Acasis appensata (Eversmann, 1842) (Lepidoptera, Geometridae) is reported in Serbia for the first time. The status on the Balkan Peninsula of the two Western Palaearctic species of Acasis Duponchel, 1845 is discussed. The localized distribution pattern of both A. appensata and A. viretata (Hübner, 1799) is probably genuine, though both species may be significantly under-recorded for want of adequate field workers in the region., {"references":["Abafy-Aigner, L., Pavel. J., & Uhryk, F. 1896: Fauna Regni Hungariae, Lepidoptera. Regia Societas Scientarum Naturalium Hungarica, 1-82. Bergmann, A. 1955. Die Grossschmetterlinge Miteldeutschlands. Band 5 (1/2), Spanner. Urania-Verlag, Leipzig, 1267pp. Beshkov, S. 2011. Biodiversity of butterflies and moths (Insecta: Lepidoptera: Macrolepidoptera) in chestnut forests, Belassitsa Mountain (Preliminary report). In Zlatanov, T., Velichkov, I., Nikolov, B. (Eds.) State and prospects of the Castanea sativa population in Belasitsa mountain: climate change adaptation; maintenance of biodiversity and sustainable ecosystem management. Project BG 0031 EEA report. Buresch, I. 1914. In Referate u. Mitteilungen. Annuaire de la Section entomologique de la Société bulgare des sciences naturelles. 1912. Travaux de la Société Bulgare des Sciences Naturelles, 6, 122-127. Căpușe, I., & Kovács, A. 1987. Catalogul collecţiei de lepidoptere \"László Diószhegy\" de la Muzeul Judeţean Covasna, Sfântu Gheorghe, Institutul de Speleologi \"Emil Rakoviţa\", Bucaresti. Dodok, I. 2006. The fauna of Geometridae (Lepidoptera) in the region of Užice in Western Serbia. Acta entomologica serbica, 11(1/2), 61-75. Đurić M., Hric, B. 2015: Unapređeni uvid u noćne leptire Ovčarsko-Kablarske klisure [The improved insight into moths of the Ovčar-Kablar Gorge]. Beležnik Ovčarsko-kablarske klisure, 6(1), 59-67. [in Serbian, English summary]. Ganev, J. 1983a. New and Rare Butterflies (Macrolepidoptera) to the Bulgarian Fauna. Acta Zoologica Bulgarica, 21, 89-94. Ganev, J., 1983b. Systematic and synonymic list of Bulgarian Geometridae. Phegea, 11(2), 31-42. Hausmann, A., & Viidalepp, J. 2012. Geometrid Moths of Europe, volume 3, Subfamily Larentiinae 1. Apollo Books, Vester Skerninge, Denmark). Kranjčev, R., 1985. Odnos faune makrolepidoptera prema prirodnim i antropogenim staništima Podravine i podravskih pijesaka I. Podravski zbornik, 11, 200-226. Mann, J. 1857. Verzeichnis der im Jahre 1853 in der Gegend von Fiume gesammelten Schmetterlinge. Wiener entomologische Monatschrift, 1(6), 139-189. Nestorova, E. 1998. Catalogus Faune Bulgaricae 2. Lepidoptera, Geometridae. Pensoft, 193 pp. Osthelder, L., 1925-1932. Die Schmetterlinge Südbayerns und der angrenzenden nördlichen Kalkalpen, Beilage zur 15 – 22 Mitteilungen der Münchner Entomologischen Gesellschaft, 598 pp. Sarić, M. (Ed.) 1992. The Flora of Serbia, vol 1, 1-429. Serbian Academy of the Sciences and the Arts. Belgrade, 429 pp. Slivov, A., & Lukov, H. 1976 [1977]. Beitrag zur Erforschung der Schmetterlinge in Bulgarien. Terrestrial Fauna of Bulgaria, Materials. Sofia, Bulgarian Academy of Sciences, 234-242. Stauder, H. 1919/20-1929. Die Schmetterlingsfauna der illyro-adriatischen Festland- und Inselzone (Faunula Illyro Adriatica). Zeitschrift für wissenschaftliche Insektenbiologie 15(10-12), 201–220; 16(1/2), 16-23, (3/4), 43-49, (5/6), 101-108, (7/8), 143-153, (9/10), 166-176, (11/12), 219-224; 17(1/2), 14-21, (3/4), 58-64, (5/6), 83-92, (7/8), 135-147, (9/12), 165-176; 18(1/2), 10-18, (3/4), 58-68, (5/7), 106-114, (8/9), 187-202, (10/11), 253-267, (12), 317-327; 20(8), 191-226; 21(8/9), 179-190, (10), 223-238; 22(1/2), 30-45, (3/4), 74-92. Entomologischer Anzeiger Wien, 9, 39-41, 53-58, 65-72, 88-94, 115-117, 131-137, 157-158, 177-178, 194-199, 213-218, 233-236, 251-252, 272-273, 292-293, 299-306, 318-325, 359-364, 379-384, 397-403, 420-423, 437-442; 10, 9-11, 36-37, 52-57 75-77, 105-108, 133-136, 153-155, 201-204, 249-252, 275-276, 294-297, 309-310, 351-352, 374-377, 436-437; 12, 35-39, 53-54, 71-72, 92, 131-132, 150-152, 200, 233-234, 256; 13, 18-20. Stojanović, D., Ćurčić, S., & Brajković, M. 2010. The Geometrid moths (Lepidoptera, Geometridae) of the Mt. Fruška Gora (Northern Serbia). Institute of Zoology, Monographs Vol. XIV, Belgrade-Novi Sad-Podgorica, 325pp. Szekely, L. 2010. Moths of Romania 3: Geometridae 2, Larentiinae 1. Sâcele, Brąsov, 112 pp. Tomić, D, Zečević, M., Mihajlović, LJ., & Glavendekić, M. 2002. Fauna of the Geometrid moths (Lepidoptera: Geometridae) of Serbia. In Petrović, Z. (Ed.) Proceedings on the Fauna of Serbia, volume 6. Serbian Academy of Sciences and Arts, 94 pp."]}