Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 98. (Budapest 2006)

Bálint, Zs.: Arcas Swainson, 1832 is revisited: review of some species-group names, identification of the sister group and a key for species (Lepidoptera, Lycaenidae: Eumaeini)

Ventral hind wing brilliant metallic goldish green densely scattered with black scales (from S Mexico via Mesoamerica, E Andes, Amazon Basin and Guianas to SE Brazil) A. imperialis (CRAMER, 1775) Ventral hind wing brilliant metallic goldish green densely scattered with black scales, but with a clearly defined carmine basal disc and wide yellow-gold outer margin (SE Brazil) A. ducalis (WESTWOOD, 1832) Dorsal fore wing without androconia, female dorsal black marking narrow (E Peru) A. alleluia BÁLINT, 2002 Dorsal fore wing with androconia, female dorsal black margin wide 4 Dorsal fore wing with androconial cluster located well outside cell not touching discocellular veins (Central America via W Colombia to Ecuador) A. delphia NlCOLAY, 1971 Dorsal fore wing with discoidal scent pad and postdiscal scent patches basally touching discocellular veins 5 Ventral hind wing black median displaced distally at vein M3 then curving gently to anal margin (S Mexico via Mesoamerica to NW Colombia) A. cypria (GEYER, 1823) Ventral hind wing median band with concave angle at CuA2 then running straight to anal margin 6 Dorsal fore wing with androconial cluster outside the discal cell, smaller species ( fore wing length < 20 mm) 7 Dorsal fore wing with androconial cluster partly in the discal cell, larger species (fore wing length > 20 mm) 8 Dorsal fore wing ground colour dark green or blue with wide margin reaching discalis (E Andes of Colombia to Peru, Amazon Basin) A. tuneta (HEWITSON, 1865) Dorsal fore wing ground colour ligther green or blue with narrow margin not reaching discalis (SE Brazil) A. arcadia BÁLINT, 2002 Dorsal fore wing androconial cluster tear-drop shaped and pointed basally in discal cell, very large (> 25 mm) species (Mesoamerica) A. gozmanyi sp. n.