484 Mr. 0. Thomas oji 



1 + 2 ; seven upper labials, third and fourth entering the eye ; 

 three (rarely four) lower labials in contact with the single 

 pair of chin-shields, which are moderately large and separated 

 from the symphysial. Scales in 17 rows. Yentrals 159 

 to 168 in males, 171 to 186 in females ; anal entire ; sub- 

 caudals 28 to 31 in males, 23 to 25 in females. Coloration 

 very variable. Red above^ with black spots disposed quin- 

 cuncially, or black with red cross-bars continuous across the 

 back or interrupted and alternating ; head reddish brown 

 above with black spots ; a black streak on each side of the 

 Lead, passing through the eye ; body red beneath, largely 

 and irregularly spotted with black, or with a narrow or broad 

 black median band, or with a median series of small black 

 spots ; lower surface of tail uniform red or with a few black 

 spots. 



Total length 430 millim. ; tail 40. 



Several specimens. 



Closely related to A, crassicaudatus, D. & B. Distin- 

 tinguished principally by the greater number of ventral 

 shields. 



10. Petalognathus nebulata, Linn. 



LXIX. — On Three new Forms of Peromyscus obtained hy 

 I)r. Hans Gadoio, F.R.S., and Mrs. Gadow in Mexico. 

 By Oldfield Thomas. 



DUEING their trip last year to Mexico, Dr. and Mrs. Gadow 

 were good enough to collect a number of mammals for the 

 British Museum, and among these there occur examples of 

 three Peromysci which I cannot identify with any known 

 forms and now describe. 



It may also be noted that among the other animals they 

 obtained were four examples, from San Mateo del Mar, 

 Tehuantepec, of a hare precisely agreeing with Wagner's 

 Lepus callotis, \a.v. flavigularis, which had not hitherto had 

 an exact locality recorded for it. 



Peromyscus leucurus Gadovii, sp. n. 



* Characters. Size rather large ; ears large ; tail long and 

 much more hairy than in other Mexican species ; almost 

 comparable in this respect with P. californicus. Pelage 



* Description arranged as in Dr. Merriam's important paper on tlie 

 group. Proc. Biol. Soc. Wash. xii. p. 115 (1898). 



