320 Alexander G. Rcthven, 



and dorsal spots vary in distinctness, but they are present in all of 

 our material (47 specimens), even in the largest males. The red 

 Spots on the abdoraen of the males are always very pale (21, 28c) 

 and the blue borders are likevvise pale ('403d, 403c). I find no ac- 

 connt in the literatnre of the fact that the adult females generally 

 have the lips, sides of the neck, and more or less of the sides of 

 the head bright orange red (82). This color is not present in the 

 yonng", is only occasionally indicated in the males, and is absent 

 in some of the adult females, but it is present in nearly all of the 

 latter. It disappears rapidly in alcohol, and probably seldom persists 

 in specimens that have been preserved for any considerable length 

 of time. 



Like Änieiva undidata, this species seems to prefer the more open 

 habitats. It is generally associated with the former in the thickets 

 on the savannall, in the cane fields, in the more open places along 

 the rivers, and in the artifical Clearings. We did not observe it, 

 however, in the dense woods where A. undidata is occasionally found, 

 but we did find it commonly in more open places than are usually 

 frequented by that species. The explan ation lies in the fact that, 

 although a ground lizard. S. variahilis climbs easilj^ on fallen logs, 

 and is very much at home where these are present. Its natural 

 habitat seems to be the margins of the jungle. 



The Contents of the stomaclis examined consist entirely of insects. 



Aineiva undulata (Wiegmann). 



Very common on the plains, and in the mountains about Lake 

 Catemaco. With Sceloporus variahilis the most common ground lizard 

 in the region. 



There is relatively little individual Variation in the large series 

 obtained. In both sexes there is a broad vertebral band of dark 

 reddish brown or reddish olive (89, becoming 84 toward margin; 

 109, 118, 129, 130, 169). This band is offen variegated with black 

 that may form a more or less well defined marginal band. The 

 ground color of the flanks is usually blackish, frequently more or 

 less dark chestnut (118), and extends on the sides of the belly. 

 The ground color of the upper side of the limbs is either like that 

 of the sides or somewhat more brownish, and there are irregulär 

 lighter spots near the color of the vertebral band. The sides of the 

 bind limbs are spotted with bluish like the flanks. The sides of 



