1 8&7.] REPTILES AXD BATRACHIAJSS OF CELEBES. 199 



«* Dorsal scales smooth or unicarinate. 



t 38-50 scales round the middle of the body ; no enlarged 

 scale on the heel. 



I No supranasal ; dorsal scales keeled. 



Dorsal and lateral scales strongly keeled 21. Lygosoma tropidonotus. 



Dorsal scales feebly keeled, laterals smooth 22. Lygonoraa nigrilabre. 



\\ No supranasal; dorsal scales smooth. 



7 or 8 supraoculars ; 41 16 scales round the middle of the body. 



23. Lyyosoma sarasinorum. 

 6 supraoculars; 38-40 scales round the middle of the body. 



24. Lygosoma variegatum. 



\X\ Supranasal present ; dorsal scales smooth. 



25. Lygosoma celebense. 



t+ 20-26 scales round the middle of the body ; an enlarged scale 

 on the heel 26. Lygosoma smaragdinwn. 



jS. Lower eyelid with a transparent disk. 



* Limbs not overlapping when adpressed ; no supranasal. 



22 scales round the middle of the body 27. Lygosoma inconspicumn. 



30 scales round the middle of the body 28. Lygosoma textum. 



«» Limbs overlapping when adpressed ; supranasal present. 



24-26 scales round the middle of the body 29. Lygosoma cyammim. 



36-40 scales round the middle of the body 30. Lygosoma atrocostatum. 



*** Limbs not overlapping when adpressed ; supranasal present. 



31. Lygosoma bowringii. 



b. Tympanum distinct, more or less sunk ; fourth toe not longer 



than third. 



Frontonasal usually in contact with frontal ; ear-opening large. 



32. Lygosoma temmincJcii. 

 Praefrontals forming a median suture ; ear-opening small. 



33. Lygosoma parvum. 



c. Tympanum covered with scales 3i. Lygosoma iiifralineolatum. 



d. Tympanum exposed and superficial ; dorsal scales very strongly 



keeled and ending in a sharp point. 



35. Tropidophorus grayi. 



2. Limbs absent (J) or hind pair rudimentary and flap-like (d')- 



36. Bibamus nova-guiiiem. 



IV. SNAKES. 



A. Eyes under the head-shields. 



Prseoeular in contact with the labials ; 20 scales round the body. 



37. Typhlops braminus. 



Praeocular separated from the labials by a small shield; 18 scales round the 

 body 38. Typhlops ater. 



B. Eyes exposed ; aU the teeth solid. 



1. Tail prehensile ; ventral and subcaudal shields present ; pupil vertical. 



a. Upper surface of head with shields ; anterior upper labials pitted ; 

 scales smooth. 



Four upper labials pitted 39. Python reticulatus. 



Two upper labials pitted 40. Python nulurus. 



