In 2001 A. crenata was discovered in a small area in NE Lithuania (R. BERNARD, 2002, Opusc. zool. flumin. 202: 1-21). In order to solve the puzzle of its range in this part of Europe, intensive searches were carried out in July 2002 in SE Estonia, SE Latvia and NE Lithuania (northward of the known localities). Only I locality of A. crenata was found, in the Rezekne district in Latvia; 2 small forest lakes (A, B), 400 m distant, 4.8-5.1 km NW of Andrupene, 2.15-2.65 km W of western shores of S part of Viraudas Lake, 56°13’10” N, 27°20’25- -50” E (Fig. 1). (A) 140x80 m; surrounded by pine forest (with addition of spruce and birch); the water table bounded by narrow Sphagnum mats (0.5-3 m broad, only locally up to 5-7 m) with: Carex limosa, C. rostrata, C. nigra, C. elata, Scheuchzeria palustris, Menyanthes trifoliata, Calla palustris, Eriophorum angustifolium, E. vaginatum, Potentilla palustris, Oxycoccus palustris; along one shore Sphagnum mats form peninsulas and bays, with Carex elata at the edge of mats and in shallow water next to them (accompanied there locally by Calla palustris); rare Nymphaea sp.; water clear with the transparency minimum 2 m (measured with the use of Secchi disc). 9 July. A. crenata 11 exuviae (3 S, 8 $). — Other aeshnids: imagines: rare Aeshna grandis (L.); – exuviae: A. juncea (L.) 31, A. subarctica elisabethae Djak. 3, A. cyanea (O.F. Mull.) 4, A. grandis 4. – Other species: Lestes sponsa (Hans.), Coenagrion puella (L.), C. hastulatum (Charp.), Enallagma cyathigerum (Charp.), Cordulia aenea (L.), Libellula quadrimaculata L., Leucorrhinia dubia (Vander L.).