Dinetus arabicus, Jacobs, 2021

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 : 90-91

Key to species: Females

Unknown: D. arabicus sp. nov., D. schmideggeri sp. nov.

1. Vertex, frons and thorax without long erect setae. Scutum without appressed silver pubescence. Outer vein of subdiscoidal cell (cu) vertical, parallel with the nervulus (cu-a) (see fig. 1) or oblique, converging with the nervulus (see fig. 2).......... 2

- At least scutum and mesopleuron with long erect setae, often also frons and vertex and/or scutum with covering of appressed silver pubescence. Outer vein of subdiscoidal cell (cu) vertical, parallel with the nervulus (cu-a) (see fig. 1) (Dentidinetus). ................................................................................................. 13

2 (1) Scutum more or less dull, densely punctured or reticulated (fig. 10). Anterior margin of clypeus medially with two long teeth (fig. 7). Outer vein of subdiscoidal cell (cu) vertical, parallel with the nervulus (cu-a) (see fig. 1) ( Dinetus s. str.)........ 3

- Scutum shiny, with scattered or reduced punctures (figs 9, 11). Anterior margin of clypeus with short teeth or rounded. Outer vein of subdiscoidal cell (cu) oblique, almost converging with the nervulus (cu-a) (see fig. 2) (Venustidinetus).......... 4

3 (2) Tergum IV with distinct punctures. Propodeal enclosure with oblique striae, between the striae finely reticulated (fig. 17). Fore tarsal rake with distinctly broadened spines (fig. 5). Europe, West Asia...................... D. pictus Fabricius

- Tergum IV without punctures. Propodeal enclosure dull, with more or less distinct short striae in the central part, lateral parts finely reticulated, without any striae (fig. 18). Fore tarsal rake with narrow spines (fig. 6). Algeria, Tunisia........................................................................................... D. simplicipes E. Saunders

4 (2) Head, mesosoma and metasoma predominantly black....................................................... 5

- Head, mesosoma and metasoma predominantly pale, yellow or ochraceous...................................... 8

5 (4) Propodeum with conspicuous appressed silver pubescence, at least on lateral parts................................ 6

- Propodeum without conspicuous silver pubescence, at most with scattered erect pale setae. Propodeal enclosure shiny, very finely reticulated or with distinct transverse striae.......................................................... 7

6 (5) Propodeal enclosure chagrined, with oblique striae basally and transverse striae apically. Mid femur black. Tibiae and tarsi of mid and hind legs completely black. Tunisia................................ D. tunisiensis Khedher & Mokrousov

- Propodeal enclosure dull, distinctly granulated. Mid femur with ivory spot posteroventrally. Mid and hind tibiae yellow or ivory with dark underside. Mid and hind tarsi ferrugineous. Morocco....................... D. venustus de Beaumont

7 (5) Propodeal enclosure shiny with distinct transverse striae. Prothorax laterally reddish. Head mainly black with diffuse yellow spots on gena, on inner border of eyes and above antennal base. Jordan........................ D. jordanicus sp. nov.

- Propodeal enclosure brilliantly shiny with a network of obsolete reticulation, without transverse striae. Prothorax laterally black. Head completely black except the medial part of mandible. Oman................... D. porcellaneus Guichard

8 (4) Head and body nearly completely yellow without whitish or ivory spots; black are vertex, central part of scutum and narrow stripe on propodeal enclosure. Legs yellow. Propodeal enclosure with strong horizontal striae (fig. 13). North Africa......................................................................................... D. cereolus Morice

- Head, body and legs ochraceous or ferrugineous, often with black and ivory spots. Structure of propodeal enclosure different................................................................................................ 9

9 (8) Vertex predominantly ochraceous, black only between the ocelli. Mesoscutum ochraceous or brown, only posterior margin black. Propodeum ochraceous or predominantly so........................................................ 10

- Vertex completely dark brown or black. Mesoscutum predominantly black or dark brown. Dorsal area of propodeum black or yellow............................................................................................ 11

