Adults of these populations can be separated based on the shape and size of their humeral and apical spots, clypeal
fork, mesometasternal process and parameres, as well as pronotal and ventral background colour.
cambrai with the dicranius and mirabilis species-groups, but it is distinctly separated from both these species-groups by the lack of a clypeal
horn (in males), or by the apex of clypeus truncate or slightly sinuate, not bidentate (in females).
43); rectangular area separating cephalic and clypeal
Bronze; with clypeal
teeth small and sharply upturned; frons with dense tuft of long white setae projecting forward (Fig.
height about twice AME diameter; chilum divided (Fig.
Abbreviations an, antenna; ce, compound eye; cg, clypeal
groove, cl, clypeus; cp, clamp; lb, labium; lb 1 & lb 2, labial segments 1 & 2; lg, labial groove; ls, labial sensilla; md, mandibular stylets; mx, maxillary stylets; rs, retracted/looped stylets; sf, salivary flange; so, stylet-holding organ; st, stylets.
ETYMOLOGY: The specific name is derived from two Latin words: tri- (= three) and dentata (= dentate), which refers to the anterior clypeal
margin of the female, which has a medial set of three teeth.
prominence medially with shallow, triangular emargination (Fig.
Body dull, clypeal
margin widely rounded; pronotum with coarse punctures concentrated around smoother, finely uniformly punctate median anterior disc; coarse pronotal punctures on sides separated by one their diameter or more.
eye-contact: clypeus touching the eyes = 0; clypeus narrowly separated from the eyes = 1 5.
tubercle (CI) with 2 barbulate macrosetae (ML), 2 smooth setae (mi).
suture bent back angularly at middle, often small depression at apex of angle; head not transversely carinate 7 -- Clypeal
suture either straight at middle or not visible among punctures; head behind clypeal
suture transversely carinate, at least at sides 10 7.