 yellow, above y ellowish, gray beneath $ ears large, naked. Mam. 28 1 . 



A. albicaudaius, Desm. Fur brown, with the feet and upper side 

 of the tail white Mam. 281. 



A. vulgaris, Desm. (Mus agrestis, Lin.) The Field Mouse. Of a 

 reddish ash- colour above, paler below ; ears small and round. TCu- 

 rope and Northern Asia Buff", vii. pi. 47* 



A. fidvus, Desm. (Lcmmus fulvus, Geoff.) Aboxit four inches 

 long; reddish yellow; belly and feet paler ; tail not half the length 

 of the body. France Mam. 282. 



A. xanthognatus, Desm. Fur fawn-coloured, variegated with black 

 above, cinereous beneath; cheeks yellowish. Hudsons Bay. 

 Leach, Nat. Mis. i. t. 26. 



A. ceconomus, Desm. {Mus ceconomus, Gmel.) Fur brown above, pas- 

 sing into yellow on the flanks ; throat and belly white ; tail one- 

 fourth the length of the body. Siberia. Pall. Glir. pi. 14, A. 

 These little animals construct their burrows below the surface of the turf in the 

 form of an arched chamber about a foot in diameter. To this chamber they make 

 numerous small holes or entrances, and near this principal apartment they form 

 magazines, in which they deposit in some cases from twenty to thirty pounds 

 of roots, collected by the females during summer for their winter provision. The 

 migrations of this species, like the Lemming, take place in vast phalanxes at 

 uncertain periods, is conducted in the same manner, and is probably caused by exces- 

 sive production and want of food. The natives of Kamtschatka often rob the hoards 

 of these provident little animals, leaving a ridiculous present at the place in return. 



A. saxatilis, Desm. Fur brown, mixed with gray above, deep gray 

 on the sides, cinereous below ; tail as long as the body. Siberia. 

 Pa. 7 /. Gfr,pL23,B. 



A. alliarius, Desm. About four inches long ; fur ash-coloured 

 above, white beneath; ears large, almost naked. Siberia 

 Pall. Glires, pi. 14, C. 



A. rutilus, Desm.. Rather less than the preceding; fur reddish 

 above, dirty white below ; tail a third of the length of the body. 

 Siberia Pall Glires, pi, 14, B. 



A. gregalis, Desm. Fur pale gray on the back, mixed with long 

 black hairs ; belly white ; tail blackish, one-fourth the length of 

 the body. Three inches long. Siberia. Pall. Glir. pi. 17. 



A. socialis, Desm. (Mus gregarius, Lin.) Fur pale gray above, 

 white underneath ; ears short, broad, almost naked. About three 

 inches long ; tail one inch. Deserts near the Caspian Sea. 

 Pall. Glir. pi. 13, B. 



A. Astrachanensis, Desm. Fur yellowish above, cinereous below. 

 Four inches long ; tail one inch. Astracan. Mam. p. 285. 



A. pumilio, Desm. Fur bright brown above, with four longitudi- 

 nal black bands. Cape of Good Hope. Shaw, ii. pi. 133. 



A. hortensis, Harlan. Fur above ferruginous brown, sides lead-co- 

 loured, yellow beneath ; hair coarse ; ears broad, oval. Inhabits 

 Florida. Faun. Amer. 138. 



