Dinetus Panzer, 1806

Mokrousov, Mikhail V. & Khedher, Hassib B., 2020, Descriptionoftwonew speciesofDinetus Panzer, 1806 (Hymenoptera: Crabronidae Dinetinae) with key to species, Zootaxa 4853 (1), pp. 117-125 : 122-123

Key to species of Dinetus Panzer

(males unknown in D. cereolus and D. rakhimovi )

1. Apex of marginal cell and second section of cubital vein of the subdiscoidal cell oblique ( Fig 12 ). Females and most males: head and mesosoma predominantly smooth and shiny, with very sparse microscopic points and setae ( Figs 8–11 ; 14–16 ). Male: flagellomere I elongate, comparable in length with the scape ( cereolus group)..................................... 2

- Apex of marginal cell truncate; second section of cubital vein of the subdiscoidal cell nearly vertical ( Figs 3 , 21 ). Head and mesosoma predominantly matte, with dense puncture and well-developed setae ( Figs 1, 2, 4, 5 , 19, 20 ). Male: basal flagellomeres short, two or three basal flagellomeres together about equal to scapal length...................................... 7

2. Propodeum postero-laterally with conspicuous, short silvery pubescence......................................... 3

- Propodeum without conspicuous silvery pubescence......................................................... 6

3. Hind ocelli almost round; ocellocular distance near 0.92 × as hind ocellar diameter at females ( Fig. 9 ) and as long as hind ocellar diameter at males ( Fig. 16 ). Mid and hind legs completely dark (except yellow apical narrow band on trochanters); metasoma black with whitish lateral spots only on tergum 2 ( Fig. 8 ). Tunisia........... D. tunisiensis Khedher et Mokrousov , sp. nov.

- Hind ocelli more or less longitudinally elongated, near oval; ocellocular distance about 0.3–0.8 × as hind ocellar minimal diameter ( Fig 17 ). Mid and hind tibiae and tarsi predominantly light, femora at least with yellow spots. Metasoma with ferruginous or yellow coloration; metasomal spots (if present) not only on tergum 2........................................... 4

4. Female: flagellomere III below dark and above yellowish, flagellomeres II+III slightly longer than scape. Male: fore trochanter with small tooth. Morocco........................................................... D. venustus de Beaumont

- Female: flagellomere III completely ferruginous or yellowish, flagellomeres II+III distinctly longer than scape. Male: fore trochanter without small tooth............................................................................ 5

5. Female: body predominantly yellow with black and ferruginous coloration, without white spots; antenna and legs (except dorsal strip on hind femur) yellow; mesonotum predominantly black. Egypt, NE India.................... D. cereolus Morice

- Female and male: body predominantly ferruginous with black and white spots; flagellomeres (except I–III) black; femora with large white spots; mesonotum predominantly ferruginous. Egypt............................ D. pulawskii de Beaumont

6. Body largely ferruginous with black large patch on mesonotum and propodeal dorsum; pronotal collar, scutellum and metanotum whitish. Female: propodeal enclosure with fine transverse or oblique striae. Male: distal flagellomeres beneath excavated, apical flagellomere keeled over and truncate; erect brush of fine pale bristles on gena beneath base of mandibles; no silver pubescence along inner margin of eye; no tooth on fore trochanter. Egypt, Jordan, Oman, UAE... D. nabataeus de Beaumont

- Body predominantly black with whitish (female) or yellow (male) pattern on pronotal collar and tubercles, patch beneath silver pubescence on mesopeuron, scutellum and metanotum. Female: propodeal enclosure shiny, with fine reticulation. Male: antennae normal, apical flagellomere about twice as long as two preceding ones; silvery pubescence along inner margins of eyes nearly reaching to mid ocellus; no erect brush of bristles beneath base of mandibles; fore trochanter with small tooth. Oman................................................................................. D. porcellaneus Guichard

7. Ocellocular distance as long as or longer than hind ocellar diameter. Head and mesosoma without long erect setae, with short semierect setae ( pictus group)........................................................................... 8

- Ocellocular distance shorter than hind ocellar diameter. Head and mesosoma (at least mesopleuron) with long erect setae ( dentipes group)......................................................................................... 9

8. Metasomal terga shagreened with clear, fine punctures. Male: flagellum articles flattened, unexpanded; fore basitarsus with six or seven expanded spines; propleuron and scutellum yellow. Europe, Russia (European part, N Caucasus, West Siberia, Altai), Turkey, Kazakhstan................................................................... D. pictus (Fabricius)

- Metasomal terga shagreened but without distinct punctures. Male: flagellomere 9 expanded medially, flagellomere X expanded basally; fore tarsomere I with five inconspicuously expanded spines; propleuron and scutellum black. Algeria............................................................................................ D. simplicipes E. Saunders

