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DESCRIPTIONS OF SOME NEW SOUTH AMERICAN 

 ABCTIABAE, WITH NOTES. 



By THE HON. WALTER ROTHSCHILD, Pii.D. 



IN the "Catalogue of the Lepidojitera Phalaenac in the Britisli Museum " 

 the genera A~iitirp//rs, GonolreplicH, and Antaxia are jilaeed among the 

 Si/ntomi(l((C on account of the alisence of the costal nervnre of the hindwiug. 

 These forms are otherwi.se very different from the rest of the insects contained in 

 Volume I. of the Catalogue; and as some of the forms inclnded in the Arctiadae 

 in Volume HI. show analogous neuration, I prefer to treat these three genera 

 as aberrant Arrtiadac, and ]>laco them as follows : Gn»of/-i'//ln'x following 

 Tln/nirctia, A.tatrephes following Zatrephes, and Antaxia immediately after 

 Pniinidd. 



1. Robinsonia marginata spec. nov. (PI. IV. fig. 1). 



Nearest allied to R. j>rnphitea Dognin, ])nt much larger. 



? . Head and thorax white ; palpi and antennae brown ; patagia with lirown 

 patch where they meet costa of forewing ; dorsal surface of first six segments of 

 abdomen orange buff with white median line, last two segments, ventral surface, 



and sides of abdomen white ; forelegs brown, njid- and hindlegs whitish. 



Forewing white with dark brown costal fascia and outer margin. Hindwing 



jiure white. Underside of wings as above, but costal fascia and outer margin 

 of forewing much i)aler brown. 



Length of forewing: 10 mm. 



Hub. British Guiana (Mr. AVhitlbrd, bought by him at Georgetown, but almost 

 certainly from Omai). 



2 ? ?. 



2. Robinsonia snffusa spec. nov. (PL IV. fig. 3). 



This species is nearest to It. monihi Druce. 



S . Head and tegnlae buff; base of ]iatagia grey, rest white; liiorax Imff; 

 ab<l(imen above greyish brown clothed with white downy scales wiiich give it 



a powdered apjiearanee. Forewing white, veins brownish grey, costal fascia and 



a broad outer margin from apex to vein 3 dark grey, as also are two broad streaks 

 running between veins 3 and 4 and 4 and 5 halfway across the wing ; inner 



margin grey. Hindwing white, veins slightly washed with grey, except veins 



1 and 2. LInderside as above. 



Length of forewing : 10 mm. 



Hall. Fonte Boa, Upper Amazons, M.-iy I'.ioO fS. M. Klages). 



2 Si. 



3. Robinsonia multimaculata spec. nov. (PI. IV. fig. .^>). 



Nearest to //. poli/jiliKiiK Scliaiis. 



i. Palpi lihick with white hiteral |iiitches ; hrad white with Mack liar above 

 irons, back of liead scarlet; antennae brown; tlmvax bright brown : le-jiilae 



