Dinetus deserticus, 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 : 91-92

Key to species: Males

Unknown: D. cereolus Morice , D. deserticus sp. nov.; D. hameri Notton , D. rakhimovi Mokrousov & Khedher , D. vanharteni sp. nov.

1. Vertex and frons without long erect setae. 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

- Frons, vertex and thorax (at least scutum and mesopleuron) with erect or semi-erect setae as long as or longer than diameter of hind ocellus. Outer vein of subdiscoidal cell (cu) vertical, parallel with the nervulus (cu-a) (see fig. 1) (Dentidinetus)..... 10

2 (1) Scutum more or less dull, distinctly punctured or reticulated or with dense microsculpture and fine striae in the median part (figs 9). 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) ( Dinetus s. str.).................................................................... 3

- Scutum shiny, with a network of obsolete reticulation and very scattered or reduced punctures (fig. 11). Outer vein of subdiscoidal cell (cu) oblique, converging with the nervulus (see fig. 2) (Venustidinetus).................................. 5

3 (2) Outer vein of subdiscoidal cell (cu) oblique, converging with the nervulus (see fig. 2). Last two antennomeres short and stout, about twice as long as broad. Hind femur yellow with dark brown dorsal stripe. Antennomeres 3‒9 yellow. Antennomere 3 about 3× as long as broad. Scutum finely reticulated, with fine striae on the median part (fig. 9). Propodeal enclosure dull, finely reticulated with some irregular striae, distally with some stronger transverse striae (fig. 14). Lateral part of propodeum finely reticulated with some strong striae..................................................... D. schmideggeri sp. nov.

- Outer vein of subdiscoidal cell (cu) vertical, parallel with the nervulus (cu-a) (see fig. 1). Last two antennomeres long and slender, about 4‒5× as long as broad. Hind femur black, more or less yellow distally. Upper surface of antennomeres 3‒9 black or dark brown. Antennomere 3 about 1.5‒2.0× as long as broad. Scutum with coarse puncture (fig. 10). Propodeal enclosure more strongly reticulated (see figs 17, 18). Lateral part of propodeum with fine striae.................................... 4

4 (3) Antennomere 12 more or less cylindrical, antennomeres 7‒10 hardly dilated (fig. 3). Terga IV‒V with distinct punctures. Propodeal enclosure dull; distinctly reticulated, often with oblique striae (see fig 17). Fore tarsal rake with five to seven distinctly broadened spines (see fig. 5). Europe, West Asia.............................................. D. pictus Fabricius

- Antennomere 12 broadened basally, antennomeres 7‒11 distinctly dilated (fig. 4). Terga IV‒V finely reticulated, without or with very indistinct punctures. Propodeal enclosure dull, reticulated, without or with indistinct transverse striae (see fig. 18). Fore tarsal rake with five normal spines (see fig. 6). Algeria, Tunisia....................... D. simplicipes E. Saunders

5 (2) Head and mesosoma predominantly black. Fore trochanter sometimes with small tooth basally........................ 6

- Head and mesosoma mainly reddish or pale yellow. Fore trochanter without tooth.................................. 9

6 (5) Lateral parts of propodeal dorsum with short appressed silver pubescence........................................ 7

- Lateral parts of propodeal dorsum without short appressed silver pubescence, at most with few erect silver setae.......... 8

7 (6) Fore trochanter with small tooth. Antennomeres 9‒12 without ventral indentation. Propodeal enclosure dull, distinctly granulated. Mid femur with ivory spot on the underside distally. Mid and hind tibiae yellow or ivory with dark underside. Mid and hind tarsi ferrugineous. Morocco..................................................... D. venustus de Beaumont

- Fore trochanter without tooth. Antennomeres 9‒12 with weak ventral indentation. Propodeal enclosure shiny, with irregular transverse striae. Femora, tibiae and tarsi of mid and hind legs completely black.... D. tunisiensis Khedher & Mokrousov

8 (6) Mesosternum and proximal part of mesopleuron yellow. Flagellum reddish yellow. Hind femur yellow with black stripe dorsally. Silver pubescence along inner margin of eyes narrow, reaching nearly to the height of the scape. Fore trochanter without tooth.............................................................................. D. jordanicus sp. nov.

