COPEIA 97 



10,5) : "Nor is it \_C. situs] the same as C. copeii Yar- 

 row, from which the new form [C. situs] differs in 

 the same manner as it does from C. tmslizenii"- 

 that is, in being short-headed, while both C. copeii 

 and C. wislizenii are long-headed. Crotaplujtus speci- 

 mens in the American Museum collections from Ti- 

 buron Island in the Gulf of California, and Cerros 

 Island on the Pacific side, are distinctly C. copeii, 

 agreeing with Yarrow's type from La Paz (a single 

 specimen, No. 12663 in the U. S. Nat. Mus.) in be- 

 ing a longer and relatively larger-headed form than 

 any other species of the Crotaphytus wislizenii group 

 known. 



A second good species which has been supposed 

 not valid is Callisaurus crinitus Cope, 1888 (Amer. 

 Nat., Vol. 30, p. 1049). Cope described this from 

 a single specimen, U. S. Nat. Mus. 1489.5, type lo- 

 cality Ballenas Bay in central Lower California on 

 the Pacific side. The American Museum collections 

 contain one full-grown specimen from Abreojos 

 Point, the northern point of Ballenas Bay, and seven 

 full-grown specimens from San Bartolome Bay on 

 the Pacific side, one hundred miles north of the type 

 locality. Callisaurus crinitus is large in size like C. 

 ventralis, and is peculiar in possessing prominent 

 digital fringes, structurally like those in Uma notata 

 Baird. These fringes give an additional indication of 

 close relationship between the two genera. It was 

 Cope's opinion when he first described C. crinitus 

 that its discovery made a union of Uma and Calli- 

 saurus necessary. It is true that these fringes on the 

 toes were perhaps the strongest single character dif- 

 ferentiating Uma and Callisaurus, but the sum total 

 of differences still remains too great to admit of the 

 union. 



Among interesting records in the American 

 Museum material from the Cape Region is Calli- 

 saurus draconoides Blainville, which has had a history 

 of many years' confusion with C. ventralis and of 



