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40, hy) long, with broad-based rounded-truncate dorsobasal lobe, posterior bridge dorsally and ventrally produced (rounded to slightly angulate in profile); hypandrial arms narrow basally, expanded apically (viewed laterally), with 2 setulae proximal to postgonite, the more lateral ventrally directed, the medial ventromedially directed (obscured by epandrium on Fig.
Head with epistoma feebly convex on disc, finely subregularly sparsely punctured, punctation somewhat denser and coarser distally; clypeus faintly sinuate at middle, rounded at sides, almost thickly bordered, the edge upturned; genae subauriculate, obtusely angulate, elongately ciliate, distinctly protruding more than eyes; frontal suture finely impressed, nearly faint at middle; front relatively somewhat densely punctured.
2 --Propodeum in side view convex to angulate, never dentate (as in Fig.
Mesonotum dark yellow with anterior and lateral portions blackish; clasping cercus without separate tubercle at base; basiphallus rather narrow without angulate posterior process in lateral view
sakalava Tsacas, which has a conspicuous basomedial keel on the distiphallus, shares the similarly-shaped hypandrium, with the broad-based, wide and angulate dorsobasal lobe and broad hypandrial arms, and this species is here tentatively ascribed to the same complex, pending a detailed phylogenetic analysis.
Lateral margins of labrum broadly rounded posteriorly, not angulate .
albinae; median dorsal carina from slightly elevated to almost obsolete, lateral carinae absent; anterior margin evenly rounded to almost straight, posterior margin either rounded or slightly angulate in different species; prosternal tubercle spiniform, slightly retrorse.
All femora are claviform and dentate internally; the internal margin of each tibia is strongly sinuate, meso- and the hindtibia is angulate or toothed on the outer edge towards the apex; tarsal claws are cleft, and subapproximate at the base.
The upper apex of the first antennal flagellomere is angulate or pointed in Chaetopsis (Fig.
5-1 diameters; lateral borders strongly angulate, lateral marginal bead crenulate, with long, curved setae; basal bead indicated by punctures on most of it extension; anterior angles obtuse, slightly prominent; posterior angles obtuse, clearly prominent.