13. 
14, 
15~ 
16, 
17. 
18. 
19. 
21. 
22. 
236 
24, 
256 
26, 
27. 
28. 
296 
30. 
31. 
326 
336 
356 
36. 
‘Eare and hind legs extremely long--lepus flavigularis. SEare and legs not particularly 
long (14). 
fail almost lacking; upper parte dark browmn—-Sylvilaeus gabbi. Tail a conspicuous white 
puff; upper parts light brown-~Sylvilagus floridanus. 
re Dea with sharp spines—~Coendoy mexicanum. Sody covered with ordinary hair or 
fur (16). 
fail naked and scaly for at least half ite length (17). Tail hairy or furry (19). 
‘Pelage with long guard hairs extending above fur—Didenhis parsupialia. Pelage with no 
hairs extending above fur (18). 
Coloration gray--Philander opossum. Coloration red--Caluromys derbdianus. 
Front feet with only three toes; snout very long (20). Front feet with five toes; snout 
no more than moderately long (21). 
Tail short haired; body colored cream and blacsk-~Zgmandua tetradactyvia. Tail long haired, 
bushy; body gray and black--Myrmscophaga tridactyla. 
Sise = vody no more than 300 mm, long (22). Size large, body much more than 300 mn. 
long (27). 
Tail ne ‘te one-half of total length--Sciurus deppei. Tail more than one-half of total 
length (23). 
Red of under parts extending in a band up over the shoulders--Sciurus gureogaster. Red 
of under parte not extending to the upper parte (24). 
Top of 7 between ears red--Sciurus socialis. Top of head between ears like rest of 
back (25). 

Spot of red, buffy, or white at base of ear--Sciurus vyariegatoides. Base of ear same 
color as reset of back (26). 
Under parts gray or black~-Sciurus yucatanensis. Under perts reddish--Sciurus griseoflavus. 
Tail bushy or long haired (28). Tail not bushy, short haired (32). 
Head and neck whitish, rest of body black--Tayra barbara. Head and body same color (29). 
Tail with contrasting rings of black and white or buff (30), Tail plain colored without 
rings (31). 
fail rather short, less than half of total length--Procyon lotor. Tail considerably more 
than half of total length--Jentinksa sumichrasti. 
Legs short; form delicate; size small--Urocyon cinereoargenteug. Lege long; form dog- 
like, not delicate, size large--Canis latrans. 
Body covered with black spots (33). Body plain color, not spotted (35). 
Neck spotted-Felis onca. Neck striped (34). 
Tail long, almost one-half of total length—Jelis wiedii. Tail not long, about one~third 
of total length--Felis perdalis. 
Tail thick and tapering sharply from base to tip--lmtra annectens. Tail about the same 
thickness throughout (36), 
Sise large, body more than 650 mm, long; form cat~like (37). Size smaller, body less than 
650 mm. long; form not cat-like (38), 
161 
