174 3. IGUANIDM 



bb*. Tail longer .48 to .51 in male, .46 to .50 in female 5 

 hind leg longer .79 to .88 in female. Central and 

 northern Arizona. 



H. m. campi. 



After study and measurement of our series from Ari- 

 zona, I am unable to distinguish more than one species, beside 

 //. texana. Very great differences in the relative length of 

 tail and hind leg exist, but these seem to me to be individual 

 variations. Thus of 1 7 females, collected in the same gen- 

 eral region from about 5000 to 5500 feet on the desert 

 near the base of the Huachuca Mountains, nine have the 

 tail shorter than the length to anus, two have it equal in 

 length, and six have it longer. Four of these females which 

 each measures 55 mm. from snout to anus, have tails 43, 

 54, 56, and 65 mm. long. Of 12 males from the same 

 region, two have the tail shorter, one equal and nine longer 

 than the length of head and body. Of three males from 

 Cave Creek, Maricopa County, one has the tail shorter, one 

 equal, and one longer than the body length. In females 

 from Tucson, the tail varies from 1 to 1 mm. longer than 

 the length to anus, while in males it varies from ^/2 mm. 

 shorter to 1 7 mm. longer. Nine males from the Santa Rita 

 Mountains all have tails exceeding the length of head and 

 body, by from 2 to 14 mm. Four of these, with length to 

 \ent 59 mm. each, have tail lengths 61, 66, 68, and 70 mm. 

 Specimens exceeding 60 mm. in length to vent are four from 

 Tucson and five from the Huachuca and Santa Rita moun- 

 tains. Great variation occurs also in the length of the hind 

 legs. Those of the two sides of the body may vary as much 

 as 2 mm. Five males each measuring 55 mm. to vent have 

 hind legs 44, 45, 45, 45, and 47 mm. long, and four females, 

 from the Huachucas, with this same body length, have legs 

 38, 40, 42, and 45 mm. long. Three females from Tucson, 

 measuring 58 mm. to anus, have legs 41 J4, 46, and 47^2 



