472 DE. r. LEUTHNER ON THE ODONTOLABINI. 



Mandibles. 

 All the males of this species which I have seen were priodont, except a single 

 specimen in Herr van Lansberge's collection, which has a small gap between the teeth 

 on each side, and thus becomes an amphiodont form, with six apical teeth and two 

 united obtuse basal teeth. The spine behind the eyes is much broader, and horizontal 

 as in 0. castelnaudi. 



Female. Uniform pitchy black. Head slightly convex, resembling 0. castelnaudi ( 2 ) ; 

 clypeus straight ; canthus moderately developed, narrower than the eye ; prothorax very 

 like that of 0. castelnaudi (?) in form, narrower in front, but as broad as the elytra, 

 flatter, front edge deeply emarginate on the sides ; sides slightly curved as far as the 

 central angle, which is not pointed, behind this very slightly emarginate ; hind margin 

 slightly waved. Elytra broadly oval, very convex, dark nut-brown, shining, very finely 

 punctured with a broad black sufl'used central band, ceasing before the tip, resembling 

 0. gazella { 2 ). Mandibles with three or four teeth on the inside. Under-surface 

 pitchy black. Mentum with coarse granular punctuation, the sides raised. Prosternal 

 process flattened. Front tibiae slightly curved, with five or six spines above the terminal 

 fork ; hind tibise somewhat curved, as in 0. gazella. 



Number of specimens examined : twenty-two males and nine females, in all the 

 principal collections. 



Habitat. Malacca, Prince of Wales's Island, Sumatra, Banka, Borneo. 



The male and female from Banka in Herr van Lansberge's collection are smaller 

 than the others (figs. 3 & 4). Male 50-45 millim., female 36 millim. ; but there were 

 too few specimens to enable me to ascertain whether this difiierence in size is constant 

 in specimens from that locality. 



27. Odontolabis fratellus, sp. n. (Plate XCVI. fig. 5, d ; fig. 6, 2 , inexact.) 



Male very like 0. latipennis, but smaller. Female much more unlike than the male. 



Male. Mandibles, head, and prothorax flattened, finely punctured, dull, elytra 

 shining. Head as in 0. latipennis, but broader behind. Prothorax differing from 

 small specimens of the latter ; the sides not so prominent, with the front angles acute, 

 then convex to the central spine, then sloping obliquely backwards to the waved hind 



