148 3. IGUANIDM 



lected at Mulege, San Xavier, San Ignacio, Santa Rosalia, 

 and on Santa Margarita Island, doubtless belong here. 



Remarks. The specimens referred to this name are 

 intermediate in many respects between C. v. ventralis and 

 C. d. draconoldes. The markings on the back and tail are 

 as in C. d. draconoldes^ but the lateroventral black blotches 

 are similar to those of C. v. v entrails, although a few indi- 

 viduals have a third black mark, and some have the blotches 

 less oblique. Some of the specimens from La Pax are 

 typical C. d. draconoldes y but others are indistinguishable 

 from the present subspecies, and various intermediate speci- 

 mens occur there and farther north. I am unable to find 

 any real difference between specimens from various islands 

 in the Gulf of California and those collected on the penin- 

 sula of Lower California. Specimens from Santa Inez Island 

 have the lateroventral black blotches more or less obsolete, 

 but in other respects seem not to be different. 



24. Callisaurus splendidus Dickerson 

 ANGEL ISLAND GRIDIRON-TAILED LIZARD 



Callisaurus dracontoides TOWNSEND, Proc. U. S. Nat. Mus., Vol. XIII, 



1890, p. 144. 

 Callisaurus ventralis VAN DENBURGH, Proc. Cal. Acad. Sci., Ser. 2, Vol. 



5, 1895, p. 97 (part); VAN DENBURGH & SLEVIN, Proc. Cal. Acad. 



Sci., Ser. 4, Vol. 4, 1914, p. 146. 

 Callisaurus draconoid.es ventralis COPE, Report U. S. Nat. Mus, for 1898, 



1900, p. 273 (part). 

 Callisaurus splendidus DICKERSON, Bull. Amer. Mus. Nat. Hist., Vol. 



XLI, 1919, p. 467 (type locality, Angel de la Guardia Island, 



Gulf of California, Mexico); NELSON, Mem. Nat. Acad. Sci., 



Vol. XVI, 1921, pp. 114, 126, 171. 



Description. Head rather short and low, with well 

 developed canthus rostralis. Nostrils large, opening on 



