SAUEIA-IGUANIDAE DIPSOSAUEUS DOESAL1S. 599 



biting when handled or irritated, but sometimes assumed the offensive, leap- 

 ing to attack to the full length of the cord which confined them. Their 

 behavior was in striking contrast to that of the Horned Frogs picketed with 

 them. The lizards lay sullen, but not cowed, watching every movement 

 of the persons around them with glittering eyes, ready to spring upon an 

 intruder without warning. They clung tenaciously to a stick or the finger, 

 in which they might fix their teeth, and suffered themselves to be suspended 

 in this manner for some time before relinquishing hold. Now and then 

 they seemed to have fits of ungovernable rage, during which they leaped 

 aimlessly about, and tugged persistently at the cord. They refused to eat, 

 apparently from pure chagrin, and all died within a few days. 



24. Crotaphytus wislizeni, Bd. & Gir. 



Crotaphytus icislizenii, BD. & GIR., Proc. Acad. Nat. Sci. Phila,, 1852, 69. lid., 

 Staus. Eep. Exp. Great Salt Lake, 1852, 340, pi. 3. BD., U. S. & Mex. 

 Bouud. Surv., ii, pt. ii, 1859, Eeptiles, 7, pi. 31. Id., P. E. E. Eep., x, 1859, 

 Guuuison & Beckwith's Eoute, Reptiles, 17. Id., ib., x, 1859, Whipple's 

 Eoute, Eeptiles, 37. Coop. & SUCKL., Nat. Hist. Wash. Terr., I860, 294 

 COPE, Proc. Acad. Nat. Sci. Phila,, 1866, 303. COPE, Check-List, 1875, 48. 



Crotaphytus (Gambelia} tcislizenii, BD., U. S. & Mex. Bound. Surv., loc. cit., in text. 



Crotaphytus yambeli, BD. & GIR., Proc. Acad. Nat. Sci. Phila., 1852, 126. 



Crotaphytus fasciattis, HALLOW., Proc. Acad. Nat. Sci. Phila., 1852, 207. Id., Sit- 

 greavc's Exp. Zufii & Col. Eiv., 1853, 115, pi. 5. 



This species, very distinct from the last, and only less beautiful, was 

 found associated with it along the Colorado Chiquito River, where, however, 

 it was less abundant. Its habits and traits appear to be much the same. 

 Its distribution in the West is general, in suitable localities, the species be* 

 ing found as far north as The Dalles in Oregon. 



25. Crotaphytus reticulatus, Bd. 



Crotaphytus reticulatus, BD., Proc. Acad. Nat. Sci. Phila., 1858, 253 (West Texas). 

 COPE, Check-List, 1875, 48. 



This species, originally described from Western Texas, has been 

 recently added to the fauna of the Territory by the Explorations West of 

 the One-hundredth Meridian. (See Dr. Yarrow's report,<mfed.) 



26. Dipsosaurus dorsalis, (Bd. & Gir.) Hallow. 



Crotaphytus dorsalis, BD. & GIR., Proc. Acad. Nat. Sci. Phila., vi, 1852, 126. BD., 

 U. S. & Mex. Bound. Snrv., ii, pt, ii, 1859, Eeptiles, 8. pi. 32, figs. 7-13. 



