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 ; 



