464 



DE. F. LEUTHNER ON THE ODONTOLABINI. 



a narrow black suture, and a narrow black border at the base of the shoulders ; front 

 tibiae very long, and incurved and channelled on the upper side ; terminal fork slightly 

 developed, and with three or four very slightly developed spines above it. 



Female. Eesembles that of 0. wollastoni. Uniform black, except the bicolorous 

 elytra. Head strongly convex, and coarsely punctured ; canthus broad ; mandibles 

 strongly punctured, with three irregular teeth on the inside ; mentum with a semi- 

 circular excavation, and coarsely punctured. Prothorax broad, the sides running 

 straight and oblique to the middle spine, the latter hardly pointed. Elytra more 

 convex, and broader than in the male, half black and half yellow ; the black mark 

 begins at the shoulder, runs straight nearly to the tip, and then suddenly ceases. The 

 black colour frequently extends to the tip, where it unites with the borders. Under- 

 surface of the overlapping rim always black ; fi'ont tibise long and narrow, with weU- 

 developed terminal fork, and four or five spines on the outer side ; the hind tibise are 

 slightly incurved, and longitudinally furrowed. 



Number of specimens examined : eighty-eight males and twenty-five females in 

 various museums. The males vary in size from 45 to 68 millim., and the females 

 from 36 to 44 millim. 



Habitat. (Nepali), Siam, Malacca, Sumatra, Borneo. 



Total length, 

 millim. 

 Lansb. coll. (meaodont, fig. 10, 6). . 62 



Lansb. coll. (amphiodont) 68 



Brit. Mus. coU. (priodonta irregu- I 



laris) J 



Parry's coU. (Borneo, Wallace) ... 42 



Lansb. coll. (Malacca) 44 



Lansb. coll. (Sumatra) J 41 



Parry's coll. (Borneo, Wallace) 2 . . 36 



The males and females vary in size, as well as in the form of the prothorax. The 

 specimens from Sumatra and Borneo differ a little, although they indubitably belong to 

 the same species. The mandibles of the males are always irregularly amphio-priodont, 

 and there is a gap between the teeth in larger specimens, which is wanting in small 

 ones. The crippled and irregular form, which resembles the amphiodont form of 

 0. wollastoni (PI. XCIII. fig. 9) and 0. ludekingi (fig. 11), led me to suspect that a 

 higher development of the mandibles might occur. But it is extremely rare, and the 

 only specimen which I have seen is in Herr van Lansberge's collection (fig. 10 5). In 

 this specimen the mandibles are longer than the head, rounded, slender, and regularly 

 curved ; the two sides are nearly symmetrical ; the upper surface finely punctured ; 



