DE. F. LEUTHNEB, ON THE ODONTOLABINI. 



417 



Map III. — Map of the Indo-Malayan Region, showing the Distribution of the Species 

 alhed to Odontolahis castelnaudi. 





(Teas! clnalum C ^^ - ^ 



%] ' '"^--^ 



1. 0. castelnaudi, Parry. 



2. 0. sommeri, Parry. 



3. 0. brookeanus, Vollh. 



4. 0. lowii, Parry. 



5. + 0. latipennis, ^qpc. 



6. 0. fratellus, Leuthn. 



7. 0. ajratus, ffojje. 



8. 0. carinatus, Linn. 



the head is nearly the same as in 0. castelnaudi and 0. brookeanus, and the shape of 

 the mandibles is very similar. The broad prothorax is very similar, and the front tibia; 

 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 0. inaqualis how easily this change of colour may have 

 arisen. The variations of the prothorax which occur in the Bornean 0. castelnaudi 

 (PI. XCV. fig. 3) reappear in 0. latipennis, in the small Banka race of which the pro- 

 thorax is much narrowed in front (PI. XCVI. fig. 3) ; and this is still more remarkable 

 in 0. fratellus from Manilla (PI. 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 0. 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 XI. No. 5.— November, 1885. 3 q 