- Whole insect predominantly black with ivory and/or light-yellow spots. Flagellum dark, antennomeres 2‒5 yellow or lightbrown dorsally. Hind femur black with yellow apex. Silver pubescence along inner margin of eyes broad, reaching nearly to the height of anterior ocellus. Fore trochanter with small tooth............................... D. porcellaneus Guichard

9 (5) Flagellum dark, brown or black. Antennomere 3 about 5× longer than broad. Lateral parts of propodeal dorsum and inner margin of eyes with short silver pubescence. On the cheeks beneath base of mandibles without erect brush of fine pale bristles. Propodeal enclosure black with broad yellow lateral parts, with distinct transverse striae (fig. 16). Mesopleuron yellow-brown with dark and ivory spot on the dorsal part............................................ D. pulawskii de Beaumont

- Antenna completely yellow-brown. Antennomere 3 about 2× as long as broad. Lateral parts of propodeal dorsum and inner margin of eyes without silver pubescence. Cheeks beneath base of mandibles with erect brush of fine pale bristles. Propodeal enclosure black, without yellow lateral parts and finely reticulated with oblique striae (see fig. 15). Mesopleuron completely yellow-brown, without ivory or dark spots........................................... D. nabataeus de Beaumont

10 (1) Frons and temple without long erect setae. Thorax laterally and ventrally pale yellow. Propodeal enclosure yellow with black border. Fore femur without tooth. Fore trochanter with broad tooth......................... D. psammophilus Kazenas

- Frons and temple with long erect setae. Thorax laterally and/or ventrally partly black. Propodeal enclosure black. Fore femur and/or fore trochanter with or without tooth............................................................... 11

11 (10) Propodeum dorsally with pale lateral parts, apically converging (sometimes reduced). Middle femur yellow. Scutellum completely or mainly yellow. Mesosoma ventrally yellow or with yellow spots, sometimes with red spots, rarely black. Propodeum dorsally around propodeal enclosure laterally almost without appressed setae..................................... 12

- Propodeum dorsally black. Middle femur black or yellow with black spot on the upper side. Scutellum yellow or black, at least apically. Mesosoma ventrally black; if with yellow spots or completely yellow, then middle femur with black spots. Scutum at least black in apical half. Propodeum dorsally around propodeal enclosure laterally with appressed silver setae.......... 13

12 (11) Fore trochanter without tooth. Mandible apically angularly protruding, medially with obtuse tooth, with notch between apex and denticle. Fore femur without tooth basally; ventrally with longitudinal impression apically limited by keel.............................................................................................. D. turanicus Kazenas

- Fore trochanter with tooth. Mandible evenly rounded. Medial lobe of clypeus evenly rounded. Fore femur with little tooth basally, ventrally without longitudinal impression......................................... D. dentipes E. Saunders

13 (11) Fore femur without tooth. Terga I‒III with broad ivory bands. Antenna yellow and light brown. Scutellum and mesosoma ventrally completely yellow, mesopleuron yellow with big black spot in upper posterior half. Arabian Peninsula.................................................................................................. D. arabicus sp. nov.

- Fore femur with tooth. Tergum I with central ivory spot, II with narrow ivory band, reduced in the middle, III without ivory spots. Antenna except scape black. Scutellum, mesopleuron and mesosoma ventrally predominantly black. Central Asia... 14

14 (13) Fore trochanter without tooth. Antennomere 3 as long as broad. Hind femur black at least basally. Fore femur with tooth in the distal half. Apical margin of clypeus with triangular teeth..................................... D. arenarius Kazenas

- Fore trochanter with tooth. Antennomere 3 broader than long. Hind femur completely reddish. Fore femur with tooth in the middle. Apical margin of clypeus with rounded teeth........................................ D. wojciechi Kazenas