REPTILES 191 



P. d. hrevirostre (Girard) . Length 94 mm. ; color similar to P. d. orna- 

 tissimum: on the northern Great Plains. 



P. platyrhinos Girard. Length 120 mm.; tail 40 mm.; color pinkish 

 gray or brown, with dark cross bands on the back; a large dark patch on 

 each side of the nape; scales small and smooth; tympanum covered: 

 eastern California and the Great Basin from Idaho to Arizona; common. 



P. ni'callii (Hallowell). Length 100 mm.; tail 34 mm.; color grav 

 with a narrow middorsal line with 2 rows of round spots on each side: 

 deserts of the lower Colorado; rare. 



Family 3. Anguidae. — Elongated, often more or less snake-like 

 lizards with weak legs or without any; tongue bihd and extensile; teeth 

 pleurodont; body with a conspicuous lateral fold: about 44 species, in 

 the New and Old Worlds, many in Mexico and Central America, 7 

 in the United States. 



Key to the United States Genera of Anguidae 



ai Four legs present i . Gerrhonotiis. 



a2 Legs wanting 2. Opiiisaurus. 



I. Gerrhonotus Wiegmann. Slender lizards with 2 pairs of weak 

 legs; ears distinct; no femoral pores; tail long and brittle: 19 species, 6 in 

 the United States. 



Key to the United States Species of Gerrhonotus 



ai In the Pacific States. 



bi Dark ventral lines between the longitudinal rows of scales 

 present or absent. 

 Ci Dorsal scales strongly keeled, in 16 longitudinal rows. 



di Temporal scales smooth G. cceruleus. 



d2 Lower temporal scales keeled G. palmeri. 



C2 Dorsal scales weakly keeled, in 14 rows G. principis. 



b2 Dark ventral lines on the middle of the longitudinal rows 



of scales; dorsals strongly keeled, in 14 rows G. multicorinatus. 



a2 In the southwestern States; scales obscurelj- keeled. 



bi Back with alternating black and white bars G. kingii. 



hi Back with a few obscure cross bars G. infenialis. 



G. cceruleus Wieg. Length 290 mm.; tail 180 mm.; color brown or 

 olive with numerous dark cross bands, spotted with white; dorsal 

 scales strongly keeled and in about 16 regular rows: coast region of 

 California, chiefly north of San Francisco. 



G. palmeri Stejneger. Similar to P. cceruleus but much less elon- 

 gated and with a different coloration, being either uniform dark olive 

 brown dotted with black and white on the sides or pale bluish drab 



