112 CALIFORNIA ACADEMY OF SCIENCES. 



hibernating with five Sceloporus oocidentalis and one 

 Eiimeces skiltonianus. 



30. — Gerrhonotus principis (Baird & Girard). North- 

 ern Alligator Lizard. 



Elgaria principis, B. & G., Proc. Ac. Nat. Sci. Phila., 1852, p. 175 

 (type locality Oregon and Pug-et Sound); Gir.^rd, U. S. 

 Explor. Exped., Herp., p. 214, pi. XXII, figs. 9-16. 



Description. — Body long and rather slender, with 

 short limbs and long tail. Head pointed, with flattened 

 top and almost vertical sides, its temporal regions some- 

 times slightly swollen. Rostral plate large, and rounded 

 in upper outline. Behind it, on top of head, follow a 

 pair of small internasals, a pair of frontonasals, a mod- 

 erate-sized or small azygous prefrontal, a pair of pre- 

 frontals, a long frontal, a pair of frontoparietals, two 

 parietals with an interparietal between them, and a pair 

 of occipitals separated by one or usually two or three 

 interoccipitals. Two series of supraoculars and a series 

 of small superciliaries. Upper temporal scales usually 

 smooth and lower two or three series always so. Upper 

 labials much larger than lower. Below latter, two series 

 of sublabial plates, lower much the larger. Gular scales 

 imbricate and smooth. Scales on upper surfaces and 

 sides of neck, body, and tail large, rhomboidal, slightly 

 oblique, weakly keeled, strengthened with bony plates, 

 and arranged in both transverse and longitudinal series. 

 Number of longitudinal series on body fourteen (rarely 

 14| or 16). Number of transverse series between occip- 

 ital plates and back of thighs varying from forty-four 

 to fifty-three. A band of granules along each side from 

 large ear-opening to anus, usually hidden by a strong- 

 dermal fold. Ventral plates about size of dorsals, 

 smooth, imbricate, and arranged in twelve longitudinal 



