Plesianthidium (Spinanthidiellum) haematurum (Cockerell)

(Figs 14–15)

Dianthidium haematurum Cockerell, 1932: 524 –525 (holotype—♂ ‘Cape Province: Calvinia, Nov. 12 (W.P.C.)’ (NHML, examined) South Africa); Eardley & Urban 2010: 238.

Diagnosis. This species, known only from the male, can be distinguished from all species, except P. volkmanni and P. rufocaudatum by the carinate preoccipital ridge and small lateral projections on T7 (Fig. 15 e). From these it can be distinguished by the combination of the black paraocular area and the structures of T7 (Fig. 15 e) and S6–S8 (Figs 15 f–h), which are unique.

Description. Female. Unknown.

Male. Lengths: face 3.0 mm; scutum 4.4 mm; forewing 7.7 mm; body 7.3 (type)– 8.2 mm. Integument black, except clypeus partly yellow (mediolongitudinal and / or dorsal regions region black); T2–T4 sometimes with reddish distal margins, T5–T7 orange (Fig. 15 d). Vestiture orangish above, whitish below; metasomal terga lacking distal fasciae. Preoccipital ridge carinate; distance between lateral ocellus and preoccipital ridge 1.5–2.0x ocellar diameter; paraocular area black; supraclypeus distinctly convex; clypeus distinctly convex, moderately densely punctate; mandible with three distinct teeth; maxillary palpus 2-segmented; scutum densely punctate medially, shiny between punctures; tegula densely punctate; propodeum glabrous medioventrally; hind trochanter without ventral spine; T2–T5 without distal fasciae; T6 with slight mediolongitudinal carina, with slight point posteromedially, without lateral spines (Fig. 15 d), with distal margin impunctate, forming slightly convex, translucent, slightly up-curved distal flange, longer laterally than mesally; T7 posterior edge tridentate, lateral spine rounded, median spine narrowly truncate (Fig. 15 e); S4 with moderately wide black apicomedian comb; S5 broadly emarginate posteromedially; S6 with obtuse posterolateral and posteromedian angles (Fig. 15 f); S7 disc short, broadly and deeply (angulately) concave posteriorly (Fig. 15 g); S8 with disc long, narrowly concave posterolaterally, truncate posteromedially, sides straight (Fig. 15 h); gonostylus narrow subapically (Fig. 15 i).

Distribution (Fig. 14). This species is known only from the type locality, Calvinia in the Western Cape Province, and from Aus in southern Namibia.

Material examined. Type material. Male holotype of Dianthidium haematurum Cockerell: ‘ Type, B.M. TYPE HYM. 17a 1929, Dianthidium haematurum Ckll. TYPE, T.D.A. Cockerell. B.M. 1936-415, Calvinia C.P. Nov. 12 WPC’, in NHML.

Additional material. Namibia. Klein-Aus Vista, 26.44.10S 16.ix.50 E, 24.ix.2003, F.W & S.K. Gess (1♂ AMGC).