''Holcocerus rjabovi'' is a

moth Moths are a paraphyletic group of insects that includes all members of the order Lepidoptera that are not butterflies, with moths making up the vast majority of the order. There are thought to be approximately 160,000 species of moth, many of w ...

in the family Cossidae. It is found in

Armenia Armenia (), , group=pron officially the Republic of Armenia,, is a landlocked country in the Armenian Highlands of Western Asia.The UNbr>classification of world regions places Armenia in Western Asia; the CIA World Factbook , , and ''Ox ...

and

Azerbaijan Azerbaijan (, ; az, Azərbaycan ), officially the Republic of Azerbaijan, , also sometimes officially called the Azerbaijan Republic is a transcontinental country located at the boundary of Eastern Europe and Western Asia. It is a part of th ...

. The length of the forewings is 17–20 mm.Ревизия древоточцев рода Holcocerus Staudinger, 1884 (s. l.)
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References

Natural History Museum Lepidoptera generic names catalog
Cossinae Moths described in 2006 Moths of Asia Moths of Europe {{Cossinae-stub