AMPHIBIA AND REPTILIA OF COLORADO 6 1 



Ellis, No. 201; Montrose, August 9, 1912 (75 mm.), J. Henderson, No. 202; Rio 

 Florida, near Durango, August 11, 1912 (7 specimens, 60-80 mm.), J. Henderson 

 and M. M. Ellis, No. 203; Grand Junction, August 8, 191 2 (5 specimens, 40- 

 50 mm.), J. Henderson and M. M. Ellis, No. 204; Colorado State Historical and 

 Natural History Museum: Denver, July 31, 1890 (3 specimens, 30-65 mm.), H. G. 

 Smith; Aurora Lake, near Denver, September 3, 1900 (5 specimens, 40-68 mm.), 

 W. C. Ferril; Denver, September 3, 1900 (55 mm.), W. C. Ferril; Julesburg, 

 September 22, 1900 (2 specimens, 60 and 70 mm.), H. G. Smith; Wray, September 

 17, 1903 (4 specimens, 30-80 mm.), H. G. Smith; Durango, September 27, 1905 

 (50 mm.), H. G. Smith; Holly, May 24, 1907 (5 specimens, 40-100 mm.), H. G. 

 Smith; Agricultural College Museum: Ft. Collins, May 10, 1894 (3 specimens, 

 45-50 mm.), L. C. Bragg; State Teachers' College Museum: Greeley, A. E. Beards- 

 ley; reported common in all parts of the state along watercourses. 



Class REPTILIA 



Poikilothermous, air-breathing Vertebrates, with functional lung 

 or lungs, without functional gills, and with a single occipital condyle. 

 Embryo with amnion and allantois. 



A. Body covered with epidermal plates or scales. Order SQUAMATA. 

 B. Bones of the lower jaw firmly united by a bony suture; mouth not 

 dilatable; four limbs present (except in a few forms not represented 

 in the Colorado fauna). 



Suborder Sauria, the Lizards (page 61). 

 BB. Bones of the lower jaw united by ligaments so that the mouth may 

 be greatly dilated; limbs wanting or represented by rudiments. 



Suborder Serpentes, the Snakes (page 81). 

 AA. Body covered by two shields, a dorsal and a ventral, of bony or cartila- 

 ginous plates. Order TESTUDINATA, the Turtles (page in). 

 AAA. Body covered with a heavy leathery epidermis ; size large ; body elongate 

 (not found in Colorado). Order CROCODILIA, the Crocodiles. 



Suborder SAURIA 

 The Lizards 

 Three of the four families of Lizards recorded from the United 

 States are represented in Colorado. These three may be separated by 

 the following key. 



A. Scales on dorsal parts dull, usually keeled; ventral parts covered with 

 scales somewhat larger than the dorsal scales; tongue smooth or covered 



