30 Mamm. 
If. MAMMALIA. 
tive basin- shaped molars, Xerus , and certain African species hitherto 
included in Sciurus , have molars approximating to the Hystrico- 
morphous type, and those of Nannosciurus are decidedly dormouse- 
like. Sciuropterus , with which AEluravus may be identical, is shown 
to be common in a fossil condition ; Sciuroides and Pseudosciurus 
being probably allied types. From these and other considerations, it 
is urged that the Tteromyince are not derived from the Sciurina i, even 
if they belong to the same family. 
Sciurus aberti , n. var. durangi, Thomas, Ann. Nat. Hist. (6) xi, p. 50, 
Durango, Central Mexico. 
Sciurus apache, n. sp., J. A. Allen, Bull. Am. Mus. v, p. 29, Mexico. 
The author, t. c. p. 30, has also a note on S. arizonensis. 
Scmrus nelsoni , n. sp., Merriam, P. Biol. Soc. Washington, viii, p. 144, 
S. Mexico. 
Sciurus vulgaris , for structure of male genital organs, see Pousarques, 
supra, p. 18. 
fSciMrws gceriachensis and gibberosus, n. spp., Hofmann, Abh. geol. 
Reichsanst. xv, pt. 4, pp. 41 & 42, Miocene, Styria. 
Tamias leucurus peninsulce, n. var., J. A. Allen, Bull. Amer. Mus. v, 
p. 197, Lower California. 
Tamias panamintinua , p. 134, T. callipeplus , p. 13G, T. alpinus , p. 137, 
n. spp., Merriam, P. Biol. Soc. Washington, viii, California. 
f Xerus grivensis, n. sp., Major, P. Zool. Soc. London, 1893, p. 191, 
Miocene, La-Grive-St.-Alban. 
f Sciui'opterus albanensis , n. sp., Major, l. c ., ibid. 
Sciuropterus nigripes, n. sp., Thomas, Ann. Nat. Hist. (6) xii, p. 30, 
Philippines. 
Spermophilus : for life-history and distribution of the 5 Mississippi 
species, see Bailey, supra, p. 4, by whom 3 are figured. 
Spermophilus nelsoni, p. 129, California, S. perotensis, p. 131, Mexico, 
n. spp., Merriam, P. Biol. Soc. Washington, viii. 
Spermophilus spilosoma annectans, p. 132, Texas, S. beecheyi Jisheri, p. 133, 
California, S. chrysodeirus brevicaudus , p. 134, California, n. varr., 
Merriam, t. c. 
Arctomys monux : for structure of burrow, see Fisher, supra, p. 8. 
Arctomys marmotta, its distribution and habits ; Langkavel, Zool. 
Garten, xxxiv, p. 1. 
b . Castorid*]. 
f Steneojiber montanus, Scott, Araer. Natural, xxvii, p. 660, Tertiary, 
Montana. 
c. Myoxidjc. 
Eliomys parvus, n. sp., True, P. U. S. Mus. xvi, p. 601, Tana river, W. 
Africa. 
