468 DR. F. LEUTHNER ON THE ODONTOLABINI. 
Mandibles. 
1. Forma telodonta.—At present unknown. 
2. Forma mesodonta (fig. 6).—Corresponds to form a of O. 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 O. brookeanus. 
3. Forma amphiodonta (fig. 7).—Similar to the same form of O. castelnaudi (fig. 4) 
and 0. brookeanus (fig. 14). Flattened, finely punctured. Mandibles with four or five 
apical teeth, and two basal ones. 
4. Forma priodonta.—Flattened, with five or six irregular teeth on the inside (fig. 8). 
Female. Very like that of O. 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 O. 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 O. 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. 
Total length. Head. Mandibles. Prothorax. Elytra. 
millim. millim. millim. millim. millim. 
Mesodont.... 50 10 by 16 12 9:0 by 19 21 by 19 
Amphiodont.. 50 TEE 5 ales} 115 9-5 ,, 21 23 ,, 20 
¢d. Sumatra.. 41 
Priodont .... 50 els 10:0 10:0 ,, 20 22 ,, 19 
38 Of gy, lil 75 75 ,, 16 19 ,, 16 
Q. Sumatra... cvsecneosee/-% 27 Feo 40 7, 18 16 ,, 14 
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 