10 (9) Lateral parts of propodeum with appressed silver pubescence. Propodeal enclosure finely reticulated, with distinct horizontal striae and narrow darkened median stripe (see fig. 16). Legs yellow, fore and mid femora ventrally with ivory spot, hind tibia with dorsal ivory stripe.......................................................... D. pulawskii de Beaumont

- Lateral parts of propodeum without appressed silver pubescence. Propodeal enclosure monochrome ochraceous, very finely chagrined (fig. 12). Legs ochraceous, without ivory patches.................................. D. deserticus sp. nov.

11 (9) Propodeum completely ochraceous. Metasomal segments IV‒V dark brown, segments I‒III with ivory lateral spots........................................................................................... D. hameri Notton

- Dorsal area of propodeum black. Metasoma completely ochraceous or red, at most segment II with ivory lateral spots... 12

12 (11) Entire propodeal enclosure with fine oblique striae (fig. 15). Tergum II with ivory spots. Egypt, Arabian Peninsula.................................................................................... D. nabataeus de Beaumont

- Propodeal enclosure more or less rugose with median furrow and some short horizontal rugae. Metasoma completely ochraceous, without ivory spots. East India....................................................... D. politus Turner

13 (1) Mesopleuron pale yellow. Frons and vertex with erect setae at most as long as diameter of front ocellus or without long erect setae. Scutum without long erect setae, always covered with dense silver pubescence masking the sculpture........... 14

- Mesopleuron partly black. Frons and temple with erect setae longer than diameter of front ocellus. Scutum with long erect setae, with or without appressed pubescence masking the sculpture........................................... 15

14 (13) Propodeal enclosure yellow with black lateral margins. Tergum I pale yellow. Kazakhstan..... D. psammophilus Kazenas

- Propodeal enclosure black except yellow spots basally and apically. Tergum I light brown with large ivory band apically. United Arab Emirates................................................................ D. vanharteni sp. nov.

15 (13) Propodeum dorsally with pale lateral parts, apically converging (sometimes reduced to spots laterally and basally on propodeal enclosure). Mid femur yellow, partly reddish or black. Scutellum completely or mainly yellow. Thorax ventrally yellow or with yellow spots, sometimes with red spots, rarely black. Scutum mostly with dense silvery pubescence masking the sculpture.......................................................................................... 16

- Propodeum dorsally black. Mid femur black or inside with black spot. Scutellum black, at least apically. Thorax ventrally black; if with yellow spots, then mid femur with black spots. Scutellum at least black in apical half. Scutum without dense silvery pubescence masking the sculpture................................................................ 18

16 (15) Mandible ventrally with pointed tooth apically, and obtuse tooth medially, with obvious notch between the teeth. Median lobe of clypeus nearly curved like a roof. Mid and hind legs without black spots. Central Asia.......... D. turanicus Kazenas

- Mandible in frontal view evenly rounded. Mid legs and hind legs basally with brown or black spots dorsally. Scapus yellow with black stripe on reverse face....................................................................... 17

17 (16) Propodeal enclosure laterally with more or less broad yellow stripe. Median lobe of clypeus evenly rounded. North Africa, Arabian Peninsula, Central Asia..................................................... D. dentipes E. Saunders

- Propodeal enclosure black with small yellow spots anterolaterally and posteriorly. Medial lobe of clypeus with two long parallel teeth.............................................................. D. rakhimovi Mokrousov & Khedher

18 (15) Antennomere 3 at least 5× as long as broad. Apical margin of clypeus with triangular teeth. Scape nearly completely brown or black. Hind femur black at least basally. Central Asia.................................... D. arenarius Kazenas

- Antennomere 3 at most 4× as long as broad. Apical margin of clypeus with rounded teeth. Anterior site of scape yellow. Hind femur completely reddish. Kazakhstan.................................................. D. wojciechi Kazenas