DESCRIPTION OF A NEW SPECIES OF AGAMID LIZARD 

 FROM THE MALA.Y PENINSULA.. 



By Doris M. Cochran, 



Aid, Division of Reptiles and Batrachians. 



The species described below introduces apparently for the first 

 time to the Malay Peninsula fauna a member of the group of the 

 genus GonocepJialus represented by the type species GonocepJialus 

 chamaeleontinus. This group, which is characterized by the supra- 

 ciliary border being strongly raised and forming an angular projec- 

 tion posteriorly, has hitherto been known only from species occurring 

 in Java, Borneo, Sumatra, and some of the adjacent smaller islands j 

 The interesting point is that the new species seems to be more 

 closely allied to the Bornean Gonocephalus doriae than to the Java- 

 Sumatran Gonocephalus chamaeleontinus. 



GONOCEPHALUS ABBOTTI, new species. 



Diagnosis. — Supraciliary border strongly raised, forming an an- 

 gular projection posteriorly; no enlarged scales on sides of back or 

 on temporal region; scales of row next to median series of enlarged 

 nuchal and dorsal crest-scales large, flat, without keel or spine; 

 dorsal crest continuous with and lower than nuchal; third and fourth 

 fingers of equal length. 



Description. — Adult female, U.S.N.M. No. 24028; Trang, Lower 

 Siam; Dr. W. L. Abbott, collector. 



Head high, with strongly elevated supraciliary borders forming 

 an angle posteriorly; snout as long as the diameter of orbit, ending 

 in a pronounced rounded hump; no indication of supraorbital semi- 

 circles; scales between eyes and on snout only slightly smaller than 

 those of supraorbital region; a few large, perfectly flat median 

 scales on top of snout; tympanum smaller than eye-opening; sides of 

 head covered with smooth scales about as large as the average dor- 

 sals; no enlarged scales on temples or body; 12 upper and 13 lower 

 labials; gular sac well developed, with serrated anterior edge; gular 

 scales much smaller than ventrals, smooth; body very strongly com- 

 pressed; nuchal crest beginning on occiput; nuchal and dorsal crests 

 perfectly continuous, gradually decreasing in height from above 

 tympanum to the tail; no depression in the crest above shoulders; 

 crest-scales smooth, triangular, nearly as wide as high, nuchals con- 

 vex on front, concave behind; first (upper) row of scales covering 

 base of crest composed of irregularly pentagonal flat scales as large 



No. 2421, Proceedings U. S. National Museum. Vol. 60, Art, 26. 



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