226 Bulletin American Museum of Natural History. [Vol. Ill, 



Skull: total length, 29.2; basal length (condyle to incisors), 22.9; greatest 

 mastoid breadth, 14 ; least intermastoid breadth, 7.6. These measurements in 

 paradoxus and spilotus are respectively as follows : 32, 31 ; 26.6, 25.2 ; 15.7, 

 14.5; 9, 8.6.- 



The Bee County specimens are thus more than one-tenth smaller 

 than even P.p. spilotus ; the fore limbs are not fulvous to the 

 wrists (except partly so in the young specimen), while the lower 

 surface of the tail is strong fulvous, like the flanks, instead of 

 white or yellowish -white, as in paradoxus and spilotus. 



28. Dipodops compactus (True). 



Dipodomys compactus TRUE, Proc. U. S. Nat. Mus., 1888, p. 160. (Padre 

 Island, Texas.) 



Three specimens, Padre Island, Nueces Co., Texas, skins with 

 skulls, Feb. 19-22, jSSy, J. M. Priour. One of the specimens is 

 very pale ashy gray above, apparently albinistic. 



29. Dipodops sennetti, sp. nov. 



Pattern of coloration as usual in the group. Above strong yellowish ochra- 

 ceous-buff, very much mixed with blackish, the dark tint almost prevailing over 

 the middle of the dorsal region from the crown to the base of the tail, lessening 

 insensibly on the sides and passing into nearly unmixed strong buffy yellow on 

 the flanks. Upper tail stripe dusky brown ; the lower similar but paler, both 

 extending the whole length of the tail. Lateral tail stripes white, continued 

 considerably beyond the vertebrae. Tail slightly crested and penicillate. 



Measurements (approximate from skin) : Total length, 210 mm. (7.20 in) ; 

 head and body, 100 (3.94) ; tail vertebrae, no (4.33), pencil, 20 (.79) ; hind foot, 

 35 (1.46) ; ear, from crown, 9 (.28), from anterior base, 13 (.51). 



Skull, total length, 38.8 mm. ; greatest width, 23.7; nasals, 13.6, as against, 

 respectively, 41, 25.5. and 15 in D. ordii, and 26, 21.3, and 14 in D. compactus. 



Type No. ffff, $ ad., near Brownsville, Cameron Co., Texas, March 9, 1888, 

 J. M. Priour. 



This form is nearest to D. ordii, which it much resembles in 

 coloration, but is rather darker and less golden, the cheeks more 

 mixed with blackish and the dusky eye ring broader, and the tail 

 very differently colored. Compared with one of Dr. Merriam's 

 El Paso specimens (No. $, u - s - Nat - Mus -> kindly loaned 

 me by the Department of Agriculture), forming one of the series 

 of specimens from which Dr. Merriam recently redescribed* the 



* N. Am. Fauna, No. 4, Oct., 1890, p. 45. 



