THE INDO-AUSTRALIAN SPECIES OF THE 
ANT GENUS STRUMIGENYS FR. SMITH: 
S. DECOLLATA MANN AND S. ECLIPTACOCA 
NEW SPECIES 1 
By William L. Brown, Jr. 
Museum of Comparative Zoology, Harvard University 
This paper is a further contribution in a series which, 
when complete, will cover the Indo-Australian portion of 
the world fauna of the dacetine ant genus Strumigenys Fr. 
Smith. Previous parts, the first two of which include ex- 
planations of the abbreviations used for citing measure- 
ments and indices, are in Psyche 60: 85-89 (1953), 60: 
160-166 (1954), 61: 68-73 (1954) and 63: 113-118 (1957). 
The purpose of this part is to furnish supplementary de- 
scriptive material on S. decollata, known only from the type 
material from the Solomon Islands, and to formally describe 
a new species, S. ecliptacoca, from wet mountain forest in 
Dutch New Guinea. These two species are peripheral mem- 
bers of the godeffroyi group, both aberrant in a number of 
respects. They have in common processes situated near the 
midlength of the inner mandibular borders — in decollata 
an acute denticle, in ecliptacoca a low welt or ridge — which 
are quite different from anything seen in other Indo-Aus- 
tralian Strumigenys species. Whether these two species are 
related to each other at all closely is problematical, but it 
is convenient to consider them together here. Figures of 
both species have been prepared, but are being saved for 
use in collective plates in connection with the eventual keys 
to all the Indo-Australian species of the genus. 
Strumigenys decollata Mann 
Strumigenys decollata Mann, 1919, Bull. Mus. Comp. Zool., 
Published with the aid of a grant from the Museum of Comparative 
Zoology at Harvard College. 
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