SCIUROPTERUS PLATYURUS. 147 



skulls of the two species under consideration. Both they 

 are adult specimens , all the molars are present. 



The measurements of the skulls in millimetres run as 



lOllOWS : Sc. pearsonii. Sc. setosus. 



length of skull 41 . . 30 



greatest breadth 27 ..17 



nasals 13.5 . . 7 



palate 20 . . 12 



diastema 9 . . 6.5 



length of upper molar series . . 10 . . 5.5 



In comparing the drawings of the skulls (plate 7 , figs. 

 3, 4, 5 and 6) we observe : that in Sc. pearsonii the nasal 

 bones are very elongate and surpass a good deal the in- 

 cisors, meanwhile in Sc. setosus the named bones are stri- 

 kingly short , shorter than in any other Sciuropterus-sipecies 

 known to me ; that the molars in Sc. pearsonii are very 

 stout and represent a type quite different from the feeble 

 and simple molars of Sc. setosus ; that the form of the 

 tympanic bullae is extraordinarily different in the two skulls , 

 in one word that in the bony parts the two species present 

 such enormous distinctions that it indeed is impossible to 

 confound them. 



I was induced to submit our typical Sciuropterus setosus- 

 specimen to a closer examination as I received some weeks 

 ago a small flying-squirrel from Deli , North East Sumatra, 

 through the liberality of Dr. B. Hagen '), who presented 

 it to our Museum. 



From the following it will appear that the latter is a 

 representant of a new species quite distinct from Sc. setosus 

 and which I propose to name 



Sciuropterus platyurus. 



It has the small size of Sciuropterus sagitta , Sc. auran- 

 tiacus and Sc. setosus and is therefore at once distinguished 



1) I remember that I described, in the Notes from the Lejdcn Museum, 

 1889, p. 20, under the name Sc. j^a^ewi, a very large new 5c2Mro/?(?erMj-species, 

 too collected by Dr. Hagen in Deli. 



Notes from the Leyden jVLuseum , Vol. "VTT- 



