S. Mahunka szerk.: Folia Entomologica Hungarica 63. (Budapest, 2002)

Type material - Holotype male, deposited in BMNH, labelled as: "Marcapata, / E. Peru, 4500 ft" (printed), "Rothschild / Bequest / B.M. 1939-1." (printed). The specimen is in moderately good condition: half of both antennae missing, wings slightly worn and broken. The specimen was dissected by me and databased as B.M.N.H. Rhopalocera vial number 5836. Allotype female, fore wing costa length: 20 mm, deposited in the BMNH, labelled as: "Cushi, / Prov. Huanuco. / Peru, 1900 m / (W. Hoffmanns)" (printed), "Rothschild / Bequest / B.M. 1939-1." (printed), "Bálint 8 / 28A 106" (handwritten). The specimen is in moderately good condition: left antenna missing, half of right antenna missing, wings slightly worn. The specimen is dissected by me and databased as B.M.N.H. Rhopalocera vial number 5838. Paratypes: Marcapata, E. Peru, Rothschild Bequest (BMNH, 1 female); El Topo, Rio Pastaza, E. Ecuador, M.G. Palmer (BMNH, 1 female) Chanchamayo, M. Peru, König coll., no. 459 (NMW, 1 female). Diagnosis - Comparing the new species to M. danaus, the former is slightly smaller in size, the male fore wing dorsal androconial cluster rounded (pointed in M. danaus), female dorsal wing surface is blue (bluish green in M. danaus) and the submedian line of the ventral surface shows gleaming intercellular crescents on the fore wing in cells CuAl and CuA2 and across the entire hind wing (these intercellular patterns are lineal in M. danaus); the genital ductus bursae is slender and longer in the new species, with smaller posterior lamellae (cf. Figs 9, 12). Description - Male (Figs 4—5). Size: fore wing length 21 mm (= holotype). Wing shape: fore wing costa convex, apex pointed, distal margin straight, anal margin straight; hind wing costa convex, apex rounded, distal margin with convex lobe, inner margin convex and also with lobe, vein CuA2 distal terminus tailed. Dorsal surface: fore wing ground colour gleaming azure with very narrow outer margin and distal fringe brown, androconial cluster present in the apex of discal cell, basally and distally rounded; hind wing similar to fore wing but with black tail at vein CuA2 distal terminus, plus tomal and anal marginal lobes. Ventral surface: fore wing ground colour as on dorsum but with suffusion of brown scales, androconial cluster visible; hind wing ground colour warm brown with submedian vivid green vertical intercellular lines from below the costal cell to the inner margin and covered with long brown hairs, postmedian pattern with continuous vivid green vertical line and a lighter submarginal line running parallel; outer margin, tomal area, lobes and tail all black. Body gleaming green dorsally, brown ventrally. Genitalia: typical of genus (Fig. 6). Female (Figs 7-8). Size: fore wing length 20 mm (= allotype). Wing shape: fore wing costa convex with apex pointed, distal margin slightly convex, tornus rounded, anal margin straight; hind wing costa convex with apex rounded, distal margin slightly convex, lobate at tomus, inner margin convex with a lobe, vein CuAl terminus with a shorter filamentous tail and, at vein CuA2 terminus, a longer filamentous tail; tomus and inner margin lobate. Dorsal surface: fore wing ground colour bluish with wide black submarginal broder and distal fringe brown; hind