CHECKLIST OF REPTILES OF MEXICO 171 



KEY TO MEXICAN SPECIES OF AMEIVA 



1. Outer row of ventrals considerably smaller than the others. 



f estiva edwardsii (p. 174) 

 Outer row of ventrals as large as the others 2 



2. Preanal scales in 2 rows 3 



Preanal scales in one row or with no more than 1 posterior scale divided. _ 9 



3. Two rows of granules between third supraocular and superciliaries; third 



supraoculars generally completely separated from frontoparietals by 



granules undulata parva (p. 173) 



A single row of granules between third supraoculars and superciliaries; third 

 supraoculars in contact with frontoparietals anteriorly 4 



4. Median gulars abruptly enlarged 6 



Median gulars little enlarged, gradually merging with lateral gulars 5 



5. Upper lateral vertical light lines from axilla to groin, 12 or more light lines. 



iindulata gaigeae (p. 172) 

 Upper lateral vertical lines from axilla to groin, 1 1 or less light lines. 



iindulata hartwegi (p. 171) 



6. Median gulars irregular or no more than 2 regular (87 percent) ; lamellae 



under fourth toe 28 or more; no upper lateral light stripe, although large 



spots take its place in adult males undulata podarga (p. 172) 



At least 3 median gulars regular (100 percent in all except u. aviphigramma, 

 with 87 percent); lamellae variable; upper lateral light stripe present or 

 absent 7 



7. Dorsolateral dark stripes present except in some large adults, in which the 



upper lateral light spots if present are much narrower than the spaces between 

 them; lamellae on the fourth toe usually (88 percent) 27 or less. 



undulata stuarti (p. 173) 



No dorsolateral dark stripes; upper lateral light spots as wide as or wider 



than spaces between, or represented by a continuous upper lateral light 



stripe; lamellae variable 8 



8. Upper lateral light spots or lines not contacting dorsolateral light area or 



line in adult males, separated by a narrow dark area; lateral gulars not or 



scarcely enlarged undulata amphigramma (p. 172) 



Upper lateral light spots merged with dorsolateral light line in adult males; 

 lateral gulars markedly enlarged undulata thoraasi (p. 173) 



9. Last preanal scale generally (86 percent) divided; lateral markings showing 



little tendency to be arranged vertically; middorsal markings greatly re- 

 duced undulata dextra (p. 173) 



Last preanal scale generally entire; lateral markings tending to be arranged 

 vertically; middorsal markings well developed 10 



10. Upper lateral light spots in adult males large, wider than intervening dark 



spaces; generally (95 percent) 5 or less rows of preanals. 



undulata sinistra (p. 174) 



Upper lateral light spots in adult males small, narrower than intervening 



dark spaces in all males; frequently (65 percent) 6 or more rows of preanals 



luidulata undulata (p. 174) 



AMEIVA UNDULATA HARTWEGI Smith 



Ameiva undulata hartwegi Smith, Proc. Biol. Soc. Washington, vol. 53, 1946, 

 p. 55. —Smith and Laufe, Univ. Kansas Sci. Bull., vol. 31, 1946, pp. 35-30, 

 pi. 2, fig. b. 

 861316—50 12 



