Stenamma vexator

This species is known only from Winkler and Berlese samples of sifted leaf litter. It occurs from approximately 1000–2000 m elevation and inhabits a variety of montane mesic forest environments (e.g. cloud forest, wet oak forest, oak-pine forest, tropical subevergreen forest, Liquidambar forest).

Distribution
Mexico (Atlantic slope).

Distribution based on Regional Taxon Lists
Neotropical Region: Mexico.

Nomenclature

 *  vexator. Stenamma vexator Branstetter, 2013: 263, figs. 165-168 (w.q.) MEXICO.

Worker
(29 measured) HL 0.62–0.78 (0.65), HW 0.55–0.71 (0.58), FLD 0.15–0.20 (0.16), PCW 0.04–0.06 (0.04), SL 0.50–0.67 (0.55), EL 0.10–0.15 (0.12), ACL 0.48–0.60 (0.50), ML 0.77–1.02 (0.85), PrW 0.39–0.49 (0.43), PSL 0.08–0.16, SDL 0.07–0.10 (0.09), PL 0.31–0.40 (0.34), PH 0.17–0.23 (0.19), PW 0.14–0.19 (0.15), PPL 0.15–0.22 (0.20), PPH 0.16–0.21 (0.17), PPW 0.17–0.22 (0.19), MFL 0.53–0.76 (0.60), MTL 0.45–0.62 (0.48), CI 89–96 (89), SI 85–98 (94), REL 18–22 (21), FLI 25–29 (28), PSI 1.1–1.8 (1.6), PI 53–59 (59), MFI 93– 107 (97), ACI1 65–71 (68), ACI2 87–98 (92) Small- to medium-sized species; general body color black, or dark brown to red-brown (type population), with appendages brown to orange-brown or yellow-brown, lighter in joints and toward extremities; setae golden brown; mandible with 6 teeth, 2 teeth nearest basal tooth sometimes more worn and less distinct, basal tooth often well-defined, projecting; basal margin of mandible usually sinuous, with a slight basal depression (type population), but without a tooth, some populations with basal margin almost straight; mandible mostly smooth, with scattered piligerous punctae, and some striations near base and along lateral surface; median lobe of clypeus with a pair of faint longitudinal carinulae that diverge anteriorly, apex of lobe with a short transverse carinula, remainder of clypeus mostly smooth; area in between median lobe and anterior clypeal margin forming a distinct concavity where mandibles insert; posterior extension of clypeus between frontal lobes of moderate width (PCW 0.04–0.06), with sides subparallel; frontal lobes of moderate width (FLD 0.15–0.20, FLI 25–29), not greatly covering torular lobes in full-face view; head roughly oval-shaped (CI 89–96), with posterior margin flat to slightly depressed medially; eye of moderate size (EL 0.10–0.15, REL 18–22), oval-shaped, with 5–8 ommatidia at greatest diameter; face usually strongly sculptured, mostly rugoreticulate, with some longitudinal rugae along midline (type population), some populations with sculpture somewhat polished and reticulate less distinct; scape of moderate length (SI 85–98), just reaching posterior margin of head when laid back; surface of scape mostly smooth, with scattered piligerous punctae; flagellum with distinct 4-segmented antennal club; mesosoma usually completely sculptured (type population), but some populations shinier overall and with pronotum mostly smooth and shiny; pronotal dorsum longitudinally rugose, with rugae dense to somewhat sparse and irregular, rugae usually becoming punctae and reticulae on dorsum of mesonotum; side of pronotum mostly punctate or rugose, often with a small to large patch of smooth cuticle on ventral half; mesopleuron and side of propodeum rugulose-punctate; propodeal dorsum with rugoreticulae near anterior margin, changing to transverse carinulae near posterior margin; promesonotum in profile low-domed, slightly asymmetrical, with apex posterior of midpoint, anterior declivity of pronotum sometimes forming a sharp transition with dorsum, sculpture on declivity punctate, contrasting with rugose dorsum; metanotal groove usually well-demarcated, of moderate depth and width; propodeal spines tuberculate to short (PSL 0.08–0.16, PSI 1.1–1.8), often somewhat robust (type population); petiole in profile often distinctive, appearing somewhat elongate (PL/HW 0.53–0.56), with node broadly rounded and pointed posteriad, venter under node often with a small concavity; peduncle sometimes noticeably slender, thickening toward node; postpetiole in profile subspherical, similar in size to petiolar node (PPH/PH 0.85–0.91); anterior face of petiolar and postpetiolar nodes smooth, remainder of waist mostly punctate; gaster mostly smooth and shiny, with scattered piligerous punctae; pilosity on head, short and bilayered, with some longer suberect setae, and many shorter decumbent setae, remainder of body dorsum with longer suberect setae; pilosity on gastral dorsum predominately suberect and relatively sparse; setae on scape mostly subdecumbent; setae on legs mostly subdecumbent to appressed, with some longer suberect setae on femoral venters and coxae.

Queen
(11 measured) HL 0.66–0.77 (0.66), HW 0.60–0.70 (0.60), FLD 0.17–0.20 (0.18), PCW 0.05–0.07 (0.05), SL 0.53–0.64 (0.53), EL 0.18–0.20 (0.18), ACL 0.50–0.60 (0.51), ML 0.94–1.13 (0.94), PrW 0.53–0.64 (0.54), PSL 0.14–0.17 (0.15), SDL 0.09–0.12 (0.09), PL 0.37–0.44 (0.38), PH 0.19–0.23 (0.20), PW 0.16–0.19 (0.17), PPL 0.18–0.22 (0.20), PPH 0.18–0.23 (0.19), PPW 0.20– 0.24 (0.20), MFL 0.59–0.75 (0.59), MTL 0.49–0.61 (0.51), CI 90–95 (92), SI 84–95 (87), REL 28–30 (30), FLI 26–30 (29), PSI 1.3–1.8 (1.6), MFI 90–104 (102), ACI1 65–68 (68), ACI2 88–98 (96).

Same as worker except for standard queen modifications and as follows: pronotum with transverse rugae and rugoreticulae on lateral surface, changing to carinulae and punctae mesad; mesoscutum densely longitudinally rugose; scutellum rugose to rugoreticulate, sometimes with a smooth patch mesad; side of propodeum rugulose, with faint punctae, dorsum with transverse carinulae; wing venation as in Figure 167D.