NOVtTATES ZOOLOOlCAE XXIV. 19l7. ' 475 SOME NEW MOTHS OF THE FAMILIES ARCTIIDAE AND EUPTEROTIDAE. By lord ROTHSCHILD, F.R.S., Pu.D. AKCTIISAE. 1. Robinsonia irregularis, sp. no v. (J. Pectus du'ty yellow ; antennae shafts black, serrations grey ; head olive-grey-brown, five white dots on frons, one white spot on vertex ; tegulae olive-grey-brown with two white patches, patagia white edged with olive-grey-brown, rest of thorax olive-grey-brown with a median orange line and two lateral white tufts ; abdomen orange, subdorsal bands reaching to penultimate segment sooty grey. Forewmgs olive-brown-grey, a white dot in cell, a large irregular white patch below median, an elongate streak-like white patch below vem 1, six irregular intranervular elongate white patches beyond middle of wing, an indistinct white submarginal spot between veins 1 and 2. Hindwings semivitreous white, a pale-grey patch on and around tornus. Length of forewing : 19 mm. Expanse : 42 mm. Habitat. Cuyaba, Matto Grosso (Paul Zobrys), 1 $. 2. Neidalia irrorata, sp. nov. (J. Antennae, head, and thorax tawny orange tinged and somewhat suft'used with scarlet ; abdomen orange clothed with long hair mixed orange and crimson. Forewing golden yellow densely freckled and irrorated with scarlet, an ante-and a postmedian line and fringe brown-grey ; a scarlet stigma with a grey point. Hindwing orange-scarlet tinged with jDale crimson. ? larger, antennae huffish brown ; head an thorax golden orange .suffused w ith red ; abdomen rosy salmon colour, anal segment and tuft golden buff. Forewing golden yellow much less freckled and krorated with scarlet than in the o , nervures scarlet, ante-and postmedian bands scarlet with a few grey marks, frmge and distal half of inner margm brown-grey. Hindwing salmon colour. Length of forewmg : S 15 mm., ? 22 mm. Expanse : (J 34 mm., ? 50 mm. Habitat. Yahuarmajo, South-East Peru, 1,200 ft., February— March 1912 (H. and C. Watkins), 1 cJ, 1 $. o. Idalus albidior, sp. nov. $. Pectus white suffused and freckled with crimson ; antennae grey-brown, outer one-third white ; head white ; tegulae white edged with pale crimson, l)atagia wliite with a golden and two pale-crimson patches ; rest of thorax white with two pale-crimson lines and two grey dots posteriorly ; abdomen first three segments rose-crimson with two dorsal white dots, rest of segments creamy white slightly tinged with rose at the edges. Forewing white, base with two slate-grey dots, four subbasal elongate slate-grey spots of various lengths, basal half of cell slate-grey, distal half yellow ;
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