Diodontus insidiosus Spooner, 1938

Olszewski, Piotr, Ljubomirov, Toshko, Wiśniowski, Bogdan, Kowalczyk, Jan Krzysztof & Krzyżyński, Maciej, 2016, New records of the genus Diodontus Curtis, 1834 (Hymenoptera: Crabronidae) from Bulgaria, Montenegro and Poland, with a key to Central and Eastern European species, Zootaxa 4061 (2), pp. 164-172 : 165

Diodontus insidiosus Spooner, 1938

( Figs 1, 8 , 27, 29, 31 )

First record from Poland. Małopolska Upland: Pińczowskie Mts. (50°28’29”N, 20°24’1”E) 24 VII 2006— 1 ♂ leg. B. Wiśniowski.

The specimen was collected on the flower head of Senecio jacobea at the edge of xerothermic grassland. In Spain, the species was collected on flowers of Seseli tortuosum and Euphorbia serrata , also on the leaves of Populus nigra and Quercus ilex ( Gayubo & Sanza 1986) .

The species prefers open, dry and sandy habitats ( Macek et al. 2010). The species range includes mainly North and Central Europe ( Lomholdt 1984). It is known from Austria, Belgium, Bulgaria, Czech Republic, Finland, France, Germany, Great Britain, Greece, Hungary, Italy, Luxembourg, Netherlands, Portugal, Russia, Slovakia, Spain and Switzerland ( Pulawski 2015).

The species is morphologically similar to D. minutus which is one of the commonest species in Europe. Checking specimens of D. minutus in various entomological collections may reveal new records of D. insidiosus and bring new information about the occurrence of the species in the region.

Figures

FIGURES 1 – 9. Diodontus spp. 1. D. insidiosus ♀, clypeus and mandibles, frontal view. 2. D. minutus ♀, habitus, lateral view. 3. D. tristis ♀, clypeus and mandibles, frontal view. 4. D. tristis ♀, habitus, lateral view. 5. D. minutus ♀, clypeus and mandibles, frontal view. 6. D. minutus ♀, first antennomeres. 7. D. major ♀ (by Dollfuss 1991), first antennomeres. 8. D. insidiosus ♀, external teeth of clypeus. 9. D. minutus ♀, external teeth of clypeus.

FIGURES 26 – 31. Diodontus spp. 26. D. minutus ♂, anterior metatarsus. 27. D. insidiosus ♂, anterior metatarsus. 28. D. minutus ♂, metatarsus of the mid leg. 29. D. insidiosus ♂, metatarsus of the mid leg. 30. D. minutus ♂, right antenna, ventral view. 31. D. insidiosus ♂, right antenna, ventral view.