Abstract
The structure and musculature of the male terminalia are described in three type species of the eupitheciine genera Chloroclystis Hübner, Sigilliclystis Galsworthy, and Ziridava Walker (Lepidoptera: Geometridae: Larentiinae). The following traits are characteristic for all three genera: (1) the tergal flexors of the valvae, muscles m4 running to the medial part of the transtilla or membrane anterior to the transtilla; (2) the sternal extensors of the valvae, muscles m8(3), broadly running to the inner wall of the saccus, with long lateral bundles; (3) the twisted muscles m7(6) running from the lower margin of the saccus. The peculiar structure of the transtilla is described and illustrated.
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