Pheidole yeensis

Identification
This species is characterized among Indo-Chinese species by the combination of the following features: in the minor dorsum of head and mesosoma sparsely bearing relatively thick standing hairs; in the major head in lateral view strongly impressed on vertex; in the major hypostoma at most with inconspicuous median and submedian processes; in the major and minor promesonotal dome in lateral view with a low mound on its posterior slope; in the major first gastral tergite longitudinally rugoso-punctate entirely.

This species is similar to Pheidole planifrons Santschi among Indo-Chinese species (see under P. planifrons).

Distribution
Known from the Indo-Chinese subregion.

This taxon was described from Myanmar.

Nomenclature

 *  yeensis. Pheidole sulcaticeps r. yeensis Forel, 1902c: 179 (s.) MYANMAR. [Also described as new by Forel, 1902f: 544.] Bingham, 1903: 253 (w.). Subspecies of sulcaticeps: Emery, 1921f: 94. Raised to species: Bingham, 1903: 252; Wu & Wang, 1995: 102. See also: Eguchi, 2008: 107.

Worker
Eguchi (2008) - Major (n=5). — HL 2.01–2.09 mm; HW 1.77–1.83 mm; CI 85–89; SL 0.94–0.99 mm; SI 53–55; FL 1.55–1.61 mm; FI 87–88. Minor (n=5). — HL 0.73–0.93 mm; HW 0.58–0.77 mm; CI 79–83; SL 0.86–0.97 mm; SI 126–149; FL 0.97–1.23 mm; FI 160–170.

Major — Head in lateral view strongly impressed on vertex; frons rugose longitudinally, with interspaces weakly punctured; vertex and dorsal and dorsolaeral faces of vertexal lobe reticulate or rugoso-reticulate, with enclosures weakly punctured; frontal carina well developed, partly overhanging antennal scrobe; median longitudinal carina of clypeus absent, inconspicuous or weak; hypostoma without conspicuous median and submedian processes, but with conspicuous lateral processes; outer surface of mandible smooth excluding its basal area, bearing short appressed hairs; antenna with a 3-segmented club; maximal diameter of eye longer than antennal segment X. Promesonotal dome in dorsal view transversely rugoso-reticulate, with enclosures weakly punctured, in lateral view with a low or inconspicuous mound on its posterior slope; humerus very weakly produced laterad; the dome at the humeri a little narrower than or almost as broad as at the bottom. Petiole (a little) longer than postpetiole (excluding helcium); petiolar node in rear view weakly concave mediodorsally; postpetiole not massive. First gastral tergite longitudinally rugoso-punctate entirely.

Minor — Dorsum of head and mesosoma sparsely bearing relatively thick standing hairs; frons and vertex smooth or shagreened; dorsolateral part of head often rugoso-punctate weakly; preoccipital carina conspicuous dorsally and laterally; median part of clypeus largely smooth; median longitudinal carina of clypeus absent, or present but weak; antenna with a 3-segmented club; scape extending far beyond posterolateral margin of head; maximal diameter of eye almost as long as or shorter than antennal segment X. Promesonotal dome smooth entirely, or almost smooth dorsally and weakly rugoso-punctate dorsolaterally (and laterally); the dome in lateral view with a low mound on its posterior slope; humerus of the dome in dorso-oblique view not produced; mesopleuron, metapleuron and lateral face of propodeum well punctured. Petiole (a little) longer than postpetiole (excluding helcium); postpetiole relatively large but not massive.

Type Material
Eguchi (2008) - Syntype: 1 major, “Birmah (Bingham) Ye Valley CCI 14” [Myanmar],, examined, designated as the lectotype.