MEXICAN HERPETOLOGICAL MISCELLANY—SMITH 365 
The liocephalus group is composed of a single widely distributed 
species, which appears to have recognizable races. The names in- 
fernalis, lemniscatus, liocephalus, ophiurus, tessellatus, and ventralis 
have been proposed and are available in this group. I can distin- 
guish three races: l. liocephalus, l. ophiurus, and l. infernalis. The 
elongate body and tail, and the presence of at least two large loreals, 
one following the other, characterize the group; the superciliary se- 
ries is complete, and the azygous prefrontal is large and regularly 
present. 
The caeruleus group, with 11 recognized species and subspecies * 
is the largest of the genus. The 19 names proposed in the group are: 
burnettii, cueruleus, cedrosensis, formosa, grandis, ignavus, kingii, 
marginata, multicarinata, multifasciata, nanus, nobilis, palmeri, pauci- 
carinatus, principis, scincicauda, shastensis, webbii, and wiegmanni. 
Only kingii occurs in mainland Mexico. The group is characterized by 
the absence of the supranasal (fused with first pair of internasals, a 
unique character in Gerrhonotus), regular contact of rostral and 
nasal, and regular presence of an azygous prefrontal. 
The most highly modified group (¢mbricatus) is confined to Mexico, 
so far as known at present. It is the only one that has completely lost 
the azygous prefrontal. Other characters are: Convex head scales 
(except planifrons); reduction of superciliary series, which rarely 
reaches beyond the median outer supraocular, leaving the posterior 
outer and posterior inner in contact with orbit. Seven names have 
been proposed in this group, and one more is added below; of these 
eight, six can be associated with apparently recognizable species and 
subspecies: 72. imbricatus, t. adspersus, 1. levicollis, l. ciliaris, planifrons, 
and rudicollis. Of these the most doubtful are 7. adspersus and plani- 
frons. G. lichenigerus and olivaceus are synonyms of 7. imbricatus. 
GERRHONOTUS LEVICOLLIS CILIARIS, new subspecies 
Holotype-—U.S.N.M. No. 47496, from Sierra Guadelupe, Coahuila, 
collected by E. W. Nelson and E. A. Goldman, April 28, 1898. 
Paratypes—Thirteen. Two topotypes, Nos. 47497-8; Sierra Madre, 
Zacatecas (Nos. 46723-46724) ; Inde, Durango (No. 46843) ; mountains 
near San Luis Potosi, S.L.P. (Nos. 47207-47210) ; and San Felipe, 
Guanajuato (EHT-HMS Nos, 10418-10421). 
Diagnosis.—Like levicollis, with 16 dorsal scale rows, no azygous 
prefrontal and convex head shields, except: Dorsal scales 40 to 50, 
average 42.7 ; 2 superimposed loreals or, if 1, obviously the lower fused 
with upper; loreal in contact with prefrontal; usually 3 superciliaries, 
and always at least an anterior superciliary between preocular and 
anterior supraocular. 
13 Fitch, American Midl. Nat., vol. 20, No. 2, pp. 381-424, 1938, 
469013—42 3 
