78 LACERTILIA. 
1. Phrynosoma orbiculare. 
a. Var. orbicularis. 
Lacerta orbicularis (part.), Linn. Syst. Nat. 1. p. 265. 
Phrynosoma orbiculare, Wiegm. Isis, 1828, p. 367; and Herp. Mex. p. 53; Wagl. Icon. Amphib. 
t. 23; Sumichrast, Arch. Sc. Phys. Nat. xix. p. 60 (1864) ; and Ann. & Mag. N. H. 3rd ser. 
xiii. p. 507; Boul. Cat. Liz. ii. p. 241. 
Tapaya orbicularis (Girard), Bocourt, Miss. Sc. Mex., Rept. p. 221, t. 11. figg. 1, la-g; Duges, 
La Naturaleza, i. p. 116 (1868); Sanchez, La Naturaleza, vii. p. 323 (1887). 
Phrynosoma wiegmanni, Gray, in Beechey’s Voy., Zool. p. 96. 
Hab. Mexico, city of Mexico (Doorman), Ciudad in Durango (Forrer), Jalisco, north of 
the Rio Santiago (Richardson). 
6. Var. cortezil. 
Phrynosoma orbiculare, Wiegm. Herp. Mex. t. 8. fig. 1. 
Tapaya orbicularis, var., Bocourt, Miss. Sc. Mex., Rept. p. 2238. 
Phrynosoma orbicularis, var., Boul. Cat. Liz. il. p. 242. 
Tupaya cortezit, Bocourt, Miss. Sc. Mex., Rept. t. 11. figg. 2, 2 a-g. 
Hab. Mexico, Jalapa (Hége), Puebla and Orizaba (Mus. Brit.). 
y. Var. dugesil. 
Tapaya orbicularis, var., Bocourt, Miss. Se. Mex,, Rept. p. 224. 
Tapaya dugesii, Bocourt, |. c. t. 11. figg. 3, 3 a-f. 
Phrynosoma orbicularis, var., Boul. Cat. Liz. 1. p. 243. 
Hab. Mexico, Colima. 
3. Var. boucardi. 
Tapaya boucardii, Bocourt, Miss. Sc. Mex., Rept. p. 225, t. 11. figg. 4, 4a-f. 
Hab. Mexico, plateau of Mexico. 
Sumichrast says of this species:—‘ The Phrynosoma, which is peculiar to the cold 
and dry regions of the Mexican plateau, inhabits sandy spots exposed to the sun, such 
as the margins of roads and the arid ridges, where the earthy colour of its body easily 
conceals it from observation. Ill formed for running, it has none of that lizard-like 
vivacity which has become proverbial; its gait is slow and awkward.... Destitute of 
means of defence, it allows itself to be taken without even attempting to bite the hand 
that has seized it.... On several occasions when I have put females of Phrynosoma 
orbiculare into alcohol I have seen the young immediately issue from the cloaca, to the 
number of ten or twelve.” A specimen which I kept for some time would simulate 
death, and although torpid on cool days, would in the heat of the day run rapidly to 
some place of concealment as soon as it thought itself unobserved. Dugés states that 
the number of young varies from fifteen to twenty-four. 
