124 LIZARDS OF THE PHILIPPINE ISLANDS 



continuous series of small, slightly enlarged, keeled scales, bor- 

 dered by small granular scales ; occipital scales large ; ten upper 

 labials, the last two or three times as long as those preceding; 

 a series of enlarged scales behind and under posterior part of 

 eye; a series of three or four scales forms a longitudinal row 

 from eye to above tympanum; tympanum covered with small 

 scales preceded by a slightly prominent enlarged scale ; a strong 

 longitudinal skin fold on neck surmounted by a serrated nuchal 

 crest usually folded over, forming a wavy line ; ten lower labials ; 

 mental small ; the diverging rows of chin shields very small and 

 not strongly differentiated; scales on chin small and equal; 

 largest scales on back distinctly larger than belly scales ; the six 

 median dorsal rows largest, strongly keeled, the keels forming 

 continuous longitudinal lines ; a row of enlarged irregular scales 

 on each side, strongly keeled, almost continuous, not noticeable 

 on sides of neck; no lateral nuchal crest; about eighteen scale 

 rows across back, between these outer enlarged rows at their 

 widest divergence; gular appendage much longer than head, al- 

 most equal to distance from snout to shoulder; foreleg brought 

 forward the wrist reaches end of snout; hind leg brought for- 

 ward reaches axilla; thirteen or fourteen enlarged scalets form 

 a fringe on posterior aspect of thigh. 



Color in alcohol. — Above metallic lavender-brown to olive 

 brown or gray with darker and lighter areas; neck with bluish 

 cast; no nuchal spot; head darker with an interorbital spot and 

 darker brown markings on snout ; edges of eyelids whitish ; orbit 

 very dark brown or black; a few spots of darker on labials; 

 prominent bluish black spots in temporal region immediately 

 behind orbit; lateral gular appendages, chin, and throat yellow 

 to gray with small spots or reticulations; gular appendage 

 olive gray to yellowish at base; tip bright lemon yellow; wing, 

 membranes yellow with the outer edge dark gray and black; 

 traces of grayish darker lines barely evident; below, uniform 

 yellowish with outer area dark; belly bluish gray to whitish 

 with small darker spots; tail same as body. 



Variation. — Many specimens in the collection vary slightly 

 from these markings. In many the wing membranes are yellow 

 with numerous darker yellow spots on the surface ; the blackish 

 dots on the belly are sometimes absent. In younger male speci- 

 mens the wings show but little yellow and the markings approach 

 those of the female. The brilliant yellow tip on the gular ap- 

 pendage is always present. 



