50. PHRYNOSUMA. 247 
Doliosaurus me’ealli, Girard, U.S. Explor. Exped., Herp. p. 408, and 
U.S. Mev. Bound, Surv., Rept. p. 9, pl. xxviii. figs. 4-6. 
Phrynosoma maccallii, Cope, Proc. Ac. Philad. 1866, p. 310. 
Head as long as broad; nostrils within the canthi rostrales ; 
tympanum covered with scales; six spines on each side of the 
head, viz. a postorbital, four temporals, and an occipital, the latter 
much longer than the longest temporal, quite as long as the hori- 
zontal diameter of the orbit, obliquely directed upwards and slightly 
outwards. A series of very large projecting scales below the lower 
labials ; gular scales smooth, uniform; two short series of small 
Spinose scales on each side of the neck; gular folds several, irre- 
gular. Back with irregularly scattered, large, flat, keeled tubercles, 
which are mostly broader than long; a single lateral series of small 
spines ; pectoral and ventral scales perfectly smooth. Seven femoral 
pores on each side. Tail nearly twice and a half as long as the 
head. Greyish above, with rather indistinct darker spots; lower 
surfaces white, with a few scattered blackish dots. 
millim. millim. 
Total length ...... 108 Fore limb ........ 36 
Cad stained Worgidate 15 Hind limb........ 46 
Width of head .... 15 Wath gi advent sci 37 
BOd Vine) cat seieeuciaes 56 ° 
Desert of Gila and Colorado. 
a. Q. —?P Smithsonian Institution [P.]. 
9. Phrynosoma platyrhinus. 
Phrynosoma platyrhinos, Girard, in Stansb. Exped. Gir, Salt Lake, 
p- 361, pl. vii. figs. 1-5; Bocourt, Miss. Sc. Mex., Rept. p. 232. 
Doliosaurus platyrhinos, Girard, U.S. Explor, Exped., Herp. p. 409. 
Very closely allied to the preceding species, from which it is dis- 
tinguished by the shorter head-spines. The occipital spines are 
only a little longer than the longest temporals and shorter than the 
horizontal diameter of the orbit. Nine or ten femoral pores on each 
side. Sandy-coloured above, with brown marblings or undulated 
cross bands on the back, interrupted on the vertebral line; a large 
brown spot on each side of the nape; lower surfaces white. 
millim. millim 
Total length ...... 121 Fore limb.. ...... 37 
Head estes ad areca 17 Hind limb........ A7 
Width of head .... 17 Pall sg. e ale Soe 41 
Body asco sends oes 63 
Western North America. 
a. 9. Camp 12, Nevada. Smithsonian Institution [P. ]. 
b-d. 2 & yg. Rogne River Valley, Dr. Brown (C.]. 
Oregon. 
