Two New Species of the Braconid Genus Dinotrema Foerster (Hymenoptera, Braconidae, Alysiinae) without Prescutellar Pit

摘要

Descriptions of two new species and a key to four species of the genus Dinotrema without prescutellar pit and with a largely sculptured propodeum and elongate mandibles [D. aquilum sp. n. from the Russian Far East (Primorskii Territory), D. sochareolatum sp. n. from Krasnodar Territory (Sochi), and two Western European species. D. areolatum (Stelfox et Graham) and D. fulvicorne (Haliday)] are given. Among species of the genus Dinotrema without prescutellar pit, the species described below occupy a rather isolated position. They fit neither a large group of species having a smooth or only medially sculptured propodeum (Tobias, 2003), nor also a large group of the species characterized by a widely sculptured propodeum and short mandibles (Tobias, 2004). The species considered may be conditionally referred to the latter group, but they have rather long mandibles (their length is about 1.5 times their width) of a different shape. In addition, one of these species, D. aquilum sp. n., differs in having arelief transverse carina on the propodeum, unusually well-developed on the background of a strongly smoothened sculpture, and deep notauli extending far on the mesoscutal disc (usually, notauli in species of the genus Dinotrema are weak and present onlyon the anterior, vertical part of the mesoscutum). Another species, D. sochareolatum sp. n., differs in the presence of large tentorial areas occupying more than half of the distance from them to the mandibles. On the basis of this character, D. sochareolatum sp. n. occupies an intermediate position between the genera Dinotrema and Aspilota, whose representatives have the tentorial areas reaching the lower margin of the eye (Achterberg, 1988), and is closely related to the Western European D. areolatum (Stelfox et Graham) and D. fulvicorne (Hal.) characterized by the tentorial areas occupying half of the distance from them to the eye (Fischer, 1962). Differences between these species are given in a key below.