9. Propodeal enclosure almost completely without appressed silvery pubescence (pubescence developed along the lateral grooves only), with clearly visible yellow lateral stripes ( Fig. 18 ) (sometimes partially reduced) or completely yellow. Female: clypeal apex with central lobe. Male: fore femur without tooth....................................................... 10

- Only central part of propodeal enclosure without appressed silvery pubescence, completely black or with poorly visible yellow stripes or spots ( Fig. 2 ). Female: clypeus apically bidentate. Male: fore femur with ventral tooth near middle (unknown in rakhimovi ).......................................................................................... 12

10. Only ocular area of head with few short stout erect setae, erect setae on mesonotum not long. Lateral and ventral surface of mesosoma entirely yellowish; propodeal enclosure yellow. Female: anterior margin of clypeus arcuate, with two rounded teeth. Male: anterior margin of clypeus with two triangular teeth medially; flagellum columnar mostly, flagellomeres VII–X slightly deformed, apical flagellomere flattened; fore femur without tooth, fore trochanter with a broad tooth ventrally. Turkmenistan, Uzbekistan, Kazakhstan............................................................ D. psammophilus Kazenas

- Frons, vertex and mesosoma with long erect setae. Lateral surface of mesosoma partly black; propodeal enclosure black with yellow lateral stripes. Clypeus of both female and male and antennae of male different. Male: flagellomeres different; fore femora and trochanter without or with tooth............................................................... 11

11. Mid and hind legs without black spots. Female: ventral surface of mandible with pointed projection subapically, a strong tooth medially, and an obvious notch between the projection and tooth; clypeus nearly roof-like convex medially. Male: ventral surface of mandible with deep notch basally; fore trochanter without tooth; fore femur longitudinally depressed from below, limited by anterior keel. Turkmenistan, Uzbekistan, Kazakhstan................................ D. turanicus Kazenas

- Mid and hind legs with black spots. Female: ventral surface of mandible almost flat, without projections and notch; clypeus uniformly convex medially. Male: mandible without obvious notch basally; fore trochanter with tooth ventrally; fore femur normal. North Africa, Turkmenistan, Uzbekistan, Kazakhstan................................ D. dentipes E. Saunders

12. Female. Head and ventral part of mesosoma predominantly yellow; all femora yellow with darkened upper side, fore and mid femora with white spot. Clypeus with pair of long subparallel apical teeth ( Fig. 6 ). Propodeal enclosure with yellow lateral spots at base and apical spot ( Fig. 2 ). Three first metasomal terga with ivory apical bands; tergum 6 whitish (except apex). Uzbekistan....................................................... D. rakhimovi Mokrousov et Khedher , sp. nov.

- Female and male. Head and mesosoma predominantly black; fore and mid femora black, with bright spot below; hind femora black at least at base or entirely red. Clypeus with pair of short triangular or rounded apical teeth. Propodeal enclosure black. Metasoma completely ferruginous or with central subapicall spot on tergum 1, lateral spots on terga 2 and 3............. 13

13. Female: anterior margin of clypeus with two triangular teeth; scape largely black; hind femora black at least at base. Male: fore trochanter without teeth, anterior margin of clypeus with notch medially; flagellomeres I and II normal. Kazakhstan (south-east and east), China (Inner Mongolia)........................................................ D. arenarius Kazenas

- Female: anterior margin of clypeus with two rounded teeth; scape ventrally yellowish; hind femora red entirely. Male: fore trochanter with a tooth ventrally, anterior margin of clypeus with two blunt teeth; flagellomeres I and II conspicuously shortened. Kazakhstan.......................................................................... D. wojciechi Kazenas

Figures

FIGURES 8–13. Females of Dinetus tunisiensis Khedher et Mokrousov, sp. nov., holotype (8, 13) and paratype (9–12). 8, habitus in dorsolateral view. 9, head in dorsal view. 10, head in frontal view. 11, scutellum, metanotum and propodeum in dorsal view. 12, fore wing. 13, labels.

FIGURES 14–16. Male of Dinetus tunisiensis Khedher et Mokrousov, sp. nov., paratype. 14, habitus in dorsolateral view. 15, head in frontal view. 16, head in dorsal view.

FIGURES 1–7. Female of Dinetus rakhimovi Mokrousov et Khedher, sp. nov., holotype. 1, habitus in dorsolateral view. 2, scutellum, metanotum and propodeum in dorsal view. 3, fore wing. 4, head in frontal view. 5, head in dorsal view. 6, apex of clypeus. 7, labels.

FIGURES 17–21. Females of Dinetus venustus de Beaumont, 1957 (17) [IBER], Dinetus dentipes E. Saunders, 1910 (18) [MMC], male (19) and female (20, 21) of Dinetus pictus (Fabricius, 1793) [MMC]. 17, 20, head in dorsal view. 18, scutellum, metanotum and propodeum in dorsal view. 19, mesonotum, scutellum and metanotum in dorsal view. 21, fore wing.