I saw this on Very Russian Tochka Net. He says this has been around the Russian blogosphere lately, but I hadn't yet seen it .. well, at least not before this evening. It is supposedly from a Soviet police memo identifying ethnic types. Katja very quickly assessed its accuracy for each type without a second thought.
Top: Russian, Ukrainian, Tatar, Jewish, "Tsigan" (Gypsy or Romany), Kyrghyz.
Middle: Belarusian, Lithuanian, Georgian, Armenian, Kazakh, Uzbek.
Bottom: Latvian, Estonian, Azeri, Moldovan, Turkmen.
Questions about ethnic stereotyping aside, it seems to me there are various ethnic groups missing - off the top of my head - Komi, Buryat, Chechen, and Chukchi (there are only 15,000, but they are the topic of so many jokes).