THE INDO-AUSTRALIAN SPECIES OF THE ANT 
GENUS STRUMIGENYS FR. SMITH: GROUP OF 
DORIAE EMERYi 
By William L. Brown, Jr. 
Museum of Comparative Zoology, Harvard University 
The Strumigenys doriae group includes three rather lapge 
species of uniform aspect with a scattered distribution in 
the East Indies. The mandibles are greatly simplified, 
evidently through loss of structures, and are like those of 
the Neotropical elongata group in lacking entirely preapical 
teeth or distinct dentiform angles in the preapical position. 
The apical fork teeth are strong and spiniform, straight 
or nearly so; an intercalary denticle may be present or 
absent. Mandibular blades straight, slightly narrowed at 
insertions ; vertex raised and convex ; occipital lobes strong- 
ly depressed; posterior excision deep. Labrum transverse, 
with a narrow, apically truncate extension on each side 
extending laterally beyond the lateral borders of the closed 
mandibles. Legs and antennae long and slender; funicular 
segment iv elongate. Body, including legs with very long, 
fine outstanding hairs. In the two species actually ex- 
amined {S. bryanti and S. idcerosa) , the sculpture of cer- 
tain areas is modified to include coarse pits and larger, 
shallow, margined crateriform areas in bilaterally paired 
positions. These regions are ordinarily plated or encrusted 
with a light-colored granular substance, which, when re- 
moved by soaking, leaves uncovered impressed areas filled 
with short, fine dense pile. The whole apparatus appears 
to be secretory in function, though for what purpose, it is 
still not known. 
These structures, which I refer to as secretory pits and 
lacunae, appear to be special intensive developments of a 
widespread general tendency among strumigenite species 
to produce a granular integumental covering. This cover- 
ing is not an artifact, since it can be seen in living speci- 
^Published with a grant from the Museum of Comparative Zoology at 
Harvard College. 
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