1953] 
Brown — Strumigenys 
3 
(2) Metanotal groove as distinct as in S. louisianae 
or slightly more so; posterior mesonotal region a bit more 
strongly concave and slightly more distinctly constricted. 
(3) Petiolar node with a more slender peduncle and 
the anterior face not so strongly obliquely depressed, the 
summit rather evenly rounded in profile seen from the 
side; node only slightly broader than long seen from above. 
(4) Dorsum of postpetiole for the most part smooth 
or nearly so, definitely shining. Gastric dorsum at base 
with a few feeble costulae, basal tergite only feebly reticu- 
late (covered with a whitish dried film possibly represent- 
ing a secretion) and with anterior part subopaque, but 
sides and posterior half moderately but definitely shining. 
Sculpture over entire body a trifle weaker than in S. 
louisianae. 
(5) Pilosity in general a little less abundant and con- 
spicuous; ground pilosity vestigial on alitruncal dorsum. 
Color ferrugineous. 
Holotype (Borgmeier Coll.) taken at Petropolis, State 
of Rio de Janeiro, Brazil; “gesiebt. Nr. 5884” (T. Borg- 
meier leg.) 
Paratypes: 5 workers (Borgmeier Coll., USNM, MCZ) 
with data as for holotype. TL 2.54-2.76 mm., HL 0.60-0.65 
mm., ML 0.39-0.41 mm., WL 0.58-0.62 mm.. Cl 71-76, MI 
63-66. 
Strumigenys producta new species 
Holotype worker: TL 2.91 mm., HL 0.65 mm., ML 0.45 
mm., WL 0.70 mm.. Cl 81, mi 69. 
Very similar to S. louisianae, but larger, more slender, 
and with much longer mandibles. Dentition as in S. louisu 
anae and S. clasmospongia, that is, with a single small 
preapical tooth and two acute intercalary denticles to the 
apical fork. Also the following differences from S. louisi- 
anae : 
(1) Propodeal spines more slender and acute, rather 
strongly elevated, divergent, longer than the distance be- 
tween the centers of their bases. 
(2) Gastric tergite I with fine basal costulae extending 
