466 DR. F. LEUTHNEE ON THE ODONTOLABINI. 



Section V. 



22, Odontolabis castelnaudi, Parry. (Plate XCV. iigs. 1-4, d ; fig. 5, 2 .) 



(J. Odontolabis castelnaudi, Parry, Trans. Ent. Soc. Loud. (3) ii. p. 14, pi. i. fig. 2; 1. c. (1870) 

 p. 74, pi. iii. figs. 4, 5, 6. 



Male. UDiform black, the elytra excepted. Head flattened, finely punctured, front 

 margin slightly arclied ; canthus very narrow, spine behind the eyes very prominent, 

 rounded, obtuse, sloping obliquely towards the neck. Prothorax with the front edge 

 emarginate on each side, the sides straight, rounded off beyond the middle, in the 

 position of the central spine, and then somewhat emarginate. Under-surface smooth, 

 dull. Prosternal process projecting strongly forwards. Elytra uniform orange-yellow, 

 except a narrow black border at the base, and a line on the suture ; the outer margin is 

 also very narrowly edged with black. Front tibiae long, slender, and slightly incurved, 

 the terminal fork well developed, and one or two very small spines above it. A shallow 

 channel runs along the whole of the upper side. 



Mandibles. 



1. Forma telodonta. — Mandibles as long as the head and prothorax together, slender, 

 the tip simple, below which is a strong projection slightly bifurcate at the tip, below 

 which are four or five small irregular teeth on the inside. A small tooth projects 

 forward on the inside near the base. Head with the front margin somewhat swollen ; 

 a broad epistoma is present, which is straight in front, and clothed with i-ed hair 



(fig- !)• 



2. Forma mesodonta. — a, ynx-pectinata. Mandibles as long as the head, much thicker 



than in no. 1, with four or five very small irregular teeth at the tip, followed on the 

 inside by four small obtuse teeth, and a strongly developed central tooth curving down- 

 wards ; base with an obtuse tooth (fig. 2). h, var. mesodonta (s. str.). Mandibles as long 

 as the head, strongly curved, with five small apical teeth, and a rounded tooth curving 

 downwards in the middle ; base with an obtuse tooth ; head with the front margin 

 emarginate (fig. 3). 



3. Forma amphiodonta. — Mandibles much shorter than the head, strongly curved, 

 flattened, with five apical teeth, separated by a gap from the two obtuse basal teeth. 

 Head without frontal crest or epistoma (fig. 4). 



4. Forma priodonta. — Unknown. 



Female. Black, except the yellow elytra. Head long, slightly convex, strongly and 

 coarsely punctured ; canthus round, as broad as the eye ; mentum strongly shagreened, 

 and semicircularly excavated ; mandibles comparatively small. Prothorax much arched, 

 the sides convex, with no central spine, and but slightly emarginate behind. Elytra 

 long, oval, orange-yellow, narrowly black at the base, and with a narrow black stripe 

 on the suture ; rim of the elytra black beneath (fig. 5). 



