86 BULLETIN 199, UNITED STATES NATIONAL MUSEUM 



Homalosaurus Hallowell, Proc. Acad. Nat. Sci. Philadelphia, 1852, p. 179 

 (type, Homalosaurus ventralis Hallowell). 



Genotype. — Callisaurus draconoides Blainville. 



Range. — Southwestern United States, southward from Nevada to 

 Baja Cahfornia, Sonora, and adjacent islands. 



Species. — One species with 10 forms; only one (C. d. myurus Rich- 

 ardson of Nevada) is extralimital, 



KEY TO MEXICAN SPECIES OF CALLISAURUS 



1. A fringe of small spinose scales along one side of toes somewhat as in Uma. 



draconoides crinitus (p. 87) 

 No such fringe 2 



2. Males with two nearly vertical lateral black blotches usually followed by a 



third black spot; dorsal caudal bars never black, usually with strongly 



undulate or pointed posterior margins draconoides draconoides (p. 86) 



Males with two large oblique lateral black blotches usually not followed by a 

 third black spot; dorsal bars black and undulate or not 3 



3. Dark dorsal bars on tail with strongly undulate or pointed posterior margins 



from base to beyond middle of tail; dorsal tail bars never black. 



draconoides carmenensis (p. 87) 



Dark dorsal bars on tail with nearly straight or slightly undulate posterior 



margins at least from middle to end of tail; dorsal tail bars often black. _ 4 



4. Dorsal tail bars black in both sexes; usually more or less red in dorsal coloration. 



draconoides splendidus (p. 87) 

 Dorsal tail bars black in males only ; usually little or no red in dorsal coloration. 5 



5. Lateroventral black bars in males ill defined, blurred or obsolete, usually united 



below 6 



Lateroventral black bars in males well defined, intense, separate below 8 



6. Lamellae under fourth toe 25-28 draconoides bogerti (p. 89) 



Lamellae under fourth toe 30 or more 7 



7. Lamellae under fourth toe 30 to 33 draconoides brevipes (p. 88) 



Lamellae under fourth toe 35-39 draconoides inusitatus (p. 88) 



8. Femoral pores generally 16 or fewer; hind leg generally 92 percent of body 



length, or more; tail generally 58 percent of total length, or more; inter- 

 parietal and supraorbital semicircles separated completely. 



draconoides gabbii (p. 87) 

 Femoral pores generally 17 or more; hind leg generally 91 percent of body 

 length, or less; tail generally 56 percent of total length, or less; interparietal 

 and supraorbital semicircles usually not separated completely. 



draconoides ventralis (p. 88) 



CALLISAURUS DRACONOIDES DRACONOIDES Blainville 



Callisaurus draconoides Blainville, Nouv. Ann. Mus. Hist. Nat. Paris, vol. 4, 



1835, p. 286, pi. 24, fig. 2, 2a.— Schmidt, Bull. Amer. Mus. Nat. Hist., 



vol. 46, 1922, pp. 646-647, fig. 5, pi. 51. figs. 1-3. 

 Callisaurus draconoides draconoides, Cope, Ann. Rept. U. S. Nat. Mus., 1898 



(1900), p. 272, fig. 24.— Van Denbuegh, Occ. Pap. California Acad. Sci., 



No. 10, 1922, pp. 142-145. 



Type. — Mus. Hist. Nat. Paris; M. Botta collector. 

 Type locality. — "California," here restricted to Cape San Lucas, 

 Baja California. 



