wheeler: the ants of Borneo. 129 



Described from two workers and a female taken by Mr. John 

 Hewitt at Kuching. 



Of the various species of Myrmothrinax, namely thrinax Roger, 

 textor Smith, aequicuspis Wheeler, dahli Forel and frauenfeldi Mayr, this 

 species seems to be most closely related to the last. The worker 

 triacna, however, is smaller, not black and has the sides of the thorax 

 sharply marginate, whereas Mayr says of frauenfeldi that it has the 

 " thorax sine marginibus aciitis." The Bornean form is not unlike 

 dahli in the general shape of the thorax, but the pronotal teeth of the 

 former are longer, the epinotal teeth much shorter, the sculpture, 

 color, and size are different and the basal funicular joints are shorter. 

 P. friaena occurs also in Java as I possess a dealated female from that 

 island received from Staudinger under the name frauenfeldi. 



211. PoLYRHACHis (Chariomyrma) arcuata (Le Guillou). 



Formica arcuata Le Guillou, Ann. Soc. ent. France, 1841, 10, p. 315, ^ 9 . 

 Polyrhachis latifrons Roger, Berlin ent. zeitschr. 1863, 7, p. 155, ^ . 

 Polyrhachis modiglianii Emery, Ann. Mus. civ. Geneva, 1888, ser. 2, 5, p. 529, 



y 9, pi. 9, fig. 1. 

 Polyrhachis arcuata Forel, Mitth. Zool. mus. Berlin, 1901, 2, p. 32. 



Type-locality: Borneo (Voyage of the "x\strolabe" and "Zelee"). 

 A single dealated female from Bongo Mt., Sarawak (Hewitt and 

 Brooks). 



212. Polyrhachis (Myrmhopla) armata (Le Guillou). 



Formica armata Le Guillou, Ann. Soc. ent. France, 1841, 10, p. 313, cf. 



Polyrhachis armata Mayr, Tijdschr. ent., 1867, 10, p. 46, ^ . 



Polyrhachis defensus Smith, Journ. Proc. Linn. soc. London. Zool., 1857, 2, 



p. 59, y . 



Polyrhachis pandarus Smith, ibid, p. 62, ^ . 



Tyj)c-locality: Samboangan, Philippines (Voyage of the "Astro- 

 labe" and "Zelee"). 



Sarawak (Doria and Beccari; A. R. Wallace); Hayvep (Winkler). 



Numerous workers and females from Kuching (John Hewitt) and 

 Kuching, Matang, and Serambu Mts. (H. W. Smith) and British 

 North Borneo (E. B. Kershaw). Nearly all of these specimens have 

 the gaster ferruginous instead of black. 



