VOL. XIX, PP. 57-58 MAY 1, 1906 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



A NEW WHITE-FOOTED MOUSE FROM TEXAS. 

 BY VERNON BAILEY. 



In a recent paper,* I gave the name laceyi to a mouse of the 

 genus Peromyscvs occurring in central Texas. Through a most 

 unfortunate misconception the name was applied to the wrong 

 one of the two species found together at the type locality, to the 

 larger, darker colored form previously named attwateri by Dr. 

 J. A. Allen. The smaller, paler animal is now for the first 

 time described under the name laceianus as a subspecies of pec 

 toralis, its nearest relative. 



Peromyscus pectoralis laceianus subsp. nov. 

 Peromyscus attwateri Bailey, N. Am. Fauna No. 25, p. 99, 1905 not of Allen. 



Type. From ranch of Howard Lacey, on Turtle Creek, near Kerrville, 

 Texas. No. 97,063, male adult, U. S. National Museum, Biological Survey 

 collection. Collected May 3, 1899, by Vernon Bailey. Original number 6860. 



General characters. Tail as long as or a little longer than head and body ; 

 ears large; soles naked except at heels. Similar to pectoralis but with rel 

 atively shorter tail and duller colors and without pectoral spot. Consider 

 ably larger and darker than eremicoides. 



Color. Upperparts dark buffy gray, brightening to rich buff on cheeks 

 and shoulders ; lower parts, feet, and ankles white ; tail sharply bicolor, 

 gray above, white below. 



Skull. Eelatively shorter and wider than in pectoralis, larger and heavier 

 than in eremicoides ; posterior tip of nasals truncate and flush with tips of 

 premaxillae. 



Measurements. Type: Total length, 185 ; tail vertebrae, 95 ; hind foot, 23. 

 Skull of type: Basal length, 22; nasals, 10; zygomatic breadth, 13.5; mas- 

 toid breadth, 11.2; alveolar length of upper molar series, 4. 



Remarks. From Peromyscus boylei attwateri., the other long-taile'd species 

 occurring with it, laceianus differs in smaller size and paler color, white in 

 stead of dusky ankles, more sharply bicolor tail, smaller bullae, and trun 

 cate instead of rounded posterior tip of nasals. 



* North American Fauna No. 25. Biological Survey of Texas, p. 99, Oct., 1905. 

 12 PROC. BIOL. Soc. WASH., VOL. XIX, 1906. (57) 







