44 bulletin: museum of comparative zoology. 



low and where Wallace made the celebrated collection of moths to 

 which he refers in "The Malayan Archipelago." 



" Rambungan River is a small stream entering the sea about ten miles 

 south of the Sarawak River. The specimens were taken about twelve 

 miles from the coast. 



" Sadcnig is the town on the Sadong River where the first coal mine 

 was started. 



" Matang Mountain is the beautiful mountain which one sees from 

 Kuching." 



The total number of species of which I have been able to make a 

 record from Borneo is 256. I may have overlooked a few, owing to the 

 widely scattered publication of the original descriptions and citations 

 of localities. On the whole, the fauna has many forms in common with 

 Sumatra, Java, and the Malay Peninsula, and additional exploration 

 will no doubt greatly increase the number of such species. Quite a 

 number of forms, however, seem to be peculiarly Bornean. The 

 total number of genera is 59, distributed among the five subfamilies 

 as follows: Ponerinae 18, Dorylinae 2, Myrmicinae 23, Dolichoderinae 

 4, Camponotinae 12. The following pages add some 58 species 

 (indicated by an asterisk) to the known fauna, including 23 new to 

 science. 



The series of Bornean ant genera comprises several of ancient aspect, 

 e.g., Cerapachys, Phyracaces, Metapone, Acanthomyrmex, Calyp- 

 tomyrmex, Rhopalothrix, Cataulacus, Myrmoteras, Aphomomyrmex, 

 Oecophylla, Gesomyrmex, Dimorphomyrmex, and Echinopla. Some 

 of these seem to be confined to the mountains of Borneo and to be 

 represented also in the mountains of Burmah and the Philippines. 

 One species, Gesomyrmex chaperi, is unusually interesting, as it is 

 peculiar to Borneo. The genus was first described by Mayr in 1868 

 from the Baltic Amber, and many years elapsed before the living 

 Bornean species was discovered by Ernest Andre (1892). In the 

 same paper Andre described a species of Dimorphomyrmex from 

 Borneo and three years later Emery recorded a fossil species from the 

 Baltic Amber. Recently I described a second living species from the 

 mountains of Luzon. It is probable, therefore, that careful explora- 

 tion of the mountains of Borneo and the neighboring islands will 

 bring to light other interesting relicts of the once very widely dis- 

 tributed Eocene ant-fauna. 



Some of the Bornean ant-genera are very rich in species, e.g., 

 Crematogaster, which is remarkable also in comprising more numer- 

 ous forms with 10-jointed antennae (subgen.' Decacrema) and swollen 



