Very similar to the Common Tree Frog (Hyla arborea), but differs from it by usually having a dark spot on the upper lip below the eye, lack of an inguinal loop, and slightly shorter hind legs (when the hind leg is stretched along the body, the tibio-tarsal articulation commonly reaches the posterior edge of the eye). Tympanic membrane smaller than eye. Dorsal skin smooth, ventral skin granular. Coloration and sexual dimorphism are similar to those in the Common Tree Frog (the main difference is the absence of the inguinal loop). Dark lateral band regularly disrupted into spots and partially reduced. The tips of fingers and toes have round adhesive discs. The forelimb webbing is poorly developed. The mean snout-vent length for males is 31 mm (range 26-45 mm) and for females is 35 mm (range 26-41 mm). The nuptial pads in males are yellow.
Karotype: Diploid chromosome (2n) with 6 large pairs and 6 small ones making a total of 24 chromosomes.
- Bannikov, A. G., Darevsky, I. S. and Rustamov, A. K. (1971). Zemnovodnye i Presmykayushchienya SSSR [Amphibians and Reptiles of the USSR]. Izdatelistvo Misl, Moscow.
- Bannikov, A. G., Darevsky, I. S., Ishchenko, V. G., Rustamov, A. K., and Szczerbak, N. N. (1977). Opredelitel Zemnovodnykh i Presmykayushchikhsya Fauny SSSR [Guide to Amphibians and Reptiles of the USSR Fauna]. Prosveshchenie, Moscow.
- Fei, L. (1999). Atlas of Amphibians of China. Henan Publishing House of Science and Technology, Zhengzhou.
- Kuzmin, S. L. (1995). Die Amphibien Russlands und angrenzender Gebiete. Westarp Wissenschaften, Magdeburg.
- Kuzmin, S. L. (1999). The Amphibians of the Former Soviet Union. Pensoft, Sofia-Moscow.
- Maeda, N. and Matsui, M. (1990). Frogs and Toads of Japan, 2nd edition. Bun-Ichi Sogo Shuppan Co., Ltd., Tokyo, Japan.
- Nikolsky, A. M (1936). Fauna of Russia and Adjacent Countries: Amphibians (English translation of Nikolsky, 1918, Faune de la Russie et des Pays limitrophes. Amphibiens. AcadÃ©mie Russe des Sciences, Petrograd, USSR). Israel Program for Scientific Translations, Jerusalem.
- Stejneger, L. H. (1907). Herpetology of Japan and Adjacent Territory, United States National Museum Bulletin 58. Smithsonian Institution, Washington, D. C..
- Terent'ev, P. V. and Chernov, S. A (1965). Key to Amphibians and Reptiles [of the USSR]. Israel Program for Scientific Translations, Jerusalem.
- Vorobyeva, E. I. and Darevsky, I. S. (eds.) (1988). Amphibians and Reptiles of Mongolian People's Republic: General Problems. Amphibians.. Moscow.
- Won, H.-K. (1971). Choson Ryangso Pyachyungryuchji [Amphibian and Reptilian Fauna of Korea]. Korean Academy of Sciences, Pyongyang.
- Ye, C., Fei, L., and Hu, S. Q. (1993). Rare and Economic Amphibians of China. Sichuan Publishing House of Science and Technology, Chengdu.
- Zhao, E. and Adler, K. (1993). Herpetology of China. Society for the Study of Amphibians and Reptiles, Oxford, Ohio.
- Zhao, E. and Zhao, H. (1994). Chinese Herpetological Literature: Catalogue and Indices. Chengdu University of Science and Technology, Chengdu.