Table 2 Morphological variables used in the systematic treatment and morphometric analyses

HL

Head length. In full-face view, the maximum distance from the posterior margin of the head to the anterior margin of the clypeus

HW

Head width. In full-face view, the maximum width of the head, excluding the eyes

EL

Eye length. In lateral view, eye length is measured along its maximum length

SL

Scape length. In frontal view, the maximum length of the scape excluding the basal condyle and neck

OMD

Ocular mandibular distance. In lateral view, the distance from mandibular insertion to the anterior eye margin

PrW

Pronotum width. In dorsal view, the maximum width of the pronotum

WL

Weber’s length. In lateral view, the distance between the anterior margin of the pronotum, excluding the collar, to the posteroventral margin of the metapleuron

MsW

Mesonotum width. In dorsal view, the maximum width of the mesonotum

MsL

Mesonotum length. In dorsal view, the maximum distance from the anterior margin of the mesonotum to its posterior margin

PW

Petiolar width. In dorsal view, the maximum width of the petiole

PH

Petiolar height. In lateral view, the perpendicular distance from the posteroventral lobe of the petiolar tergite to its maximum dorsal margin

PL

Petiolar length. In lateral view, the distance between the anterior margin of the petiole, including its anterolateral projection, to its posterior margin, excluding the posteroventral folded ridge that embraces the helcium

CI

Cephalic index: HW/HL

OI

Ocular index: EL/HW

SI

Scape index: SL/HW

MsI

Mesonotum index: MsW/MsL

LPI

Lateral petiolar index: PL/PH

DPI

Dorsal petiolar index: PW/PL