98 CALIFORNIA ACADEMY OF SCIENCES. 



I myself have observed this strange performance twice, 

 only in these instances the blood was not projected forci- 

 bly but trickled down the sides of the lizards' heads. 



26 Phrynosoma platyrhinos Girard. DESERT HORNED 

 TOAD. 



Phrynosoma platyrhinos, GIKAKD, Stansbury's Exped. Gt. Salt Lake, 

 1853, pp. 361, 363, pi. VII, figs. 1-5 (type locality Great Salt 

 Lake); STEJNEGER, N. A. Fauna, No. 7, 1893, p. 190, pi. II, 

 figs. 4a-4c. 



Doliosaurus platyrhinos, GIRAKD, U.S. Explor. Exped., Herp., 1858, 

 p. 409. 



Anota calidiarum, COPE, Am. Nat., XXX, No. 358, Oct., 1896, p. 833 

 (type locality " Death Valley, Cal." [uncertain]). 



Description. Nostrils opening above lines joining 

 superciliary ridges with end of snout. Head-spines of 

 moderate size or rather short; five to seven temporals, 

 one occipital, and one or two postorbitals, on each side. 

 Three scales in front of occipital horns much larger than 

 other head-shields. Latter usually almost flat, except 

 just in front of occipital and temporal spines, but 

 roughened with small ridges and granulations. Gular 

 region covered with small granular scales, either uniform 

 or with one series of larger scales at each side. Below 

 lower labials, and separated from them by one or two 

 rows of small scales, is a series of large spinose plates 

 which increase in size posteriorly. Two groups of weak 

 spines on each side of neck, lower somewhat larger than 

 upper. Back, tail, and upper surfaces of thighs bearing 

 scattered, slightly elevated, keeled, tubercular scales, 

 with smaller scales and granules between. A single 

 series of peripheral spines, gradually disappearing pos- 

 teriorly. Tail edged with a row of small spines. Scales 

 on front of the arm large, pointed, and strongly keeled. 

 Those on chest, abdomen, and proximal half of tail 

 smooth. Tympanum usually covered with scales, but 



