1922] 
The Mating of Diacamma 
203 
THE MATING OF DIACAMMA 1 
By W. M. Wheeler and J. W. Chapman. 
Diacamma is a very clearly defined genus of Ponerine ants 
confined to India, Ceyldn, Southern China, the Malay Archi- 
pelago, New Guinea and the northeast corner of Australia. 
The species were carefully monographed by Emery in 1897, 
and a list of those known in 1911 was published by the same 
author in the “Genera Insectorum”. There are only thirteen 
species, but one of them, the Indomalayan rugosum has some 25 
subspecies and varieties. All the species have large black or 
bronzy, more rarely beautifully metallic blue or green, workers 
(Fig. 1), and pale yellow or yellowish red males (Fig. 2), with very 
long antennse and the pygiclium terminating in a curved spine. 
Fig. 1. Worker of Diacamma australe, dorsal and lateral view and black cocoon of same x4. 
lContribution from the Entomological Laboratory of the Bussey Institution, Harvard 
University, No. 212. 
