462 DE. F. LEUTHNEE ON THE ODONTOLABINI. 



Mandihles. 



1. Forma teJodonfa. — Mandibles longer than the head, rounded, moderately curved, 

 with four or five small teeth at the tip, behind which is a simple tooth projecting 

 downwards ; a rudimentary tooth on the upper side at the base ; head with strongly 

 developed frontal crest (figs. 1, 2). 



2. Forma mesoclonta. — Mandibles as long as the head, and strongly curved, rounded, 

 with five apical teeth ; a strong centra] tooth curving downwards (with tendency to 

 bifurcation) ; base with a rudimentary obtuse tooth (fig. 3) on the upper side near the 

 basis. 



3. Forma ampMo-mesodooita. — Mandibles as long as the head, broad, sickle-shaped, 

 the apical series of teeth not separated from the central teeth ; base with two obtuse 

 teeth (fig. 4). 



4. Forma priodonta [irregularis). — Mandibles very short, with irregular teeth; head 

 with no spine behind the eye ; prothoi-ax resembling that of female (fig. 5), and spotted 

 with yellow on each side, at the front angles, as in the female (fig. 6). 



Female. Very like that of 0. wollastoni and 0. ludeJcingi in the shape of the head 

 and thorax, but flatter, shining black, with a round orange-red spot on the front angle 

 of the prothorax, both above and below ; elytra long, oval, pale straw-coloured, with a 

 broad black sutural stripe rapidly narrowing before the tip ; borders and the overlapping 

 rim black ; under-surface of the abdomen black, with a large pale brown spot on each 

 side of the mesosternum ; legs black, the underside of the femora with a pale brown 

 spot (fig. 6 a, b). 



Female (variety). There is a small specimen in the Leyden Museum in which the 

 yellow spots on the prothorax are wanting, and the black suture is as narrow as in the 

 male (fig. 7). 



Number of specimens examined : ten males and four females in the Leyden Museum 

 and in Herr van Lansberge's collection. 



Habitat. Eastern Sumatra. 



VoUenhoven described this species from a single male from Sumatra (type in the Leyden 

 Museum), and gave a recognizable figure, which, however, is less accurate than it looks. 

 The head is broadest in front ; but VoUenhoven has represented it as broadest behind. 



