202 VERTEBRATE ANIMALS OF THE UNITED STATES 



Subspecies of P. douglassi 



P. d. douglassi (Bell). In the western and central portion of range. 



P. d. ornatum Girard. In the Salt Lake Valley. 



P. hernandesi (Girard) (Fig. io8). Length 94 mm.; tail 30 mm.; 

 color yellowish or brown, with a row of large, obscure middorsal spots : 

 Colorado and Utah to New Mexico and Arizona; common. 



P. ornatissimum (Girard). Length 124 mm.; color yellowish, some- 

 times pinkish, with 2 rows of large dark brown spots on the back: 

 deserts of Arizona, New Mexico and Colorado. 



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

 tissimum: Wyoming, western Kansas and Nebraska. 



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. m'calli (Hallowell). Length 100 mm.; tail 34 mm.; color gray 

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

 deserts of the lower Colorado; rare. 



Family 4. Anguidae. — Elongated, often more or less snake-hke 

 lizards with weak legs or without any; tongue bifid 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 Angmdae 



El Four legs present i . Gcrrhonotus. 



ao 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. 



6.2 Lower temporal scales keeled G. palmeri. 



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



hi Dark ventral lines on the middle of the longitudinal rows of 



scales G. scincicauda. 



^2 In the southwestern States; scales obscurelv keeled. 



