Leptogenys oaxaca

Distribution
This taxon is known from southern Mexico.

Castes
Queen, male. Unknown.

Nomenclature

 *  oaxaca. Leptogenys oaxaca Lattke, 2011: 162, fig. 19 (w.) MEXICO.

Worker
Metrics, holotype (paratype): HL 1.95 (2.15); HW 1.95 (1.85); ML 1.50 (1.55); EL 0.40 (0.40); SL 2.45 (2.25); PW 1.35 (1.25); WL 3.60 (3.50); PH 1.30 (1.25); PL 1.20 (1.15); DPW 0.85 (0.85) mm. CI 1.00 (0.86); MI 0.77 (0.84); OI 0.21 (0.22); SI 1.26 (1.22); LPI 1.08 (1.09); DPI 0.71 (0.74).

Head in full-face view slightly wider anterad than posterad, posterior margin convex, lateral margin broadly convex, both margins forming continuous curve without sharp curvatures or angles. Median clypeal process apically truncate, lateral lobes present; anterior clypeal margin without translucent lamella. Eye dorso-laterally placed, not touching lateral cephalic margin in cephalic full-face view, slightly closer to median cephalic length than to mandibular insertion, length close to one-fourth that of lateral cephalic margin. Scape surpasses posterior cephalic border by approximately one-third its length; third antennal more than 2 x length of second, almost as long as combined lengths of fourth and fifth segments. Head finely striate to rugulose, opaque; clypeus shining; basal margin of mandible shuts tight against clypeus, basal angle blunt, followed by abrupt but even, long concavity, more or less parallel to cephalic dorsum; concavity followed by pre-apical angle and brief pre-apical margin that follows a ventrally directed angle; mandibular dorsum with scattered piligerous punctae and fine, longitudinal parallel strigulae. Closed mandibles form rounded aperture resembling a wire-stripper. Basal third of external mandibular margin straight, the rest sharply convex. Posterior labium smooth and shining, maxilla with curved carinae; ventral cephalic surface shining and smoother than dorsal surface; palpal formula 4,3.

Mesosoma with dorsal margin divided by deeply impressed metanotal groove in lateral view, posterior mesonotal margin forming sharp angle; pronotal dorsal margin convex, mesonotal margin broadly convex to straight; propodeal dorsal margin convex, more than twice as long as declivity; short propodeal denticle projects posterad at spiracular height, spiracle round to oval. Meso-metapleural suture distinctly cleft, lateral propodeal and metapleural surface forming convexity; metapleural-propodeal suture ill-defined, propodeal declivity with transverse strigae. Mesonotum longer than wide, transversely strigulose. Pronotal disc mostly with slightly diverging rugulae, rugulae becoming transverse along posterior margin. Propleuron with oblique parallel, strigae; mesopleuron transversely strigulate, strigulae extending to mesosternum, no carina separates mesopleuron from mesosternum. Anterior mesosternal lobe low, height less than one-fourth mesocoxal height; metasternal lobe apically truncate, height more than one-fourth metacoxal height.

Anterior and dorsal petiolar margins in lateral view form continuous convexity; posterior margin slightly sinuate; sculpture fine strigulae, opaque. Node in dorsal view longer than wide, anterior margin straight and wider than half the posterior margin; posterior node face relatively smooth with faint transverse strigulae, shining. Gaster shining with abundant piligerous punctulae. Stridulitrum visible on pretergite of abdominal segment IV. Body with abundant appressed pilosity and standing hairs; scape with appressed pilosity and no standing hairs. Head, mesosoma, and node dark brown to black, gaster brown to dark brown; mandible, scape, metacoxa dark brown; funiculus, and rest of legs ferruginous. Protarsal claws as densely pectinate as meso and metatarsal claws. Some parts of mesosoma, cephalic ventrum and coxa may have discrete blue iridescence. Protarsal segments ending with two pairs of fine setae.

Type Material
Holotype worker. Mexico, Oaxaca, 6 miles S Valle Nacional, 20.vii. – 01.viii.1971, A. Newton collector. One worker deposited in the. – Paratype. One worker with same data as the holotype, deposited in the MCZC.