468 DB. r. LEUTHNEE ON THE ODONTOLABINI. 



as in a, but the small teeth which follow the central tooth are divided into two groups. 

 The prothorax of the specimen figured is much narrower (fig. 7). 



3. Forma amphiodonta {irregularis).- — The right mandible is always more strongly 

 developed, the five or six small teeth at the tip are divided by a gap from the two 

 obtuse basal teeth (fig. 9). 



4. Forma priodonta. — Unknown. 



Variations in Colour. 

 The colour of the upper side of the elytra is not constant. There are males of all 

 forms in which the black mark is pointed towards the base (figs. 5, 6, 9). In others 

 this mark is broad almost to the tip in all forms, and then suddenly disappears, as in 

 fig. 7, and in the type figured by Parry. As both forms occur together, both in Malacca 

 and Sumatra, they cannot be regarded as constant local races, as in 0. vollenhoveni, and 

 I was obliged to treat them as belonging to the same species. The four forms of man- 

 dibles described evidently also belong to the same species. 



Female. Uniform black, except the bicolorous elytra. Head slightly convex, smooth, 

 only slightly punctured on the front margin ; canthus strongly developed, as broad as 

 the eye ; prothorax strongly convex, the front edge strongly emarginate, the sides 

 strongly S-shaped as far as the central spine, and deeply emarginate behind ; hinder 

 margin as broad as the shoulders, and waved ; elytra orange-yellow, shining, with a 

 black triangular mark beginning just inside the shoulders, gradually narrowing and 

 ceasing abruptly about 4 or 5 millimetres from the tip ; rim of the elytra black beneath ; 

 front tibiae straight, slightly incurved, with three or four spines above the well-developed 

 terminal fork. 



Number of specimens examined : eleven males and eight females, in the collections 

 of the British Museum, Leyden, Amsterdam (from Lahat, Sumatra), and of Messrs. 

 Parry and van Lansberge. 



Habitat. Malacca, Sumatra. 



Measurements. 



Total length. Head. Mandibles. Prothorax. Elytra, 



millim. milliin. millim. millim. miUim. 



1. Parry's type (Malacca), e 67 14-0 by 20 22 9-0 by 19 25 by 20 



2. Parry's coU. (Malacca) 54 10-5 „ 17 12-5 8-5 „ 18 24 „ 19 



3. Sumatra (telodont) 68 14-0 „ 23-5 24 10-0 „ 21 27 „ 22 



4. Sumatra (pectinata) 70 14-0 „ 22 22 10-0 „ 22 27 „ 22 



5. Sumatra (pectinata) 70 15-0 „ 24 23 10-0 „ 23-5 28 „ 23 



6. Sumatra (amphiodonta irregularis) . 62 12-0 „ 18 13 9-0 „ 20 25 „ 20 



Parry's type (Malacca) 38 7-0 „ 13 6-5 8-0 „ 17 21 „ 18 



Parry's type (Sumatra), $ 41 7-0 „ 13 6-5 9-0 „ 18 22 „ 18 



This species is very rare in collections, and it was only with great difliculty that I 



