244 3. IGUANID& 



to graiules rather abruptly on the dorsolateral region. The 

 caudals are spinose, with some variation in the length of the 

 spines. The dorsals vary from about 68 to 109 in a row 

 from the interparietal plate to a line connecting the backs 

 of the thighs, but seem to average fewer than 100 in all 

 localities from which series are at hand. There may be 

 some geographical variation in the number of dorsals, but, 

 if so, it is largely hidden by individual variation. Thus, 

 counts on a few specimens show Cape Region 78 to 95; Es- 

 piritu Santo Island 88 to 98 5 San Jose Island 86 to 100} 

 San Marcos Island 82 to 109; North San Lorenzo Island 

 84 to 89 ; South San Lorenzo Island 76 to 86; Sal Si Pu- 

 edes Island 82 to 91 5 Tortuga Island 87 to 96 ; Ildefonso 

 Island 92 to 109> San Esteban Island 91 to 96; Monser- 

 rate Island 88 to 95 j Isla Raza 83 to 94 j Isla Partida 80 to 

 89; Angel de la Guardia Island 76 to 86; Mejia Island 87 

 to 90; Las Galeras Islands 87 to 89; Patos Island 89 to 

 95; Tiburon Island 91 to 97; Pelican Island 88 to 92; Te- 

 poca Bay 85 to 94; San Pedro Bay, Sonora, 103, 105; An- 

 geles Bay, Lower California 90 to 99; San Geronimo Is- 

 land 86 to 96; Cerros 96 to 98; Natividad 96 to 98. These 

 counts do not show the extremes of variation for only a few 

 specimens from each locality were counted. 



In this, as in most other lizards, there is great variation 

 in proportions, particularly in the length of the limbs and 

 toes. Sometimes the measurements of the two sides of 

 the same individual vary much. Certainly, species or sub- 

 species based upon small proportionate differences rest upon 

 a most precarious foundation, as may be seen by anyone 

 who will compare the measurements given of specimens of 

 each species. 



Distribution. Ufa stansburiana 'elegans y according to 

 the views of Richardson and Camp, inhabits the whole of 



