24 University of Michigan 



gular region to many on the gular region and belly, the former 

 being sometimes nearly entirely black. Generally there is a 

 preanal streak of orange yellow. The youngest specimens 

 (38-40 mm.) are pale gray with dull white heads; the dorsal 

 spots are indistinct with the exception of the tail and nuchal 

 spots which are rather better defined and the ventral parts are 

 white with a very few indistinct spots. 



We found this lizard decidedly local in its distribution. It 

 was observed in but two places — north of the town of Carlin to 

 Annie Creek on the flat that extends along the valley of the 

 Humboldt (an area not more than a mile long and a half mile 

 wide), and a low ridge near James Canyon. Although said by 

 the residents to be usually common north of Carlin, we did not 

 find it in numbers; only seventeen adults and thirteen young of 

 the year were taken although the area was worked carefully at 

 various times. One young specimen was captured on the ridge 

 near James Creek, and Mr. George Arthur informed us that he 

 had often seen them there but nowhere else except at Carlin. 



As a rule the horned toads were found during the warmer 

 parts of the day. At night they burrowed beneath the surface of 

 the ground. The adults kept rather closely to the shelter of 

 the bushes, in which situation their coloration is quite protec- 

 tive as they very closely resemble the lumps of earth spotted 

 with shadows which are common in this habitat. The young 

 seem to roam about more than the adults, at least they were 

 more often found in the open. Owing to their form, and the 

 absence of markings they look very much like small lumps of 

 earth in the sunshine. The single stomach examined was 

 gorged with ants and contained small sticks, leaves and stones. 

 The vegetable matter consists of a very few dry fragments 

 and, like the stones, was undoubtedly eaten accidentally. 



As is well known, this species is viviparous. The females 



