1 906 .] .-1 lien, Mammals from Western Mexico. 235 



(27-30); postorbital breadth, 31 (29-33); mastoid breadth, 45.3 

 (42.5-48); audital bulla, 10.7 x I 3- 8 ( I0 X 13-11 X I 5)', pm<-m 2 , 

 21.6 (20-23); sagittal crest, o. 



Middle-aged females, 6 skulls: Total length, 125.8 (124-128); 

 basal length, 109.3 (108-111) ; palatal length, 74.7 (74-76); postpalatal 

 length, 34.7 (34-36); zygomatic breadth, 60.5 (58-62); interorbital 

 breadth, 26.5 (25-27); postorbital breadth, 29.9 (28-32); mastoid 

 breadth, 44.3 (43-46); audital bulla, 10 x TI -9 (9 X n-n X J 3); 

 pm-m 2 , 22 (21.5-23); sagittal crest, o. 



30. Tayra barbara senex (Thomas). 



Two young specimens, Escuinapa, Nov. 10. These specimens, 

 apparently not more than three or four days old, are provisionally 

 referred to this subspecies. They are in an ihteresting stage of growth, 

 but of course too young for satisfactory determination. From the 

 shoulders posteriorly the pelage is wholly deep black ; at the shoulders 

 it is mixed with rufous, passing into nearly uniform rusty brown on 

 the head and neck. There is a small blackish spot at the posterior 

 base of the ear, and an indistinct blackish lateral face stripe. 



3 1 . Lutra annectens Forsyth-Major. 



One specimen, a hunter's pelt, without skull or measurements, 

 Provisionally referred, on geographical grounds, to this species, which 

 was based on a skull from Rio de Tepic, about one hundred miles 

 south of Escuinapa. 



32. Myotis sp. 



One specimen, skin without skull, Escuinapa, Oct. 27. Alar extent, 

 260; length, 51; tail, 30; forearm (in dry skin), 35. Membranes dark 

 brown; ears light brown. 



33. Dasypterus xanthinus Thomas. 



Four specimens, an adult female with two young, and a third 

 young one, Escuinapa, June 26. Alar extent, 337 ; length, 66; tail, 51. 

 The young ones are in formalin. 



34. Balantiopteryx plicata Peters. 



Six specimens, i skin, and 5 specimens in formalin, Escuinapa, 

 July 8, 18. 



