Dinetus (Dentidinetus) vanharteni, 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 : 88-89

Dinetus (Dentidinetus) vanharteni sp. nov.

( Figs 53, 54, 56 )

Diagnosis. A member of the D. dentipes species group. D. vanharteni is characterized by the presence of long erect setae on scutum and mesopleuron, the absence of long setae on the head; the predominantly yellow mesosoma with black scutum and black dorsal area of propodeum; the mesosoma (except propodeal enclosure) densely covered with appressed silver pubescence often masking sculpture, the vertical outer margin of subcubital cell (cu) parallel with the nervulus (cu-a) and the light brown metasoma with broad ivory bands on terga. From D. psammophilus it differs by the predominantly black propodeal enclosure and the light brown tergum I with ivory lateral spots (pale yellow in D. psammophilus ).

Description female. Dorsal and lateral view: figs 53, 54.

Colour. Body light yellow with black and orange markings. Head light yellow, vertex black in the hind ocelli area. Mandible yellow with black apex. Scape yellow with black spot dorsally, antennomeres 2‒4 yellow with black underside, remaining antennomeres brown. Mesosoma light yellow, scutum completely black. Propodeum light yellow, dorsal part including propodeal enclosure black, rear side with black spots. Metasoma: Terga I‒V light brown, I‒III and V with broad ivory bands posterior, IV with small ivory spots on the hind margin, VI ivory with red apex. Sterna I‒IV ivory, V‒VI ivory and light brown. Legs light yellow, middle and hind trochanters with black spot, all femora with dark stripe dorsally, hind tibia with dark stripe ventrally.

Morphology. Head, vertex, mesopleuron and lateral parts of propodeum with fine indistinct microsculpture, hardly shiny. Anterior margin of clypeus with two small teeth. Scutum covered with dense appressed silver pubescence obscuring the sculpture. Head and mesosoma (except propodeal enclosure) with more or less dense appressed silver pubescence. Scutum and scutellum with scattered erect setae, on scutum longer than diameter of front ocellus. Terga I‒V with narrow bands of white setae apically. Propodeal enclosure dull, finely reticulated. Apical antennomere slightly curved, antennomere 3 about 3× as long as broad. Mandible with conspicuous tooth on the outside. Spines of the fore tarsal rake about twice as long as the next tarsomere. Fore femur with long bristles ventrally. Wing veins light brown and yellow. Outer vein of subdiscoidal cell (cu) vertical, parallel with the nervulus (cu-a) (see fig. 1). Body length 4.5 mm.

Male unknown.

Holotype ♀. United Arab Emirates, Barg al-Saqoor, 24,018N 52,592E, lg Harten, 29.10.2018, uae66 ( ZSM, temporary in coll. CSE). (Labels see fig. 56). The holotype is really collected by van Harten and A. Saji (Schmid-Egger, personal communication), but the label bears only the name of the former.

Remark. Maybe D. vanharteni is only a colour form of D. psammophilus . However, because of the different distribution area of the latter (Central Asia), separated by a large distance, and the different characters, the description of the species from the UAE as distinct seems the best solution. Males are still needed to confirm the species status.

Figures

FIGURES 51–56. View dorsal and lateral: 51–52 D. porcellaneus ♂, 53–54 D. vanharteni ♀ holotype, 55 D. pulawskii ♂., 56 holotype labels (phot. Jacobs) (scale bar 1 mm)