68 



1. D. volans^ p. 70. 



2. D. rcticulatiis^ p. 72. 



I. Draco L. 



(LiNNK, Syst. Nat. I p. 358, 1766). 



Body depressed, with a lateral membrane, supported by the 

 prolonged last five or six ribs and used for gliding through 

 the air; when at rest, the wing-like membrane folded against 

 the body. Dorsal scales irregular, smooth or keeled, with or 

 without enlarged ones. Tympanum distinct or covered with 

 scales. A gular appendage and on each side a smaller one. 

 No femoral or praeanal pores. Tail long. 



Distribution. Indiaj Indo-Australian Archipelago. 



Key to the Indo-Australian species. 



A. Nostril lateral, directed outwards. 



I. The hind limb reaches to slightly beyond 

 the elbow of the fore limb, or not so far. 



a. No spines on the supraciliary border. 



1. Membrane black-spotted below. . . 



2. Membrane unspotted below 



h. A spine on the posterior part of the 



supraciliary border. 



1. Dorsal scales small, subequal; eight 

 or nine (11) upper labials; gulav 



sac as long as the head 



2. A row of spine-like scales along each 

 side at the base of the membrane; 

 thirteen upper labials; gular sac 

 longer than the head 



II. The hind limb reaches at least to halfway 

 between the elbow and the axilla. 



a. Largest dorsal scales twice as large as 

 ventrals. 



1. A series of enlarged, keeled scales 

 along each side of the vertebral line, 

 separated by a row of small, smooth 

 scales; tympanum naked, as large 

 as the eye-opening 



2. Dorsal scales subequal, feebly keeled ; 

 tympanum, if distinct, much smaller 

 than the eye-opening 



Ii. Dorsal scales a little larger than, or 

 as large as the ventrdls. 



D. ror/iufiis^ p. 72. 



4. D. gracUis^ p. 73. 



5. D. iiinorensis^ p. 74. 



6. D. walker i^ p. 75. 



