390 3. IGUAN1DJE 



occupies each side of the neck. On the back are undulate 

 cross-bands or large irregular spots of dark brown, usually 

 edged posteriorly with yellow or white. Similar markings 

 are seen on the tail. The head is usually yellow, but may 

 be clouded with slate. Its larger spines are often reddish. 

 The lower surfaces are yellow or yellowish white, uniform 

 or mottled with slate or gray. All markings are usually 

 more distinct in young than in old specimens, but are very 

 variable in both. 



Length to anus 29 74 88 88 92 98 



Length of tail 13 40 40 43 38 47 



Snout to ear 8 15 17 18 18 18 



Width of head 11 26 30 30 30 32 



Length of occipital spine 2 6 10 11 9 9 



Fore limb 14 34 38 39 38 40 



Hind limb 19 44 52 54 52 53 



Base of fifth to end of 



fourth toe 6 14 15 17 15 15 



Distribution. Blainville's Horned Toad is an inhabitant 

 of the coastal slopes of San Diego, Riverside, San Bernar- 

 dino, and Los Angeles counties, California, and the north- 

 western part of Lower California. It has not been col- 

 lected on the desert proper and doubtless does not live 

 there, although it does occur in San Gorgonio Pass, Cajon 

 Pass and Warner Pass, on the western edge of the desert, 

 and even at Warren's Well. 



Intergradation with P. b. frontale occurs in central 

 Los Angeles County, in the neighborhood of Pasadena, 

 Sierra Madre, and Tujunga, Wash. 



It has been collected in Los Angeles (Tujunga Wash, 

 Pasadena, Sierra Madre, La Crescenta, Claremont, Lanker- 

 shim, San Gabriel River near Azusa, Alhambra, San Pedro), 

 San Bernardino (Cajon Pass, Warren's Well, Grapeland, 

 Swart out Canyon, San Bernardino Mountains from 3000 to 



