A recent encounter with Omiodes monogona Meyrick, 1888 (Crambidae: Spilomelinae) - an interesting snout moth endemic to Hawaii Author Yepishin, Viktor Institute for Evolutionary Ecology of the National Academy of Sciences of Ukraine, 37, Academician Lebediev St., 03143, Kyiv, Ukraine Author Govorun, Oleksandr Sumy State Pedagogical University named after A. S. Makarenko, 87, Romenska St., 40002, Sumy, Ukraine text Zootaxa 2024 2024-02-05 5406 2 397 400 http://dx.doi.org/10.11646/zootaxa.5406.2.12 journal article 10.11646/zootaxa.5406.2.12 1175-5326 10618132 The original description of Omiodes monogona Meyrick, 1888 was based on one female from Hawaii without specifying the exact island where it was collected. Zimmerman (1958: 108–109) discussed its biology, parasitoids, and included descriptions of preimaginal stages and figures of genitalia of both sexes. Material examined : 15♂ , 7♀ USA , The Hawaii archipelago, Maui Island , Kula village , 20.7353N 156.3323W , 950 m , at light, 12.xii.2015 – ii.2016 , leg. O. Govorun ; prep. no. ♂ 746.23s, ♂ 757.23s, ♂ 758.23g , ♀ 747.23g , ♀ 748.23s, ♀ 749.23g , ♀ 750.23g V. Yepishin , deposited in the Institute for Evolutionary Ecology (Kyiv) and the private collection of the first author. Adults were collected near artificial light sources from mid-December to February in the southern vicinity of Kula village ( Figs 4–5 ). Nearby, we observed the possible food plant of the caterpillars, Erythrina sandwicensis O.Deg. ( Fabaceae ) cited by Zimmerman (1958: 108 (as E. monosperma Gaudich. )) as the principal and native hostplant. Adult ( Figs 1, 2 ): wingspan 23–26mm , sexual dimorphism is not expressed, the female antenna is slightly thinner than in the male, other head structures are the same in both sexes ( Figs 3a, b ). Male genitalia ( Figs 6a–e, 7 ): uncus very long, thin, uncus base subtrapezoidal, expanded at apex, densely covered with short setae; tegumen about 1.7× shorter than uncus; valva large, blade-like expanded, rounded protrusion on costal edge, base of costa slightly sclerotized, cucullus not sclerotized; almost in middle of valva a transverse sclerotized lintel bears triangular-shaped fibula with an apical tooth adjacent to sacculus and directed towards valva; coremata or “hair tuft” very wide, not longer than the valva (not figured); sacculus 2× shorter than valva, sclerotized; juxta flat oblong with constriction in middle, slightly bifurcated distally; vinculum subtriangular; phallus cylindrical, fusiform, oblong 1.2× shorter than valva with one thin, long cornutus 1.6× shorter than phallus. Female genitalia ( Fig. 8 ): papillae anales narrow, subrectangular, covered with short setae; posterior and anterior apophyses almost straight, slightly curved at base; anterior apophyses 2× longer than posterior ones; segment VIII same length as posterior apophyses, posterior margin equal, anterior margin of sternum VIII with wide V-shaped emargination; antrum not pronounced, cylindrical slightly expanded; colliculum cylindrical strongly sclerotized; ductus seminalis thin, departing near colliculum; ductus bursae long, thin, about 3× longer than corpus bursae, signa absent. Distribution : endemic to Hawaii ; Hawaii , Maui, Oahu, Kauai, Molokai and Lanai Islands ( Zimmerman 1958 ; iNaturalist 2024).