No.i-T,!. THE RIO GRANDE CACOMITL CAT—MEARNS. 209 
Thomas's J^di.'< ydguarondi tolteca, the type of which came from Tete- 
males, State of Sinaloa, Mexico, specimen No. 10018, U.S.N.M., from 
Tehuantepec, Mexico. Although the skull of this specimen is longer 
In' 11 nun. than the type, it agrees with it so closely in proportions 
that it nuist be regarded as probably conspecific. Besides the dif- 
ference in the size of the upper true molar and tirst premolar, which 
are much smaller, the skull is higher and more convex, zygomata 
more massixe, and audital bullse lower and more inflated anteriorh^ 
than in Felis cacomitU. The skull is also remarkable for the great 
postorbital breadth of the braincase and for the brevity of the nasal 
processes of the frontal bones, which end on a line vertically over the 
anterior extremities of the jugals. Felis cacomitU requires no color 
comparison with Felis y<iguarondi tolteca. Mr. Thomas regarded the 
latter as probably the same as Baird's ''' Felis cacomlfJ, Berl. MSS.," 
in the synonymy of F. yaguarandi^ but did not consider the name 
tenable. 
External measuremenU. — Average of two adult females (described 
above): Length, 1060 mm.; tail vertebrte, 480; length of hind foot, 
140; height of ear above crown, 40. 
Craniid viea^surements. — I have used the same cranial measurements 
as Thomas, for convenience of comparison with Fells yaguarondi 
tolteca, those of his type following in parenthesis those of specimen 
No. 35645, U.8.N.M., an adult male of Felis cacomitU from Texas: 
Basilar length of Hensel, 95 (82); zygomatic breadth, 70 (64); least 
interorbital breadth, 20(18); intertemporal breadth, 30(33.5); breadth 
of braincase above auditory meatus, 46 (43); palate, length from hen- 
selion to posterior edge, excluding median notch, 40.7 (36); breadth 
between outer corners of carnassials, 39 (38.7); breadth of posterior 
narial fossa, 13.3 (14); front of canine to back of carnassial, 31 (28.7); 
length of upper carnassial, 13 (11.3); length of lower carnassial, 9 (9). 
x\verage and extremes of four adult females from Texas and Mata- 
moras, Mexico: Basilar length of Hensel, 87.4 (85.5-89); zygomatic 
breadth, 64.5 (64-66); least interorbital breadth, 18 (lT-19); intertem- 
poral breadth, 29.5 (28.5-30); breadth of braincase above auditory 
meatus. 44 (43-45); palate, length from henselion to posterior edge, 
excluding median notch, 36.4 (36-37); breadth between outer corners 
of carnassials, 38 (37-38.5); breadth of posterior narial fossa, 12.9 
(12.7-13); front of canine to back of carnassial, 29.5 (28.5-30); length 
of upper carnassial, 12.5 (12.3-12.8); length of lower carnassial, 8.9 
(8.8-9). 
Proc. N. M. vol. xxiv— 01 14 
