In this study, the egg structure of Poecilimon cervus Karabag, a species of Tettigoniidae (Orthoptera: Tettigoniidae) was examined using the scanning electron microscope (SEM) and the transmission electron microscope (TEM). P. cervus individuals were collected from oak forests in Kargasekmez, Kizilcahamam, Ankara in 2009 and eggs were dissected. The eggs of P. cervus are about 3,4 x 1,3 mm in size, bilateral symmetrical and elongated ovoid in shape. There are some clear chorionic polygonal patterns in patches on the egg. At the micropylar area near the posterior pole, there are 9-18 micropyle openings. A rib recumbent from anterior pole to posterior pole surrounds the whole egg except micropylar area. The egg shell is composed of clear exochorion and endochorion layers from outermost to innermost. Exochorion has many chorionic columns and air chambers. In columns there are fine canals that ensure connection between exochorion and endochorion. Endochorion is more compact layer that has numerous por canals. The underside of endochorion has a single row fine layer.