DR. F. LEUTHNER ON THE ODONTOLABINI, 417 
Map III.—Map of the Indo-Malayan Region, showing the Distribution of the Species 
allied to Odontolabis castelnaudi. 
1. O. castelnaudi, Parry. 5. + O. latipennis, Hope, 
2 0. 
2. O. sommeri, Parry. 6. fratellus, Leuthn. 
3. O. brookeanus, Vollh, 
4 
. O. lowii, Parry. 
7. O. eratus, Hope. 
8. O. carinatus, Linn. 
the head is nearly the same as in 0. castelnaudi and O. brookeanus, and the shape of 
the mandibles is very similar. The broad prothorax is very similar, and the front tibie 
are long and strongly curved. The whole body, including the elytra, is apparently 
dark brown; but, on a closer examination, the suture proves to be deep black, while 
the elytra are otherwise deep chestnut-brown, In the female, however, the black 
shoulder-spots make the two colours of the elytra easily perceptible. We can readily 
perceive from 0. gazella and O. inequalis how easily this change of colour may have 
arisen. ‘The variations of the prothorax which occur in the Bornean 0. castelnaudi 
(Pl. XCV. fig. 3) reappear in 0. latipennis, in the small Banka race of which the pro- 
thorax is much narrowed in front (Pl. XCVI. fig. 8); and this is still more remarkable 
in O. fratellus from Manilla (Pl. XCVI. figs. 5, 6). In the latter species the colour is 
almost uniform deep black in both sexes. The geographical distribution (compare Map 
III.) agrees with their probable origin. It is perfectly parallel to that of O. gazella. 
The gap between Sections A and B appears at first to be insurmountable; and it 
appeared so considerable to the descriptive morphologists that they separated Section A 
as a separate subgenus under the name of Calcodes. 
VOL, XI.—Part x1. No. 5.— November, 1885. 3Q 
