CROCODILIANS, LIZARDS, AND SNAKES. 513 



covered with line grauuhilious. Lateiiil folds well uuirked, each start- 

 iug- ill front of the arm and ttrmiiiatiiig at the side of the cloaca. 

 Dorsal scales subqnadrilateral, surmounted by a slight longitudinal 

 ridge, forming thirteen or fourteen longitudinal series and twenty-five 

 to twenty seveu transverse ones from the nape of the neck to the pos- 

 terior border of tbe thighs; the cervical series contain but four scales, 

 and not six, as in G. tccniatns. The ventral plates are quite small, and 

 form fourteen longitudinal series at the middle of the trunk. Cloaca 

 bordered with four scales, slightly larger than those which precede 

 them. Tail one third longer than the head and trunk, encircled with 

 twenty-six whorls of scales. Limbs similar to those of G. tceuiatus, 

 both in dimensions and scaling. 



Measurements. — Total length, 250 mm.; length of head from end of 

 muzzle to the middle of ear, 23 mm.; length of head to border of 

 temples, 18 mm.; length of body from chin to anus, 111 mm.; length 

 of tail, 139 mm.; length of arm to the extremity of the middle finger, 

 20 mm.; length of leg to the extremity of the longest toe, 32 mm. 



General tint, a greenish yellow; on the neck and trunk are six trans- 

 verse black bands, very wide on the upper parts, and narrow on the 

 sides where thej* Join and disappear on the belly. On the tail the 

 bands are very wide above, and becon:e faint, narrow lines on the under 

 side. The top of the head is ocher yellow, but the small, tlexible pro- 

 tuberances on the scales are dark brown. The sides of the neck, from 

 the temporal region to the junction of the arm, are black; there are 

 small black spots on the supralabials, another spot, starting behind 

 the eye, extending oblicpiely backward and downward. Lower sur- 

 faces of the body yellow, and the bases of the abdominal scales 

 blackish, 



M. Bocourt distinguishes this species from G. ttviiiatus by the fol- 

 lowing peculiarities: The temporal and nuchal plates are more piomi- 

 neiit, and present the appearance of grains of maize; the lateral scales 

 of the neck and throat are larger and tubercular, while on the reginn 

 above, from the ear to the junction of the arm, the scales are small and 

 granular; linally, the first cervical series is composed of four elevated 

 scales, and not six Hat ones, (iiinther distinguishes it from the G. 

 gramineus, with which Bocourt confounded it, by the following charac- 

 ters: The sides of the neck arecov<,'red with large irregular scales, sep- 

 arated from the nuchal scales by a naked span, with few granules; no 

 granular scales in the lateral fold; dorsal scales considerably smaller, 

 that is, in more numerous rows; ventrals smaller and more numerous. 



Bocourt received this species from Mount Orizaba, where Sumi- 

 chrast found it at an elevation of 3,000 meters. He also reports it from 

 Oaxaca, whence also (iiinther has it. No specimens contained in the 

 U. !S. National iMuseum. 

 NAT Mrs 03 33 



