DUTCH BORNEO-EXPEDITION. 193 



From snout to vent 12,5 cm., total length 50 cm. 



This species (which I dedicate to my friend Dr. J. Bütti- 

 kofer, the zoologist of the Borneo-Expedition) is nearly 

 allied to Ophisaurus gracilis Gray, but differs in the number 

 of longitudinal dorsal series and in the much longer tail. 



One single specimen from Mount Liang Koeboeng. 



23. Varanus Dumerilii Schl. 



One specimen from Nanga Raoen, and a very young 

 specimen collected by Dr. Nieuwenhuis near the river 

 Howong. 



24. Varanus salvator Laur. 



Dried specimens and specimens in spirits from Smitau 

 and Pontianak. 



25. Tachydromus sexlineatus Daud. 

 Several specimens from Mount Kenepai. 



Several of our specimens have three frontonasals in stead 

 of two of these shields, the middle one much smaller than 

 the outer ones, in contact with the internasal as well as 

 with the frontal. In one single specimen this third fronto- 

 nasal is not in contact with the frontal, the two outer 

 frontonasals meeting one another behind the azygos middle 

 shield and separating it from the frontal. In this same 

 specimen the anterior supraocular is not in contact with 

 the loreal, the first supraciliary extending far anteriorly, 

 and so shoving itself between supraocular and loreal. This 

 abnormal specimen agrees in most regards so entirely with 

 the other specimens, that I do not feel inclined to separate 

 it from the named species. 



26. Mabuia multifasciata Kuhl. 



Specimens from Sintang, Smitau and the neighbourhood 

 of the river Howong. 



* 27. Mabuia rudis Boulenger. 



One specimen from Sintang, and one specimen by Dr. 

 Nieuwenhuis from Bloe. 



28. Lygosoma Bilttihoferi, no v. spec. 



Section Hinulia. Body elongate, limbs well-developed, the 

 distance between the end of the snout and the fore limb 



Notes from the Leyden Museum, Vol. XXV. 



