536 LUTRA. 
Fig. LXXVI. LUTRA C. SONORA. MEXICAN OTTER. 
Genl. Char. Size large; hind foot long. Postorbital processes of 
skull slender, attenuate; no diastema between 1st and 2d premolars. 
Color. Above dark brown, changing to pale grayish brown below, 
being whitish on under sides of head and neck; the hairs on head and 
neck above tipped with yellowish brown. 
Measurements. Total length, 1300; tail vertebre, 472; ear, 15. 
Skull: occipito-nasal length, 88.6; greatest zygomatic width, 73.2; 
basal length of Hensel, 96; palatal length, 48. 
506. annectens (Lutra), Forsyth-Major, Zool. Anzieger, XX, 1897, 
p.142. Jd. Ann. Mag. Nat. Hist., 6th Ser., xx, 1897, p. 618. 
CENTRAL AMERICAN OTTER. Nuria in Costa Rica. 
Type locality. Rio de Tepic, Terrotorio de Tepic, Mexico. 
Genl. Char. Premolars small, slender; diastema between first 
and second lower premolars; superior outline inclining downward 
anteriorly, not straight; bull less flat than those of L. canadensis; 
inferior mandibular margin straight. 
Color. Not given. 
Measurements. Skull: basal length, 97.8; greatest breadth, 75-1; 
palatal length, 45.9—-46.5. 
