1962] 
Brown — Strumigenys 
265 
Antennal scrobes: Broad longitudinal excavations or grooves, one 
on each side of the head above the eye, for the reception of the folded 
antennae. 
Apical fork: The two large teeth at the extreme apex of the mandi- 
ble, converging to form a U or V ; between them may occur one or 
more intercalary denticles (Figs. 9-21). 
Basal costulae (basigastric costulae) : Numerous raised longitudinal 
lines of the integumental sculpture originating from the base of the 
first gastric segment (tergite) and extending caudad for distances 
varying with the species (Figs. 5, 6) . 
Basal tooth (or lamella) : A process, usually digitiform or denti- 
form, arising from the inner mandibular border at its base, and usually 
covered by the clypeus when the mandibles are closed; not to be con- 
fused with the preapical teeth. 
Flagelliform hairs: Very long, slender, tapered setae, often wavy, 
looped or otherwise contorted, i.e., whip-like (Figs. 4, 6). 
Intercalary tooth (or denticle) : Abbreviated “ID,” a tooth (or 
denticle) occurring between the main teeth of the apical fork of the 
mandible, or as a spur on the inner side of one of the main teeth (Figs. 
18-21 ) . 
Preapical tooth (or denticle) : Abbreviated “PT,” a tooth (or 
denticle), one or more of which occur along the inner mandibular 
border proximal to the apical fork, but not at or beneath the clypeal 
margin; not to be confused with the basal tooth, q. v. (Figs. 3, 4, 
7-16). 
Propodeal lamella: One of a pair of raised lobes or flanges guard- 
ing the sides of the propodeal declivity, sometimes incorporating the 
(dorsal) propodeal tooth and/or a ventral (metasternal or meta- 
pleural) tooth or angle (Figs. 5, 6, 22-28). 
Remiform hairs : Setae with a more or less oar-like form ( Fig. 5 ) . 
Spongiform appendages : Lobes, flaps and collar-like strips of light- 
colored spongy integumental material situated in definite, symmetrical 
positions on the petiole, postpetiole and anteroventral face of the gaster 
(Figs. 5, 6), and sometimes even on the alitrunk, in the higher dace- 
tines and a few other ants. Their function is unknown. 
