2. COLEONYX 61 



Mulege, Lower California, and Heller secured one at San 

 Felipe. It occurs on San Marcos and South Santa Inez 

 islands, in the Gulf of California. 



It has been taken also in Sonora, at San Miguel de Hor- 

 casitas, and at Tepoca Bay. 



Habits. Very little is known of the habits of this lizard. 

 An individual kept in confinement for more than a year spent 

 most of his time in a hole provided in the ground of his 

 cage. His food during this period consisted entirely of house- 

 flies. His usual time of feeding was after dark, but not in- 

 frequently he would snap up a fly which chanced to stray 

 into the mouth of his burrow during the day, and sometimes 

 would come forth in search of prey while the sun was shining 

 brightly on his den. When stalking flies, his movements were 

 so slow as almost to be imperceptible until he was within 

 range and could seize the coveted morsel with one instan- 

 taneous snap. If blown upon, he would raise himself and 

 stand with legs straight and rigid. When first sent to me, 

 this lizard had the skin of the occiput raised into a large 

 hood, but whether this was a nuptial ornament or due to 

 some accident I cannot tell. 



Diguet states that this lizard lives under stones and in 

 fissures in walls. It emits a faint, squeaking sound when 

 caught. 



Family 3. IGUANID^ 



The members of this family present, in their strange 

 diversity of form, a series of pleurodont lizards which closely 

 parallels in the New World the acrodont Agamidas of the 

 Old. The Iguanidse are diurnal lizards having eyes with 

 round pupils and well developed lids. The tongue is short, 

 thick, and but slightly notched anteriorly. Femoral pores 

 are present in North American species. The clavicle is not 



