92 



Tlie subtympanal scale is absent in one specimen only, and as 

 the gular sac is both much smaller and much less brightly 

 colored in the same individual, it is at least possible that tliese 

 may be sexual charactei's. 



GONYOCEPIIALUS DILOPIIUS? 



Lophyrus dilophus, Dum. & Bib?:, Herp. Gen. iv. p. 419, pi. xlvi. 

 Snout rather pointed, shorter than the diameter of tlie orbit ; 

 nostril lateral, niucli nearer to tlie tip of the snout than to the eye; 

 canthus rostralis and supraciliary edge projecting ; tympanum 

 distinct, round, not nearly so large as the eye-oi^eniiig ; upper 

 head scales small, keeled, moi'e strongly so on the supraorbital 

 region, along the inner margin of which there is a semicircular 

 row of enlarged scales ; an oval band of enlarged raised scales on 

 the middle of the snout, the keeling of which is radiate ; the 

 occipital region is bounded on all sides except the anterior by a 

 raised ridge ; it is arcuate behind, and similar in shape and size 

 to the upper surface of the snout, and the enlarged occipital scale 

 is situated near its hinder margin ; most of the scales between 

 the orbit and the tympanum, and an interrupted row round the 

 tympanum much enlarged ; a row of enlarged keeled scales 

 bordering the upper labials ; eleven or twelve upper and a similar 

 number of lower labials ; a row of enlarged scales from the mental 

 shield to l)eyond the angle of the mouth, anteriorly smooth and 

 forming a suture with the first four lower labials, posteriorly 

 strongly keeled and separated from those shields 1)y from one to 

 four rows of smaller scales. Gular sac large, with live large 

 foliate scales in front ; gular scales small, much smaller than the 

 ventrals, strongly keeled, with a few scattered enlai'ged ones 

 intermixed on the sides. Nuchal crest not continuous with the 

 dorsal, formed of four large blunt foliaceous scales, with a few 

 much smaller and more pointed ones in front, and with several 

 rows of enlarged lateral basal scales of unequal size, the anterior 

 of which are keeled, the posterior smooth ; its height is five-ninths 

 of the length of the snout ; dorsal crest formed of equal sized 

 foliaceous scales, similar to, but a little lower than, the nuchal 

 crest. Dorsal scales small, strongly keeled, the points being 

 directed upwards and, in a lesser degree, backwards ; enlarged 

 pyramidal scales on the sides, forming irregular vertical series ; 

 ventral scales niuch larger than the dijrsals, strongly keeled. 

 Limbs with keeled scales of unequal .size ; fourth finger a little 

 longer than the third ; the adpressed hind liml) reaches beyond 

 the snout. Tail strongly compressed, with an upper series of 

 enlarged scales similar, and on its anterior half equal in size, to 

 those forming the dorsal crest ; all the caudal scales keeled, the 

 inferior series largest and elongated, with their keels terminating 

 in a strong sharp spine ; tail of moderate length, witli an abruptly 

 truncated tip, once and two-thirds of that of the head and body. 



