New data on the distribution of Cossidae ( Lepidoptera ) in Mongolia

We recorded a new species of Cossidae – Acossus terebrus (Denis & Schiffermüller, 1776) – for Mongolia (Tov Aimak). We also report on the most northern habitat of the cossid genus Gobibatyr Yakovlev, 2004 (North-West Mongolia, Bayan-Ulegej Aimak), which shows the permeability of the Mongolian Altai Mountain Range for some elements of the Dzungarian fauna. Additionally, our sampling resulted in adding new localities to the ranges of Catopta perunovi Yakovlev, 2007 and Cecryphallus nubila (Staudinger, 1895) (first discovered in Hovd Aimak).


Introduction
The Carpenter-Moths (Lepidoptera, Cossidae) in Mongolia are relatively well known compared to their fauna in most other countries.Several articles (Daniel 1965(Daniel , 1969(Daniel , 1970(Daniel , 1973;;Yakovlev 2004Yakovlev , 2015a) ) treating the systematics and distribution of Mongolian Cossidae were published.It was established that the Cossidae fauna of Mongolia is distinct (Yakovlev and Dubatolov 2013;Yakovlev 2015b).In total, 23 species were reliably recorded; in addition, two species, Acossus viktor (Yakovlev, 2004) and Cossus shmakovi Yakovlev, 2004, were recorded from the border regions of Russia (the Republic of Tuva, the Tes-Khem River valley), so they are likely present in Mongolia as well.

Material and methods
The adult Cossidae were collected using the combined light lamp Phillips−250 W mounted above a fabric screen, battery light traps with the lamp Philips TL 8W/05 and chloroform as the killing agent.

New species for Mongolian fauna
Acossus terebrus (Denis & Schiffermüller, 1776) (Figs 1A, 2) -widely distributed transpalaearctic species (Daniel 1956;Yakovlev 2007Yakovlev , 2011a)), rather rare in most of the localities, for the first time reliably recorded in the Mongolian fauna.This discovery was expected as A. terebrus is reliably known from the neighboring regions of Russia (the Republic of Altai, Tuva, Buryatia, Irkutsk and Chita regions) and China (Inner Mongolia Province) (Hua et al. 1990).
Remarks.The Mongolian Altai is a significant frontier in the distribution of insects.This conclusion is based on the distribution of Orthoptera (Sergeev 1986), Coleoptera (Kryzhanovskij 2002), Papilionoidea (Yakovlev 2011), and Cossidae (Yakovlev 2015b).The discovery of G. ustyuzhanini significantly extends the range of the genus Gobibatyr.All the previously known discoveries of G. ustyuzhanini were located on the south (Dzhungarian) macroslope of the Mongolian Altai, in Dzungarian and Zaaltayskaya Gobi on the territory of Hovd, Gobi-Altai and South Gobi Aimaks of Mongolia (Hovd Aimak, Janatin Dolon, 40 km N Somon Manchan, SW bank of Khar-Us nuur Lake; Hovd Aimak, Bodonchijn-Gol basin, Hundijn-Gol River valley; Hovd Aimak, 10  Somon, Talyn Bulay) (Yakovlev 2015a).It was previously believed that the Mongolian Altai is a barrier to the dispersal of G. ustyuzhanini to the north, preventing its penetration to the Great Lakes Valley (Yakovlev and Dubatolov 2013;Yakovlev 2015b).Yakovlev, 2007 (Fig. 2) The species was described from the material from Russia, Altai Rep., Ongudai.It was recorded in several localities of northwestern Mongolia on the territory of Chovsgol and Bayan-Ulegei Aimaks (Yakovlev 2015a), first reliably recorded in Hovd Aimak.Cecryphallus nubila (Staudinger, 1895) (Fig. 2)

Conclusion
At present 24 Cossidae species from 13 genera have been reliably recorded in Mongolia.The distribution of the genus Gobibatyr Yakovlev, 2004 has been significantly extended (the northern border of the habitat has been shifted by 450 kilometers).Despite numerous past efforts focused on the study of the Mongolian Cossidae, it appears that much can still be discovered, especially in the southeast of the country, from where little material is known.