Art. VI.3 Herrick-Terry-Herrick, New Mexico Lizards. 141 
This species seems to occupy the entire territory at suit- 
able stations but does not ascend into the mountain canons, 
where its place is taken by C. Collaris. So far from being slug- 
gish, we have found it the most active and wary of our lizards. 
It will fight viciously and devours other species of lizards and 
upon occasion, young of its own species. 
Crotophytus Collaris, Say. 
Plate XXII, Fig. 20. Plate XXIII, Fig. 21. 
Agama collaris. Say, Long’s Exped. Rocky Mts., Harlan. 
Med. Phys. Res. 
Crotophytus collaris, Holbrook, N. A. Herpetology; Wied- 
man. Nova Acta, 1865; Baud, Pacific R. R. Surv. PL XXIV; 
Cope, Proc. Acad. Phila. , 1866; Boulenger, Cat. Liz. Brit. Mus. 
Description : Head large, depressed, much swollen poster- 
iorly, especially in the males; body fusiform; tail long and 
terete; legs very long and strong; plates of head all small, two 
or more series between the granules of the supraocular regions; 
nostrils large and opening laterally; superciliaries small and im- 
bricate; supralabials of about equal size; a large subocular 
plate; ear opening large, oblique, without prominent armature; 
symphyseal plate large, followed by two short rows of some- 
what enlarged plates; one or two well-developed gular folds; 
back and sides covered with small granules; ventral region with 
larger scales; femoral pores from sixteen to twenty-two. 
Color : Upper surfaces olive or browish gray, quite varia- 
ble and variously spotted and barred with lighter color; two 
intensely black transverse shoulder bands which do not meet 
above, the anterior one being interrupted by a V-shaped sepia 
band on the nape; under parts white, the throat and sides mot- 
tled with darker; tail near the end with dark rings. The form 
living in the mountain canons seems to be darker than that oc- 
curing on the upland mesas and the spots are larger and inter- 
rupted by transverse bars. The following description of a living 
specimen illustrates a common type of coloration : 
Head above light brownish gray irregularly bloched with 
sepia; about seven blotches of orange red back of ear; band of 
