478 DR. F. LEUTHNER ON THE ODONTOLABINI. 
stripes on each side, as in the male, shoulder-angles acute; front tibiz long and narrow 
(like the male), with the terminal fork well developed, and three or four spines above 
it on the outer side. 
Habitat. Malacca and Borneo. 
Measurements. 
Total length. Head. Mandibles.  Prothorax. Elytra. 
millim. millim. millim. millim. millim. 
6. Normal (Borneo) ........ 43 5:0 by 12 14 9 by 15 17°5 by 13 
Var. cephalotes (Borneo) .. 37 65 .,, 9 13 i 35 Leo 14-0 ,, 115 
Q. (Malacca) ...........00- 24 40, 7 3-2 6 ,, 10°5 13-0 ,, 105 
(Bowes) eee eel 28°5 50 ,, 8 4:5 {fer by 16:0 ,, 12 
This is so different from other species of Odontolabis that I have been obliged, like 
Major Parry, to treat it as a separate section. It is distinguished by the striation of 
the elytra in both sexes, the broad front tibie of the male (resembling those of the 
Chinese O. platynotus), and the pointed canthus. 
Very few specimens of this species are known (only three of each sex), and I examined 
the types in Herr van Lansberge’s collection. 
There is a male from Borneo in Parry’s collection (smaller than the others) in which 
the head is very long, and the mandibles are strongly curved downwards, giving the 
insect a totally different appearance. Prof. Westwood and Mr. C. O. Waterhouse are 
inclined to consider it a new species; but I have too few specimens to decide. How- 
ever, I cannot consider the elongation of the head extraordinary in a telodont form. 
The frontal crest is not raised here, but projects forwards (compare the enormously 
developed frontal crest in Homoderus mellyi, Deyrolle, Ann. Sci. Ent. France (4) iv. 
p. 313, pl. iv. fig. 2; an extraordinary figure). 
The long deflexed mandibles are even more interesting and instructive than the 
head; they agree in structure with the smaller specimens of typical 0. striatus, but 
instead of being flattened and horizontal, their hinder half is curved downwards at an 
angle of 90°. The teeth at the base and tip are unaltered. 
These curved mandibles are remarkably like those of Chiasognathus, and plainly 
indicate how these may have originated. Whether this form is distinct from 0. striatus, 
or is only a monstrosity, the modification of the mandibles must always be regarded as 
a remarkable instance of their plasticity, and of the correlation of the structure of the 
head with that of the mandibles. I propose to call this form var. cephalotes. 
Other modifications of the male mandibles are at present unknown. 
