448 DR. F. LEUTHNER ON THE ODONTOLABINI. 
Male. Uniform black, with a satiny lustre, very finely punctured. Head broad, 
flattened, front edge straight, or very slightly emarginate, canthus before the eyes 
broad, but very narrow round them; spine behind the eyes rounded or pointed, head 
much narrowed behind; prothorax short, broader than the head, strongly emarginate 
on each side in front, the sides straight and oblique as far as the middle spine, which is 
rounded off; hind margin strongly waved; prosternal process strongly developed, 
straight, and inclining downwards; elytra narrower than the prothorax, moderately 
convex ; front tibie long and straight, with two or three slender spines on the outer 
side above the slender apical fork. 
Mandibles. 
1. Forma telodonta.—Mandibles as long as the head and prothorax together, very long 
and slender, forked at the tip, with three small teeth on the front branch and a long 
simple hinder one. Front margin of the head straight and slightly swollen; epistoma 
broad, triangular. Head rather convex, with large coarse pits on the sides behind 
the eyes. Rim of the prothorax beneath conspicuously wrinkled (fig. 1). Two 
specimens. 
2. Forma mesodonta.—Mandibles as long as the head, and strongly curved, with four 
or five teeth at the tip, followed by a middle tooth projecting downwards, which is 
obtusely conical, and a similar one near the base. Head more flattened, front margin 
not swollen, but somewhat emarginate, and without the pits behind the eyes. Rim of 
the thorax beneath slightly or not at all sculptured (var. didentata, fig. 2). ‘Two 
specimens. 
3. Forma amphiodonta.—Mandibles broader, flattened, with five teeth at the tip, and 
an obtuse one at the base. One specimen. 
4, Forma priodonta (fig. 3).—Mandibles shorter than the head, rather flattened, with 
six or seven crowded teeth, without gaps. Front edge strongly emarginate, with 
triangular epistoma above the closed mandibles. ‘Three specimens. 
Female. Resembles the females of 0. gazella and O. latipennis ; uniform black, except 
the elytra. Head flattened, coarsely granulated in front only; canthus broad; pro- 
thorax flattened, very broad, sides somewhat curved as far as the middle spine, and not 
indented beyond; elytra broad, oval, flattened, bicolorous, straw-coloured, with a broad 
black mark beginning at the shoulders and not narrowing much towards the tip, where 
it unites with the narrow black margin; rim of the elytra black beneath; front tibie 
broad, slightly curved inwards, and with four or five spines on the outer side above the 
slightly developed terminal fork; four hind tibiz straight, and less strongly incurved 
than in O. gazella. 
Number of specimens examined: eleven males and three females, in the collections 
of Messrs. Parry and van Lansberge and of the Jardin des Plantes &c. 
Habitat. Celebes (Menado), collected by Mr. A. R. Wallace. 
