ODONTOCCELUS. 69 
KEY TO THE SPECIES AND SUBSPECIES. 
A. Size small. 
a. Horns similar in shape to those of O. americanus. PAGE 
a.’ Upper parts pale reddish; tail above black.O. a. texensis 70 
b.’ Upper parts dull fawn; tail reddish brown...O.a.couest 70 
c.’ Upper parts gray brown; tail grizzled white 
IRIE EEIONT IN Ae aN cc Se Ors tuk tee ale Citt arbis. = 4 O. batty. 71 
d.’ Upper parts speckled foxy red; tail foxy red 
oh Se a ee ee Waneueen pict, On Mehnionsteins . 72 
e.’ Upper parts brown, tipped with fawn; 
TU) #2 pg A og 9) Eo | a ae ae oe O. rothschildi 72 
b. Horns slightly lyrate, beams straight. 
a.’ Tarsal gland present. 
a.’ Upper parts bright chestnut; tail above 
RRNA chi krn chins Were ea ato cr ma'n’ » afghan Sats O. trun 73 
b.’” Upper parts mixed black and buff; tail 
OWE CLNTEAINION on )e sce 5 saw bn n\n O. costaricensis 73 
c.’’ Upper parts yellowish brown and gray; 
PAGS BERIVS CUS o ioe a brk'n Weds wie ewes O. nemoralis 74 
b.’ Tarsal gland absent. 
a.’’ Upper parts dark chestnut brown; tail 
POU PMAIW ILS Co sinc ys w sik jer aw wr Sag O. toltecus 74 
c. Horns sloping back on plane of face, tips 
curving inward and forward, with a spike 
from burr on inner side curving inward 
MRE MG NUELE SE RA elt ons ih ann ol gn SPR age ewe Sa RW ns O. thomasi —_75 
d. Horns small subcylindrical spikes ............. O. nelsont 75 
B. Size large. 
a. Horns with a single branch from main tine. .O. cerrosensis 76 
b. Horns with short sub-basal snag, and beam 
curving upward and forming a dichotomous 
fork and again dividing, the normal points 
being five on a side. 
a.’* Upper parts tawny; tail white with black 
SES AUN Senne ee ee eee O. hemionus 76 
b./* Upper parts pale tawny; tail with dark 
median band above, tip black....... O.h. californicus 77 
c.’* Upper parts fulvous; tail whitish, tip 
bate tetra Seite Sy miss ts O.h.eremicus 77 
d.’* Upper parts drab gray; tail, basal half 
dark, middle part white, tip black......... O.h.canus 78 
* Summer pelage described. 
