Dinetus (Dentidinetus) arenarius Kazenas, 1973

Jacobs, Hans-Joachim, 2021, A review of Dinetus Panzer, 1806 with descriptions of five new species and keys to world species (Hymenoptera, Crabronidae), Zootaxa 5061 (1), pp. 69-94 : 71

Dinetus (Dentidinetus) arenarius Kazenas, 1973

( Figs 19‒22 )

Dinetus arenarius Kazenas, 1973: 16 , ♀, ♂. Holotype: ♀, Kazakhstan: Ili area (ZIN).

Description female. Dorsal and lateral view: figs 19, 20.

Colour. Head black, with narrow ivory stripes on inner and outer orbits; lateral parts of clypeus yellow. Mandible yellow with brown apex. Antenna black, antennomere 3 with ivory basal spot. Pronotum black with ivory anterior and posterior margin. Pronotal lobe ivory. Scutum black. Scutellum black with ivory hind margin (sometimes reduced). Metanotum ivory. Pronotal lobe ivory. Mesopleuron black with little spot below the insertion of fore wing. Metasoma orange with ivory spots on terga I, II and VI. Fore and mid legs black, underside of femora with ivory parts apically, upside of tibiae yellow. Tarsi light brown. Hind coxa and trochanter black. In specimens from Mongolia hind femur more or less red with black base, hind tibia red with ivory upper side, tarsus light brown. In specimens from Kazakhstan hind femur black, hind tibia black with ivory upper side, middle and hind basitarsus black (see remark).

Morphology. Vertex, scutum, mesopleuron and scutellum with fine scattered puncture, shiny. Lateral parts of propodeum dull, with reticulated microsculpture. Propodeal enclosure reticulated with fine transverse rugae in the area of central line. Terga with silky microsculpture. Head, thorax and legs with long white erect and appressed setae, partly covering the integument. Propodeal enclosure laterally limited by dense stripe of appressed silver setae. Outer vein of subdiscoidal cell (cu) of fore wing vertical, parallel with the nervulus (cu-a) (see fig. 1). Fore tarsal rake with long spines, much longer than diameter of the tarsomere. Body length 6.0– 6.5 mm.

Description male. Dorsal and lateral view: figs 21, 22.

Colour. Like the female, posterior margin of scutellum ivory. Yellow are clypeus, frons except the central upper part, front side of scape, parts of the femora and tibiae of fore- and mid-legs. Antenna short and stout, antennomere 3 as long as broad.Antennomeres 2–5 with yellow stripe on the upper side, antennomeres 6–12 with polished concave underside. Segment I of the metasoma with big ivory central spot distally.

Morphology. Femur of foreleg with tooth in the distal half. Terga III–V more strongly punctured than in female. Body length 5.0– 5.5 mm.

Remark. Specimens from Mongolia differ from those from Kazakhstan by the red hind tibia and tarsus, apically red hind femora to a variable extent and partly red mid femora. Kazenas (1973, 2000) did not mention the red colour of femora in specimens from Kazakhstan. Specimens from China agree with those from Mongolia in colour ( Du et al. 2019). Females from Mongolia are mostly without transverse rugae on the dorsal area of propodeum and with reduced pale markings on the anterior terga.

Distribution. Kazakhstan (type locality), Mongolia (see below), China (Inner Mongolia) ( Du et al. 2019).

Examined material. KAZAKHSTAN: 3 ♀♀ Charyn valley W Chundza , 650 m, 43°37’N 79°21’E, 31.05.2001, Hauser leg. ( CSE) . MONGOLIA: 1 ♂ 8 ♀♀ Domogoy reg. stepp 28 km SE Chatan-Bulag, 03.08.2007, M. and J. Halada leg.(photo ♂ ♀) ( OLML) ; 2 ♀♀ with same data, M. Kadlecova leg. ( OLML) ; 1 ♂ 1 ♀ Bayankhongor 75 km S, N45.70 E100.48,5, 1330 m, 08.07.2007, J. Halada leg. ( OLML) ; 3 ♀♀ 70 km S Saynshand , 1100 m, 06.08.2007, J. and M. Halada leg. ( OLML) ; 2 ♀♀ Domogov reg., 2 km SE Khuvsgol, 5.8.2007, M. Halada leg. ( OLML) ; 70 km S Saynshand , 1100 m, 6.8.2007 M. Halada leg. ( OLML) .

Figures

FIGURES 19–26. View dorsal and lateral: 19–20 D. arenarius ♀, 21–22 D. arenarius ♂, 23–24 D. dentipes ♀, 25–26 D. dentipes ♂. (phot. Luhn) (scale bar 1 mm)