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is, arranged according to their Morphological, Genetic, and Geographical Relationships. 
oO MANDIBLES POLYMORPHIC. 
A. do MENTUM HAIRLEss, 
Q bicolorous, 
SS 
IIT. burmeisteri group. 
11. O. sinensis, Westw. (China.) 
12. O. cuwvera, Hope. (N. India.) 
II. stevensi group. 
9. O. stevensi, Thoms. (Celebes.) | 13.0. mouhoti, Parry. (S. Siam.) 
14. O. delesserti, Guér. (S. India.) 
10. O. duivenbodii, Deyr. (Sangir.) 
15. O. burmeisteri, Hope. (Travancore.) 
| 
IV. wollastoni group. 
a. 3 mandibles uniform (retrograde ?). 
16, O. wollastoni, Parry. (Malacca, Sumatra,)—\ = — ees —, 
17, O.vollenhoveni, Parry. (Borneo. )}-— 
(bicolor, Oliv.) { Sumatra. 
20. O. gazella, Fabr. (Sumats ) 
Borneo. - 
18. 0. ludekingi, Voll. (Sumatra.)———____ | 
21. O. inequalis, Kp. (Nias.) 
19. 0. lacordatrii, Voll. (Sumatra,)————__ J 
V . castelnaudi group. 
a 
} 22. O. castelnaudi, Parry. (Malacca, Sumatra, Borneo.) 
23. O. sommeri, Parry. (Sumatra, Banka.) 
b. 
Westw. ') 24. 0. brookeanus, Voll. (Borneo.) 
(Ma jlacea.) 25. 0. lowii, Parry. (Borneo.) 
¢.) Incerte sedis. 
‘- O. striatus, Deyr. (Malacca, Borneo.) 
3 var. cephalotes. (Borneo.) 
