390 3. IGUANIDJE 



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. 



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, 

 Swartout Canyon, San Bernardino Mountains from 3000 to 



