S. Mahunka szerk.: Folia Entomologica Hungarica 55. (Budapest, 1994)

Holotype (male): [Bulgaria], Rhilo-Dagh, coll. Reitter (a paralectotype of Homaloplia iris Reitter, 1887). Paratypes (16 specimens, males and females): Bulgária, Vitosa, 1600 m, 1954. VII. 8-24., leg. Szatala Ö.; Kalinin, Rhilo, Bulgar., [leg.] Breit, coll. Reitter (a paralectotype of Homaloplia iris Reitter, 1887); Pirin Mount, 24. 7. 1965., Vihren, 2200 m, Bulgaria, leg. Tóth L.; Rila Mount, 21. 7. 1965., Bulgaria, leg. Tóth L.; Rila Mount, 21. 7. 1965., Mallowitza, 2-2600 m, Bulgaria, leg. Tóth L. The types are deposited in the Department of Zoology of the Hungarian Natural History Museum, Budapest. In external features Omaloplia balcanica differs from O. iris by punctuation of the head. As a rule this is less coarse in O. balcanica, the punctures are shallower, somewhat obsolete. In O. iris the punctuation is very coarse, the punctures are deeper. This species was described under the name '''Homaloplia marginala" in Baraud's monograph (1965b). Baraud designated a neotype for Scarabaeus marginatus Fuesslin, 1775 but the neotype and the species described by Fuesslin are not the same. Even leaving this fact out of consideration, there is no way to apply this name because of its junior primary homonymy. I have designated the lectotype of Homaloplia iris Reitter, 1887, to fix its status presently accepted and to prevent further confusions, because the type-specimens (all of them are syntypes originally) represent more than one species. Lectotype (male): RhiloDagh, coll. Reitter, Iris m. Paralectotypes (males): Rhilo-Dagh, coll. Reitter; Rhilo-Dagh, coll. Reitter (a paratype of Omaloplia balcanica sp. n.); Kalinin, Rhilo, Bulgar., [leg.] Breit, coll. Reitter (a paratype of Omaloplia balcanica sp. n.); Thessalia, coll. Reitter [a specimen of Omaloplia caeca (Baraud, 1965)]. The types are deposited in the Department of Zoology of the Hungarian Natural History Museum, Budapest. Omaloplia lonae (Schatzmayr, 1923) In general appearance extremely similar to Omaloplia nigromarginata (Herbst, 1785). Body oval, convex, moderately broadening posteriorly; surface very finely microreticulated, barely nacreous, preferably greasily shining; pitch-black in colour, elytra transparently pale yellow - elytral margins (epipleuron, 10th and 1st intervals as well as basal and apical margin) slightly fuliginous - or entirely fuliginous, antennae, palpi and tarsi reddish brown. Dorsal and ventral surface with sparse pubescence, pronotal and elytral margins fringed with long bristles. Surface of head coarsely, somewhat irregularly punctuated, with shallow setiferous punctures and pale setae. Clypeus transverse quadrangular, narrowing anteriorly, with upturned margins; anterior clypeal margin almost rectilinear; anterior angles broadly rounded. Pronotum convex, transverse quadrangular, arcuately narrowing anteriorly; surface strongly, somewhat irregularly punctuated, with setiferous punctures and pale setae; margins finely bordered; posterior angles obtusely rounded. Elytra convex, moderately broadening posteriorly, truncated apically. Humeral callus weakly prominent, preapical callus indistinct. Lateral margin (in lateral view) distinctly sinuate. Epipleural ridge present, reaching outer apical angle. Intervals weakly convex (odd intervals a little more raised, therefore, apparently narrower than even ones);