50. PHRTNOSOMA. 247 



Dolioaaurus mc'calli, Girard, U.S. Explor. Exjyed., Herp. p. 408, awrf 



U.S. Me.v. Bound. Surv., liept. p. 9, pi. xxviii. figs. 4-6. 

 Phrynosoma maccallii, Cope, Froc. Ac. I'hilad. 18G6, p. 310. 



Head as long as broad ; nostrils within the eanthi 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, obliquelj' 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 

 sjjinose 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. niillim. 



Total length 108 Fore limb 3(3 



Head 15 Hind limb 46 



Width of head 15 Tail 37 



Body 56 



Desert of Gila and Colorado. 

 «• $ • ? Smithsonian Institution [P.]. 



9. Phrynosoma platyrhinus. 



Phrynosoma platyrhinos, Girard, in Stansb. Exped. Gr. Salt Lake, 



p. 301, pi. vii. tigs. 1-5 ; Bocourt, Miss. Sc. Mex., Rept. p. 232. 

 Doliosaurus platyrhinos, Girard, U.S. Explor. E.iped., 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. 



milliin. millim. 



Total length 121 Fore limb 37 



Head 17 Hind limb 47 



Width of head 17 Tail 41 



Body 63 



Western North America. 



a 



5. Camp 12, Nevada. Smithsonian Institution [P.]. 



h-d. $ & yg. Rogue River Valley, Dr. Brown [C.]. 



Oregon. 



