Dryinus, Latreille, 1804

Olmi, Massimo, Capradossi, Leonardo & Guglielmino, Adalgisa, 2021, Discovery of a new species of Dryinidae (Hymenoptera: Chrysidoidea) from the Republic of the Congo, Israel Journal of Entomology (Oxford, England) 51, pp. 35-41 : 39

Dryinus

females were divided for the sake of convenience by Olmi (1993) and Olmi et al. (2019) into four groups based on the following characters:

Group 1: enlarged claw not reduced, much longer than arolium, with one subapical tooth, never with one broad apical lamella; notauli at least partly present.

Group 2: enlarged claw not reduced, much longer than arolium, with one subapical tooth, never with one broad apical lamella; notauli absent.

Group 3: enlarged claw not reduced, much longer than arolium, without subapical tooth or with at least two subapical teeth; rarely with only one subapical tooth, then with one very broad apical lamella.

Group 4: enlarged claw greatly reduced, approximately as long as or slightly longer than arolium.

Based on its diagnosis, Dryinus lesianus n. sp. belongs to Group 1 of Dryinus and is close to D. inexpectatus Guglielmino &Olmi, 2014 , described from Madagascar. Following its description, the key to the females of the Afrotropical species of Group 1, published by Olmi et al. (2019), should be modified by replacing couplet 44 as follows:

44 Occipital carina incomplete ( Figs 1, 6); protarsomere 5 with very long apex ( Figs 8, 9) ( Olmi et al. 2019: fig. 133B)....................................................... 44'

– Occipital carina complete; protarsomere 5 with shorter apex ( Olmi et al. 2019: fig. 125C).......................................................................................................45

44' Mesoscutum completely weakly granulated ( Fig. 7); protarsomere 5 with very long apex ( Fig. 8)................................... D. inexpectatus Guglielmino & Olmi

– Mesoscutum with lateral regions sculptured by many irregular longitudinal keels and median region punctate, unsculptured among punctures ( Fig. 1); protarsomere 5 with less long apex ( Fig. 9)........................... D. lesianus n. sp.

In the Afrotropical Region, there are only first three groups of Dryinus present; group 4 is absent being limited to the Nearctic and Neotropical regions. Group 1 has included 39 species ( Olmi et al. 2019) and is the most diverse (groups 2 and 3 include in fact only 4 and 14 species, respectively). Following the description of D. lesianus n. sp., group 1 grows now to 40 species. Most of them are broadly distributed in the Afrotropical Region. On the other hand, endemism is very rare in the Dryinidae ( Olmi et al. 2019) . For this reason, we presume that D. lesianus n. sp. is not endemic to the Republic of the Congo, but should have a broader distribution, including at least the neighbouring countries. The knowledge of the hosts should be useful to understand the possible distribution range of the new species, but unfortunately they are unknown. The situation is not unique, as in group 1 the hosts of only five species out of 40 are known in the Afrotropical Region ( Guglielmino et al. 2013; Olmi et al. 2019). These hosts belong to the Dictyopharidae , Flatidae , Lophopidae , Ricaniidae and Tropiduchidae ( Hemiptera : Fulgoromorpha) ( Guglielmino et al. 2013).