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Show 1877.] ON N E W BUTTERFLIES. 61 3. ITHOMIA ALCMENA. 2 • Exp. 2*1 in. Allied to I. artena, Hew. (Ex. Butt. Ith. viii. f. 48), and having the same neuration of the hind wing as the female of that species, differing, however, in coloration, the dark margins of the wings being much broader and blacker; the black quadrate spot covering the base of the cell is placed at a more obtuse angle to the costa, the extracellular white spot following the same angle as the black one; near the distal ends of the median and radial interspaces are obsolete white spots not seen in L. artena, but not infrequent in other Lthomiee. The borders of the wings beneath are deep rufous; and at the apical angle of all are minute white spots. Hab. Guatemala ; Choctum in Northern Vera Paz. Mus. nostr. 4. ITHOMIA PUSIO. <f. Exp. 1*7 in. Allied to J. lyra, Salv., and J. andronica, Hew., differing from the latter in the apex of the anterior wings having only a narrow black border, inside of which up to the extracellular white spot on the wing is diaphanous. In I. andronica white spots are enclosed in the dark apex of the wing. As in I. andronica, the dark spot covering the base of the cell is triangular and not subrect-angular as in J. lyra. The 2 (exp. 1*85) resembles the male in colour, differing in the sexual divergence of the neuration usual in the Hymenitis section of Lthomia. Hab. Nicaragua, Chontales (Belt and Janson). Mus. nostr. W e have long hesitated to describe this Lthomia, owing to its similarity to 7. andronica; but having now seen a large number of specimens we consider its distinctness sufficiently apparent. 5. ITHOMIA ZYGIA. cf. Exp. 2*7 in. Anterior wings semitransparent dark brown ; costa, outer and inner margins, a spot in middle of the cell, another at the extremity, and the median and discoidal branches black; a large spot near the end of the cell and two curved bands of spots crossing the apical half of the wing, the outermost following the curve of the margin, semitransparent yellow ; two small white spots near the apex ; posterior wings semitransparent, fulvous, yellower in the cell, and towards the apex a broad black margin enclosing three white spots, that at the apex being the smallest; underside as above, the white marginal spots being more conspicuous. Female similar to the male as to the position of the markings, but darker, the white spots on the marginal border of the hind wings larger, central portion of hind wings, and middle of inner margin of fore wings, rich tawny. Hab. Chiriqui. Mus. nostr. et H. Druce. Allied to I. gonussa, Hew. SATYRIN^E. 6. PLERELLA INCANESCENS. 3 . Exp. 2*8 ; 2 3'15- Allied to P. helvina, Hew. (Ex. Butt. Het. t. 1. f. 4), the colours being similarly distributed. The black |