DE. 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 0. 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. lacordairii). The middle spines 

 are curved backwards, and are not so much developed as 0. ludeMngi ( ? ). 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 tibiae likewise agree with 0. lacordairii in form, and the femora are reddish 

 brown beneath, as in that species. The spot on the sternal plate, which is characteristic 

 of 0. lacordairii, occurs in Vollenhoven's specimen also. 



I describe a specimen as the female of 0. ludekingi (PI. XCIII. fig. 12) from Herr 

 van Lansberge's collection. It was taken in Sumatra with a series of males, and only 

 differs from 0. wollastoni (?) 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- 

 dairii, lead me to consider it very probable that 0. ludekingi is a hybrid between the 

 two Sumatran species 0. wollastoni and 0. lacordairii. 



19. Odontolabis lacoedaieii, Voll. (Plate XCIV. figs. 1-5, 6 ; figs. 6, 7, S .) 

 g . Lucanus lacordairei, Voll. Tijdschr. Ent. iv. p. 104, pi. 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. 2 c) ; 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 tibiae long and straight, with one or two spines above 

 the terminal fork. 



