NOTES ON 3 LITTLE-KNOWN PALEARCTIC SPECIES OF DIGGER WASPS (HYMENOPTERA, SPHECIDAE)

New data on three species of digger wasps discovered in the central and eastern Palaearctic am present. Sceliphron (Sceliphron) caementarium (Drury, 1773) from the Black Sea coast, Ectemnius (Cameronitus) radiatus (Perez, 1905) from the Primorski Territory, and Crossocerus (Blepharipus) tyuzendzianus Tsuneki, 1954 from the European part of Russia are recorded. A key to the East-European species of the nominative subgenus Sceliphron and a table of diagnostic characters of two species of the subgenus E. (Cameronitus) found in Russia are given.