440, DR. F. LEUTHNER ON THE ODONTOLABINI. 
smooth ; prosternal and mesosternal processes but slightly developed (fig. 4a); elytra 
olive-brown, finely punctured, and thinly clothed with brown hair; front tibie with 
two spines above the terminal fork. 
Mandibles. 
1 & 3. Forma telodonta and Forma priodonta.—At present unknown. 
2. Forma amphiodonta.—Manaibles longer than the head, three-cornered, upper side 
flattened, distinctly punctured, long and straight, with five teeth at the tip, and two or 
three at the base. 
Female. Quite hairless, very like that of the preceding species, but more slender ; 
prothorax with two, or often three, lateral spines like the male; prosternal process 
flattened ; elytra long and narrow; front tibiee narrow, with three or four spines above 
the terminal fork. 
Number of specimens examined: fifty-four males, and twenty-seven females, in the 
collections of Oxford, Leyden, Amsterdam, Paris, and London (Bates and Parry). 
Habitat. Sirdang (Sumatra) and Sarawak (Borneo). 
Measurements. 
Total length, Head. Mandibles. Prothorax. Elytra. 
millim. millim. millim, millim. millim, 
61 10 by 18 18 11-0 by.24 29 by 20 
: 57 rely, 15 11-0 ,, 22 28 ,, 20 
Ace Ot ed 9 ,, 15 13 105 ,, 20 26 ,, 19:5 
\ 52 S14 12 10-0 ,, 19 25 ,, 19 
Three females, 45 ih ese 6 10:0 ,, 19 26 ,, 195 
I diligently sought for as many specimens as possible, but was unable to meet with 
either the telodont or the priodont form. 
Although 0. gracilis (3) from Nias appears to be very distinct from Bornean 
specimens of 0. dalmani, in which the whole body is hairy, it is impossible to draw a 
sharp line between Bornean and large Sumatran specimens, either in one sex or the 
other. The Leyden Museum possesses an amphiodont male (64 millim. in length), 
without locality, which appears to be intermediate between the two forms. Its upper 
surface is smooth, and very sparsely hairy. ‘The prosternal and mesosternal processes 
are strongly developed; and the under-surface of the prothorax is longitudinally 
striped on the sides as in 0. gracilis. ‘The short rounded mandibles are compressed, 
and much resemble those of 0. siva, but there are three basal teeth (not two), and 
five apical ones; the spine behind the eyes projects slightly forward; and the front 
tibiz have two or three spines above the terminal fork. 
Total length 64 millim., head 11 by 20, prothorax 13 by 25, elytra 32 by 243, 
mandibles 15, 
