468 DE. F. LEUTHNEE ON THE ODONTOLABINI. 



Mandibles. 



1. Forma telodonta. — At present unknown. 



2. Forma mesodonta (fig. 6). — Corresponds to form a of 0. castelnaudi (comp. fig. 2). 

 Mandibles as long as the head, moderately curved, with three or four series of teeth 

 at the tip, followed by two small obtuse teeth, and then by the central tooth. Head 

 with no raised frontal crest ; clypeus resembling an epistoma, as in 0. hrooJceanus. 



3. Forma ampModonta (fig. 7). — Similar to the same form of 0. castelnaudi (fig. 4) 

 and 0. hrooJceanus (fig. 14). Flattened, finely punctured. Mandibles with four or five 

 apical teeth, and two basal ones. 



4. Forma ])riodonta. — Flattened, with five or six irregular teeth on the inside (fig. 8). 



Female. Very like that of 0. brookeanus in size, shape, and coloration, but the 

 females are not so constant in coloration as the males. The four females from Banka 

 and Sumatra which I have examined are all dissimilar, but the under surface is deep 

 black in all, whereas it is pale brown in every specimen of 0. brookeanus (?) which I 

 have seen. In three specimens from Sumatra the prothorax is dark brown, and the 

 triangular spots at the tip of the elytra are paler in two of them, so that there are 

 only two dark spaces left at the base, whereas the single specimen from Banka (fig. 12) 

 nearly agrees with 0. brookeanus (?) in the colour of the prothorax. 



Number of specimens examined : twenty-one males and four females from both 

 localities, in the collections of Messrs. van Lansberge and Parry (types), and in the 

 Leyden Museum. 



Habitat. Eastern Sumatra and the adjacent island of Banka, between Sumatra and 



Borneo. 



Measurements. 



This very interesting species, strange as it may at first seem, is intermediate between 

 the largest form of 0. castelnaudi and the Bornean 0. brookeanus, but it is always 

 misnamed in collections. I lately found a very small priodont specimen from Sumatra 

 in Major Parry's collection, which this author had separated as a new species. After- 

 wards I met with small male specimens only in the Leyden Museum, and a great 

 number of both sexes in the collection of Herr van Lansberge under the incorrect name 

 of 0. lowei. Parry. Gestro, who received a specimen from Van Lansberge's collection, 

 had already recognized it as distinct from 0. lowei. I myself was also at first inclined 



