Dryinus schoutedeni (Benoit, 1950)

Olmi, Massimo, Copeland, Robert S. & Noort, Simon Van, 2019, Dryinidae of the Afrotropical region (Hymenoptera, Chrysidoidea), Zootaxa 4630 (1), pp. 1-619 : 346-347

32. Dryinus schoutedeni (Benoit, 1950)

( Figs 140E, F )

Lestodryinus schoutedeni Benoit 1950b: 224 .

Dryinus schoutedeni (Benoit) : Olmi 1984: 778; 2006: 43; Azevedo et al. 2010: 892.

Description. ♀. Fully winged; body length 6.7–9.4 mm. Head reddish or reddish-dark, except mandible and clypeus testaceous; antenna black, except scape, pedicel and flagellomeres 6–8 testaceous; prothorax reddish or brown-reddish; rest of mesosoma black; metasoma brown; legs brown-black, except tarsi testaceous. In Madagascar there are two different forms: first form almost totally testaceous-reddish, except petiole black, metasoma brown and occasionally mesothoracic axilla blackish; second form almost totally black, except mandible, clypeus, malar space, anterior region of frons near clypeus, lateral regions of pronotum and posterior collar of pronotum testaceous; both forms with antenna testaceous, except antennomere 3 darkened. Antenna clavate; antennomeres of specimen from Zimbabwe, Chishawasha, in following proportions: 8:6:36:20:17:11:9:9:7:7. Head dull, granulate and slightly reticulate rugose; frontal line complete; occipital carina complete; lateral ocelli not touching occipital carina, situated on virtual straight line joining posterior edges of eyes; POL = OL = OPL; TL much longer than OPL. Pronotum ( Fig. 140E ) dull, granulate, with many keels around disc; pronotum crossed by strong anterior transverse impression and very strong posterior transverse furrow; anterior collar distinct; posterior collar long; pronotal tubercle not reaching tegula. Mesoscutum, mesoscutellum and metanotum dull, granulate, usually with numerous slight longitudinal keels (in specimen from Madagascar, 15°55’S 45°57’E, MG-38-20, mesoscutum very slightly granulate and without longitudinal keels; in specimen from Madagascar, 16°08’S 45°42’E, mesoscutum completely unsculptured). Notauli incomplete, approximately reaching 0.65 × length of mesoscutum. Metapectal-propodeal disc reticulate rugose, about 3 × as long as propodeal declivity; propodeal declivity reticulate rugose, with two longitudinal keels. Forewing with two dark transverse bands; distal part of 2r-rs&Rs vein about twice as long as proximal part. Protarsomere 1 about as long as 4; protarsomere 3 produced into hook. Enlarged claw ( Fig. 140F ) with one large subdistal tooth and one row of 18 lamellae. Protarsomere 5 ( Fig. 140F ) with two rows of about 34 lamellae; apex with about 13 lamellae. Tibial spurs 1/1/2.

♂. Unknown.

Material examined. Type: ♀ holotype: DEMOCRATIC REPUBLIC OF THE CONGO: Low Congo, Banana , 6.VIII.1920 , H. Schouteden leg. ( MRAC). Other material: MADAGASCAR: Antananarivo, Tsimbazaza Park , 1– 6.XI.1984 , YPT, Robert W. Brooks leg. ( NAMUK); Mahajanga, Analamanitra Forest , 14 km NE Misinjo, 15°55’S 45°57’E, 65 ft., 12–19.II.2008 , MT, dense dry forest, M. Irwin, R. Harin’Hala leg., MG-38-18, 1♀ ( CAS); same locality label, 16°08’S 45°42’E, 26.II–4.III.2008 , MG-38-20, 1♀ ( MOLC); Toamasina, near Vavatène , Manakam- bahiny, in forest, II.1995, 1 ♀ ( FSAE); Toamasina, 25 km W of Morarano-Chrome , in forest, 10–20.IV.1992 , 1♀ ( FSAE); Toamasina, Alaotra Lake , 3.XII.1990 , 1♀ ( AMNH); Toamasina, Garden of Alaotra Station , I.1991, 1 ♀ ( FSAE). SOUTH AFRICA: Gauteng, Pretoria, Faerie Glen , 25°46’S 28°17’E, 21.II.1995 , 1♀ ( CAS). ZIMBABWE: Harare, Chishawasha , V.1979 , A. Watsham leg., 1♀ ( NHMUK) .

Hosts. Unknown.

Distribution. Democratic Republic of the Congo, Madagascar, South Africa, Zimbabwe.

Remarks. The ♀ population from Madagascar is apparently characterized by a colour different from that of other African populations. The specimens from continental Africa, have the body partly testaceous-reddish (head and prothorax) and partly black, whereas the Madagascar population has the body totally testaceous-reddish or totally black. Only one totally black specimen is known (from Manakambahiny), whereas five testaceous-reddish specimens are known from Tsimbazaza Park, Alaotra Lake, 25 km W of Morarano-Chrome and Alaotra Station, and from 15°55’S 45°57’E. The small number of known specimens means that we need to postpone assessment of this population. These specimens from Madagascar have a morphology similar to that of the continental population; the only differences are in the colour. Possibly they are a different species. It is prudent to wait for further specimens, before reaching a decision on the status of this population. The testaceous-reddish specimens from Madagascar are 8.1 mm long, whereas the black specimen is 6.7 mm long. The main characters may be summarized as follows: antennomeres in following proportions: 12:6:53:30:23:16:12:10.5:8.5:10; POL = 2.5; OL = 2; OOL = 12; OPL = 2; TL = 6; distal part of 2r-rs&Rs vein longer than proximal part (19:10); Protarsomeres in following proportions: 31:4:9:27:41; enlarged claw with one large subapical tooth and one row of 15 lamellae; protarsomere 5 with two rows of approximately 41 lamellae; apex with at least 20 lamellae.

Figures

FIGURE 140. A: Dryinus pretorianus Olmi: hypopygium of ♂ from South Africa, Pretoria. B–D: Dryinus saussurei (Ceballos): head in dorsal view (B) and chela (D) of ♀ from Madagascar, Bekily; distal extremity of enlarged claw of ♀ from Madagascar, 18°01.35’S 44°03.02’E (C). E, F: Dryinus schoutedeni (Benoit), ♀ holotype: prothorax in lateral view (E) and chela (F). G: Dryinus seyrigi Benoit, holotype: prothorax in lateral view. Scale bar: A: 0.06 mm; B: 0.36 mm; C: 0.05 mm; D: 0.12 mm; E: 0.64 mm; F: 0.16 mm; G: 0.33 mm.