DR. F. LEUTHNER ON THE ODONTOLABINI. 461 
and smaller male is in Major Parry’s collection (fig. 10). A careful examination has 
convinced me that the insect figured by Vollenhoven as the female, is really a female 
of O. lacordairii. But this error is easily explained, as the specimen is imperfectly 
developed, and both species occur in Sumatra. The specimen measures 37 millim. in 
length, and has a comparatively small head, in which the canthus is almost entirely 
undeveloped. The very convex prothorax is also abnormal, and therefore narrower 
than the elytra (compare the measurements under 0. /acordairii). The middle spines 
are curved backwards, and are not so much developed as O. ludekingi(?). The 
prothorax is black, with no trace of orange-yellow marks on the front margin, as in 
the small female from Solok in the Leyden Museum. The elytra are yellow, and the 
oblique mark on the suture, which is 6 millim. broad, runs irregularly to the tip, 
without growing narrower, and terminates on the left elytron in an irregular blotch. 
The front tibie likewise agree with O. lacordairii in form, and the femora are reddish 
brown beneath, as in that species. ‘The spot on the sternal plate, which is characteristic 
of O. lacordairii, occurs in Vollenhoven’s specimen also. 
I describe a specimen as the female of 0. ludekingi (Pl. XCIII. fig. 12) from Herr 
van Lansberge’s collection. It was taken in Sumatra with a series of males, and only 
differs from O. wollastoni (2) in the narrower black mark on the elytra. I cannot 
decide with certainty whether the specimen with the most highly developed mandibles 
really belongs to this species, as Herr van Lansberge thinks, or not, as there is a precisely 
similar specimen from Java in the Leyden Museum. The extraordinary resemblance 
in the pattern of the elytra, and the correspondence of the various mandible-forms, the 
great rarity of the insect, and the great variation in colour in the females of 0. lacor- 
dairti, lead me to consider it very probable that O. ludekingi is a hybrid between the 
two Sumatran species 0. wollastoni and O. lacordairit. 
19. OponTOLABIS LACORDAIRI, Voll. (Plate XCIV. figs. 1-5, 3; figs. 6, 7, 2 .) 
3. Lucanus lacordairei, Voll. Tijdschr. Ent. iv. p. 104, pl. v. fig. 1. 
Male. Head shining black, with a triangular yellow mark on the front and clypeus. 
smooth, except on the sides, where it is very strongly wrinkled ; canthus broad, bilobed, 
emarginate in the middle, the spine behind the eyes sloping forwards, sometimes strongly 
developed (fig. 1), sometimes absent (fig. 4); prothorax broad, uniform black, variable 
in width (figs. 1, 2, 5), strongly emarginate in front, the sides oblique, and widened as 
far as the middle spine, and then strongly emarginate; hind margin waved ; prosternal 
process straight, projecting downwards (fig. 2c); elytra long, oval, sulphur-yellow, 
the base, the suture, and the overlapping rim black ; under-surface black and shining, 
with two large round reddish-brown spots on the mesosternum ; legs black, femora with 
long reddish-brown spots, front tibie long and straight, with one or two spines above 
the terminal fork. 
