1959 ] 
Brown — Ant genus Strumigenys 
51 
pair on mesonotum ; one pair on petiolar node ; 3 pairs on postpetiole ; 
probably originally 6 rows of 6 hairs each on gastric dorsum (some 
apparently rubbed off). Large hairs fringing inner mandibular mar- 
gins (not shown in Figure 8) linear-spatulate, with rounded ends, 
predominantly perpendicular to the shafts of the mandibles. 
6. Punctulation denser and finer than in subedentata ; gastric 
dorsum predominantly smooth and shining, with a few feeble longi- 
tudinal costulae occupying about the basal fifth of the first tergum. 
Color light ferruginous with slightly more brownish gaster. 
Known only from the unique holotype worker (MCZ), labeled 
“Costa Rica/ F. Nevermann/ 18. VII. 31.” 
Key to the Species of the Strumigenys gundlachi Group, 
Based on Workers and Females 
1. Antennal scape 0.33 mm. or more long; large, dark-colored spe- 
cies with long mandibles (Fig. 4; Jamaica) 
jamaicensis Brown 
Antennal scape < 0.33 mm. long 2. 
2. Mandibles short and thick (MI < 56) ; robust species, worker 
HL mostly > 0.48 mm 3, 
Mandibles longer and slender (MI 56 or more) ; smaller species, 
worker HL mostly 0.48 mm. or less 4. 
3. Mandible very short in proportion to head (MI 48 in unique 
holotype), with exactly three small preapical teeth; ground pilos- 
ity of head nearly or quite obsolete; pronotum markedly flattened 
(Fig. 8; Costa Rica) trieces Brown 
Mandible a little longer proportionate to head (MI 53-54), with 
more than three preapical denticles ; ground pilosity abundant and 
conspicuous on head ; promesonotum strongly rounded, not de- 
pressed (Fig. 9; s. Mexico to s. Brazil) subedentata Mayr 
4. Mandibles very long and slender (MI > 70), bowed outward 
(Fig. 3; Trinidad to n. Argentina) denticulata Mayr 
Mandibles not so long (MI < 70), their shafts approximately 
straight 5. 
5. Spongiform appendages small but distinctly developed (Fig. 5) ; 
gastric dorsum of worker (when clean) predominantly smooth 
and shining, with a few basal costulae; female gaster commonly 
shagreened (Fig. 1 ; Caribbean countries) gundlachi (Roger) 
Spongiform appendages obsolete (Fig. 6) ; gastric dorsum with 
distinct fine, mostly opaque reticulation (Fig. 2; Brazil, Bolivia, 
Caribbean countries) eggersi Emery 
