Vol 99, No 9 (2019)

Relations between the predatory species were studied in the tritrophic system “plant—spider mite Tetranychus urticae—predatory mite Phytoseiulus persimilis + predatory gall midge Feltiella luboviae” on Ginga F1 and Muromsky 36 cucumber cultivars, differing in their resistance to the phytophage. It was shown that the formation and functioning of the consortium were largely influenced by the resistance properties of the cucumber cultivars and the bioecological features of the consorts. The acariphages most effectively suppressed the pest at the initial stage of consortium formation, when their first generation was active. The efficiency of the predatory midge F. luboviae on the susceptible cucumber cultivar was lower in the presence of the predatory mite Ph. persimilis. The resistant cultivar not only compensated for the negative effect of one predator (Ph. persimilis) on the oviposition behavior of the other predator (F. luboviae), but also increased the efficiency of combined use of the acariphages as compared to their separate application.

Analysis of the latitudinal component of the Dolichopodidae distributions revealed the prevalence of the temperate group in the Yakutian fauna (74 species, or 51%). Analysis of their ranges classified according to the longitudinal extension showed the prevalence of widespread species (89, or 61.4%), in particular those with Holarctic ranges (28 species, or 19.3%). The Yakutian dolichopodid fauna is mainly derived from the Holarctic, Trans-Eurasian, Euro-Siberian, and Far Eastern faunas with inclusion of some Euro-Siberian-Central Palaearctic species. There is also a considerable fraction of East Siberian species.

A new species of the genus Macrophyllodromia, M. obscura sp. n., is described from Peru. An emended diagnosis of the genus Macrophyllodromia is given based on the characters of the hypandrium and male genitalia. The taxonomy of the family Ectobiidae and the place of Macrophyllodromia in it are briefly analyzed.

The following new synonymies are established: Euroxenus Gnezdilov, 2009 = Duplexissus Wang, Zhang et Bourgoin, 2019, syn. n.; Nikomiklukha Gnezdilov, 2010 = Sarimissus Wang, Zhang et Bourgoin, 2019, syn. n. Consequently, two new combinations are formed: Euroxenus punctatulus (Wang, Zhang et Bourgoin, 2019), comb. n., and Nikomiklukha maculifrons (Wang, Zhang et Bourgoin, 2019), comb. n. Thus the genus Euroxenus Gnezdilov is recorded for the first time from the Oriental Region, and the genus Nikomiklukha Gnezdilov, from Hainan Island.

Deporaus (Roelofsideporaus) terminassianaesp. n. from Central China is described and illustrated. It is similar to Deporaus (Roelofsideporaus) affectatus Faust, 1887 but differs in a thickened fore femur, wider pronotum and elytra, a shorter rostrum, in the non-mucronate fore tibia, and in the shape of the sclerites of the endophallus.

Three new fossil species of the subfamily Pherhombinae (Hymenoptera, Ichneumonidae) are described from Primorskoe deposit of Eocene Baltic amber (Kaliningrad Province, Russian Federation): Pherhombus kasparyanisp. n., Ph. kraxtepellensissp. n., and Ph. sorgenauensissp. n. An annotated list and a key to the six known species of Pherhombinae are given. The color preservation of ichneumonid inclusions in Baltic amber is discussed, the presence of syninclusions is interpreted, and reconstruction of the species biology is attempted.

Two species of predatory gall midges of the genus Feltiella develop in the colonies of the spider mite Tetranychus urticae Koch (Acarina, Trombidiformes: Tetranychidae) in the vicinity of St. Petersburg. A new species Feltiella luboviaesp. n. is described, and the diagnoses of the genus Feltiella and the widespread species F. acarisuga (Vallot), which was found in the northwest of Russia for the first time, are supplemented. Feltiella luboviae sp. n. differs from the closely related F. acarisuga and F. acarivora (Zehntner) in a number of morphological, morphometric, biological, and molecular genetic characteristics. The male genitalia of F. luboviae sp. n. have the following characters: basal protrusions angular, bare, aedeagus narrow, hypoproct swollen laterally, cerci cordiform, flagellomeres with pyriform distal node and whorls of long circumfilar sensorial loops, 2nd segment of hind tarsus 6.0–8.2 times as long as 1st and much longer than 3rd–5th tarsomeres combined. The embryonic development of F. luboviae sp. n. lasts 3.9 ± 0.12 days, the larval development lasts 9.3 ± 0.11 days, the pupal development lasts 5.9 ± 0.14 days, and the adult life span is 3.6 ± 0.13 days. The larvae and pupae of F. luboviae sp. n. develop faster than those of F. acarisuga. The COI nucleotide sequence of F. luboviae sp. n. had a 89% match with that of F. acarisuga and a 91% match with that of F. acarivora. The diagnosis of the genus Feltiella is supplemented by morphometric indices. Data on the rearing conditions for the laboratory population of F. luboviae sp. n. and evaluation of its effectiveness in protected ground as compared to F. acarisuga are given.

The elm flea-weevil Orchestes steppensis Korotyaev, 2016 was found in the eastern part of Yaroslavl Province; previously the species was known within European Russia as far north as the southeastern boundary of Voronezh Province and the city of Ulyanovsk in the Volga River basin.