THE INDO-AUSTRALIAN SPECIES OF THE ANT 
GENUS STRUMIGENYS FR. SMITH: S. CHAPMANl 
NEW SPECIES^ 
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 world fauna of the dacetine 
ant genus Strumigenys Fr. Smith. Previous parts, the first 
three of which include explanations of the abbreviations 
used for citing measurements and indices, are in Psyche 
60: 1-5; 60: 85-89 (1953), and 60: 160-166 (1954) ; Jour. 
N.Y. Ent. Soc. 61: 53-59; 61: 101-110 (1953) ; 61: 189-200 
(1954), and in press. 
Strumigenys chapmani, new species 
(Text-fig. 1) 
Holotype worker: TL 2.8, HL 0.76, ML 0.24 (Full ex- 
posed L mandibles 0.27 mm., cited because the mandibles 
tilt dorsad from the general plane of the cephalic dorsum 
at an angle approaching 30°, so that they appear fore- 
shortened in the view at which HL is measured in the 
standard way. In fig. 1, the head is shown as slightly tilted 
forward, so that the head is a bit shorter and the mandibles 
a bit longer than as seen at standard HL position.) Head 
width across occipital lobes 0.68 mm. WL 0.70, exposed 
scape L 0.30-0.31, funiculus L 0.46 mm., greatest perpen- 
dicular depth of head (near posterior quarter of length) 
about 0.30 mm. ; index of cephalic depression (head 
depth/HL X 100) 39-40, Cl 89, MI 31-32. 
Head shape as in text-figure 1 ; bottom of posterior ex- 
cision with a fine, low translucent lamella. Dorsal surface 
of head just inside of and parallel to the dorsal scrobe 
(lateral cephalic) border on each side with a shallow sulcus 
or broad depression. Occipital lobes massive, with convex 
apical surfaces. Antennal scrobes deep, overhung by strong, 
lamellar dorsal borders. Eyes situated a little in front of 
^Published with a grant from the Museum of Comparative Zoology 
at Harvard College. 
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