464 DR. F. LEUTHNER ON THE ODONTOLABINI., 
a narrow black suture, and a narrow black border at the base of the shoulders; front 
tibie 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. Resembles that of O. 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; front tibie long and narrow, with well- 
developed terminal fork, and four or five spines on the outer side; the hind tibie 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. (Nepal?), Siam, Malacca, Sumatra, Borneo. 
Measurements. 
Total length. Head. Mandibles. Prothorax. Elytra. 
millim, millim. millim. millim, millim. 
Lansb. coll. (mesodont, fig.10,b).. 62 11 by 21 15 10:0 by 26 28 by 23 
Lansb. coll. (amphiodont) ...... 68 14 ,, 24 15 12:0 ,, 26 29 ,, 24 
Brit. ALS coll. (priodonta rage 56 12 ,, 19 14 11-0 ,, 28 26 ,, 29°5 
aS) opps) eyarelaveics. exciexel/esa cacstare 
Parry’s coll. (Borneo, Wallace).... 42 8 ,, 14 6 10:0 ,, 21 24 ,, 21 
Lansb. coll. (Malacca) .......... 44 9 ,, 15:5 i 105 ,, 21 25 5, 21 
Lansb. coll. (Sumatra)? ........ 41 9 ,, 14 65 10:0 ,, 19°5 24 ,, 20 
Parry’s coll. (Borneo, Wallace) 9? .. 36 Gayle 4:5 8:0 ,, 16°5 20 ,, 17 
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 isa gap between the teeth in larger specimens, which is wanting in small 
ones. The crippled and irregular form, which resembles the amphiodont form of 
O. wollastoni (Pl. XCIII. fig. 9) and O. 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 J have seen is in Herr van Lansberge’s collection (fig. 106). 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 ; 
