12 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
The dark color and lack of buffy patches on the sides of the head 
and behind the ears in the Black Sea form are no doubt correlated with 
life in this coastal forest. Apparently A. mystacinus is not closely 
related to A. epimelas of Europe which is sharply distinguished by the 
presence of a fourth minute tubercle at the posteroexternal margin 
of the first and second upper molars. 
Mus muscutus Linné. 
House Mouse. 
Mus musculus Linné, Syst. nat., ed. 10, 1758, 1, p. 62. 
Three skins from Akaba do not seem different from the form of 
House Mouse introduced into the eastern United States. Probably 
at Akaba the typical variety has been introduced by the shipping. 
MUS MUSCULUS ORIENTALIS Cretzschmar. 
Mus orientalis Cretzschmar, Riippell’s Atlas reise nérdl. Afrika. Saugeth., 
1826, p. 76, pl. 30, fig. a. 
Four skins are pale-bellied, yet with conspicuous dusky bases to the | 
white-tipped hairs, and with a buffy line along the sides of the body. 
They are to be considered as representing orientalis though it seems’ 
questionable if they are not better referred to gentilis, of which they 
would be reckoned a dark extreme. The four specimens are from 
Akaba, Arabia, and from Rasheya, Hasbeiya, and Shiba, Syria (near _ 
Mt. Hermon). : 
MUS MUSCULUS GENTILIS Brants. 
White-bellied House Mouse. 
Mus gentilis Brants, Muizen, 1827, p. 126. 
This pale, white-bellied form was taken at Shobek in Arabia and al 
Wady Kerak and El Kerak in Syria. The hairs of the belly are cleat 
white to the base, or with the very base only light plumbeous. Proba- 
bly these are the native form of House Mouse. 
