W IIKKl.F.H: TIIK ANTS OF HoKNKO. 45 



cpinotiiin (suh^eii. IMiysocri'ina) tlum occur in other regions. I/<'pto- 

 genys is rcjircscntcd hy several lar^e and haiidsoinc sjM'cies of the 

 subgenus Lohopella. and Catauhicus, 1 )oHchoderus (suhgen. Hypo- 

 cHnca), Polyrhaehis. and Kchino])h» arc also rich in species. All lait 

 throe of the suhp'ncra of Polyrhacliis ( Ha^'ioniyrnia. Hcdoniynna, 

 and Mynnutopu) are known to occur in the island. Of (aniponotus 

 the subgenera Myrniotarsus and Colobopsis arc rcprcscntcfl by 

 numerous species, while most of the other subgenera are rather poorly 

 represented, though often by peculiar forms (Myrmoturba, Myrmo- 

 sphincta). Comparetl with the Philippines and the adjacent main- 

 land, and especially with Papua and Australia, Borneo seems to possess 

 few species of Pheidole and Monomorimn, and numy j)rimitive poner- 

 ine genera have not been recordeil from the island, e.g. Mystrium, 

 Stigmatomma, Trapeziopelta, Prodiscothyrea, ('ryi)topone, and 

 Centromyrmex. I believe, however, that some or all of these will 

 be foimd in Borneo. Only recently I received species of Mystrium, 

 Stigmatomma, Trapeziopelta, and Centromyrmex from the Phil- 

 ippines, where they were previously unknown. Of course, Borneo 

 has been invaded by the usual tropicopolitan tramp species, Mono- 

 morium pharaonis and floricola, Tdramorktm guincense and siviilli- 

 mum, Pheidole megaccphaJa, Triglyphothri.r striatidcns, Plagiolcpis 

 longipes, and Prevolepis longicomis, and obscvra. 



Formicidae: Ponerinae. 

 1. Cerapachys antennatus Smith. 



Cerapachys antennatus Smith, Journ. Proc. Linn. soc. London. Zool., 1857, 2, 

 p. 74, ^ ; Emery, Ann. Mas. civ. Geneva, 1887, ser. 2, 5, p. 445, 9, pi. 1, 

 fig. 8, 9; Emery, Gen. Ins. Ponerinae, 1911, p. 9, S 9. 



Type-locality: Sarawak, Borneo (A. R. Wallace). 

 J\'orker. Length 5.5 mm. 



Head distinctly longer than broad, narrower in front than behind, with 

 straight sides, broadly concave occipital border, acute occipital angles and 

 convex dorsal surface, subtruncate behind. Eyes rather large, flattened, 

 their anterior orbits at the middle of the head. There is a small shallow 

 impression on the middle of the vertex. Occipital border marginate, the 

 margination surrounding the corners and continued some distance along the 

 ventral surface of the head. Gula with a pair of small, prominent teeth at 



