New Afrotropical Opisthoheza siniaevi and Sonithometa maurice (Lepidoptera, Lasiocampidae, Lasiocampinae, Gastropachini)

One new species of the genus Opisthoheza Zolotuhin & Prozorov, 2010, Opisthoheza siniaevi sp. n. from the Republic of Congo, is described together with closely related Sonithometa maurice gen & sp. n. from Guinea. The new species are compared with Opisthoheza heza Zolotuhin & Prozorov, 2010 and Nirbiana obscura (Hering, 1941). Male adults and genitalia are illustrated.