130 LIZARDS OF THE PHILIPPINE ISLANDS 



37388 and 37387. The latter specimen differs from the former, 

 which is the type, in having the occipital scales much better 

 differentiated, being rounded plates almost as large as the nasaL 

 The gular appendage is also a few millimeters longer. The color 

 is nearly identical, but there is a very distinct whitish line on 

 the middle of the forehead, and another across the supraocular 

 region. 



Type locality ''Datu Anib's place, near Calagan, northwest 

 Mindanao, at base of Malindang Mountain, 1,100 ft. altitude." 

 Known only from this locality. The types were collected by Dr. 

 E. A. Mearns. 



Genus GONYOCEPHALUS Kaup 



Gonyocephalus Kaup, Isis (1825) 590; (1827) 614; Boulenger, Cat. 



Liz. Brit. Mus, 1 (1885) 282. 

 Lophyurus, part., (non Latreille) Dumeril and BibRON, Erp. Gen. 



4 (1837) 410. 

 Lophosaurus Fitzinger, Syst. Rept. (1843) 45. 

 Dilophyrus Gray, Cat. Liz. (1845) 238; Gunther, Rept. Brit. India 



(1864) 136. 

 Tiaris Gray, Cat. Liz. (1845) 239; Gunther, Rept. Brit. India (1864) 



151. 

 Coryphophylax (Fitzinger) Steindachner, Novara, Rept. (1867) 30. 

 Hypsilurus PpTERS, Mon. Berl. Ak. (1867) 707. 

 Arua DORIA, Ann. Mus. Geneva 6 (1874) 345. 

 Lophosteus Peters and Doria, Ann. Mus. Geneva 13 (1878) 377. 



Body compressed with elongate tail; tympanum distinct. 

 Dorsal scales small, becoming larger laterally, usually intermixed 

 with larger scales. A dorsal crest and a gular fold; male with 

 a small gular sac. No preanal or femoral pores. 



Three species of this genus are recognized from the Philip- 

 pines. They are terrestrial and arboreal. They feed on the 

 ground, on insects and the larvae of beetles, and live for the most 

 part in holes in trees. They are sometimes found under rotting 

 logs, feeding. On being exposed they frequently remain per- 

 fectly quiet, trusting to their coloration to escape observation, 

 and even when touched frequently maintain the same attitude. 

 They readily change their colors and markings. The eggs are 

 usually elongate in shape. 



Key to the Philippine species of Gonyocephalus Kaup. 



a*. Nuchal and dorsal crests continuous; a few scattered enlarged scales 



among dorsals G. sophiae (Gray) (p. 133). 



a\ Nuchal and dorsal crests separated. 



6*. Enlarged dorsal scales forming a row parallel to the dorsal crest; 



scattered scales on sides G. semperi (Peters) (p. 131). 



6'. No row of scales parallel to dorsal crest; scales on sides arranged 

 in irregular vertical rows G. interruptus Boulenger (p. 134). 



