1910] Wheeler —Aphomomyrmex from Borneo 131 
A NEW SPECIES OF APHOMOMYRMEX FROM BORNEO." 
By Wirtu1am Morton WHEELER. 
Among the Camponotine ants of the Old World tropics there are 
two remarkable genera, dphomomyrmez and Dimorphomyrmez, con- 
cerning which comparatively little is known. dphomomyrmex was 
based by Emery” on A. afer from Kamerun, represented by male, 
female and worker specimens. He was in some doubt as to whether 
the worker, which had nine-jointed antenne, was cospecific with the 
female and male, in both of which the antenne were ten-jointed. 
He regarded the genus as allied to the neotropical Myrmelachista 
Roger, which comprises a number of species, with nine- to ten- 
jointed antenne, and to Dimorphomyrmea Ern. André, which is 
represented by D. janeti described by Ern. André from Borneo* and 
D. theryi subsequently discovered by Emery in the Baltic amber.* 
Myrmelachista differs from Aphomomyrmew in having a differ- 
entiated antennal club in the worker and female, better developed 
frontal carine and more laterally placed eyes, while Dimorphomyr- 
mex is peculiar in possessing large, reniform eyes in the worker and 
presumably also in the female, which is still unknown. D. janeti, 
according to André, has dimorphic workers, a large form (soldier) 
measuring 6 mm., with ocelli and a large, oblong head, and a small 
form (worker proper), measuring only 3.5 mm., without ocelli and 
with a proportionately shorter head. Emery says that he has seen 
a worker of this species from Sumatra measuring 4.5 mm. and 
therefore intermediate in size between the soldier and worker of 
Janet. This observation seems to indicate, as Emery has asserted, 
that the worker is really polymorphic in D. janeti. Through the 
kindness of Prof. R. Klebs and Prof. A. Tournquist I have been able 

1 Contributions from the Entomological Laboratory of the Bussey Institution, 
Harvard University. No. 25. 
*Fourmis d'Afrique, Ann. Soc. Ent. Belg. XLIII, 1899, pp. 493-496. 
8 Vovage de M. Chaper a Borneo. Catalogue des Fourmis et Description des 
Espéces Nouvelles. Mém. Soc. Zoél. France, V, 1892, pp. 49-51. 
* Deux Fourmis de l’ambre de la Baltique. Bull. Soc. Ent. France, 1905, No. 
13, pp. 188-189. 
