MEXICAN HERPETOLOGICAL MISCELLANY 
SMITH 367 
1 specimen there are 4-6 supercilaries; the series is practically com- 
plete, and separates all the outer supraoculars, and all but the posterior 
inner supraocular, from the orbit. The others have 2 to 4 supercili- 
aries, except in 1, on 1 side of which only the anterior superciliary 
is present (median fused with an outer supraocular on 1 side). One 
specimen has a very small azygous prefrontal. 
Color—Some specimens have faint, narrow, darker brown cross- 
bands, margined irregularly with flecks of white. Others have flecks 
of white scattered irregularly over the back and head. Otherwise the 
coloration 1s a more or less uniform, brownish yellow. 
Comparisons.—This race is very similar to levicollis, having 16 
dorsal scale rows. It differs from that in having at least an anterior 
superciliary (/evicollis never has more than the median superciliary), 
which rarely does not separate the preocular from the anterior supra- 
ocular (preocular always contacts supraocular in levicollis) ; 2 loreals, 
or a single loreal formed of 2 fused scales (an obviously single, more 
or less rounded loreal in /evicollis); loreal always in contact with 
prefrontal (loreal generally separated from prefrontal by contact of 
supraocular and posterior internasal) ; and generally fewer dorsals, 
varying from 40 to 50, average 42.7 (47 to 50, average 49, in /evicollis). 
There is a possibility that this is identical with a specimen described 
by Bocourt as planifrons, from “Oaxaca.” If so the type probably 
bears incorrect locality data, as it now seems very doubtful that the 
species that has been known by the name of Jevicollis (including 
ciliaris) occurs on the Oaxaca highlands. G. planifrons moreover is 
said to have perfectly flat head scales, unlike all others of the ¢mbrica- 
tus group. It may possibly be an aberrant specimen of some other 
species, such as imbricatus, the only other member of the group defi- 
nitely recorded from the Oaxaca region. That no further specimens 
like the type have been collected has no bearing on the validity of the 
species, since the very distinct oawacae also has remained a desideratum 
at least in the collections examined by me. In view of this doubt 
concerning planifrons, I believe it best to retain that name for a 
species distinct from /evicollis; to synonymize the two would require 
a shift of names (since planifrons was the earlier named) not at all 
warranted by present knowledge. 
KEY TO MEXICAN GERRHONOTUS 
1. Arboreal species with flattened heads; dorsals with feeble or no keels, longer 
than broad; lateral fold poorly defined; scales on posterior surface of 
thigh and on sides of neck large granules; adults usually greenish; central 
Mexico to Panama___--- Ceppituevoupes sa= 2 se es es ee ee 2 
Terrestrial species seldom found in trees, with thick heads not flattened 
although frequently widened posteriorly; temporal and supra-auricular 
seales never protuberant; lateral fold moderately to very well defined; 
