254 XOVITATES ZOOLOGICAE XXIV. 1917. 



line angled in cell, joined to which outwardlj- is a similarly coloured wedge- 

 shaped patch on median ; a similarly coloured wedge spot beyond middle of 

 costa and a .small spot below it on inner margin. Hindwing white, outer one- 

 fourth browii-grey. 



Length of forewuig : 34-39 mm. Expanse : 76-88 mm. 



Habitat. Ilesha, South Nigeria (Captain Humishrey), 2 <J(J. 



78. Rifargia cossoides spec. nov. 



S. Antennae: shaft dark brown, pectinations short, amber-brown ; head and 

 thorax deep chocolate-brown, hind part of thorax pale greenish grey, edge of 

 tegulae dark rufous ; abdomen rufous cinnamon-chocolate, anal segment above 

 greenish grey, anal tuft mixed greenish grey and rufous. 



Forewing : basal one-third above median fold deep chocolate-brown with some 

 dark rufous marks, a deep chocolate-brown apical patch tinged with rufous, 

 rest of wing greenish grey washed with brownish with a number of more or less 

 obsolete double brownish sinuate bands, a black crenulate-angulate sub- 

 terminal haii-line.^ Hindwing deep brownish chocolate, a median paler in- 

 definite band, and a grey and black tornal patch. $ similar but paler, and 

 light part of forewing whitish grey with no greenish tinge. 



Length of forewing : 32-38 mm. Expanse : 72-87 mm. 



Habitat Fonte Boa, Upper Amazons, May 1906 (S. M. Klages), 5 ,S3 

 type ; Santo Antonio do Javary, Upper Amazons, ^lay 1907 (S. M. Klages), 

 1 (? ; Aroewarwa Creek, Maroewym Valley, Surinam, April 1905 (S. M. Klages), 

 1 (J ; Christianeburg, Rio Demerara, British Guiana, 1 5. 



79. Rifargia terebroides spec. nov. 



cJ. This insect looks exactlj' like a melanistic Cossus terehra. 



Antennae serrate, shaft black, serrations amber-brown ; head and thorax 

 sooty brown, two transverse black lines on the tegulae ; abdomen brownish 

 cinnamon-chocolate, first two segments suffused with sooty brown. 



Forewing olivaceous cinnamon suffused, clouded, and patched with sooty 

 brown, greyish moss-green, and dark grey, giving the wing at fii'st sight a mummy- 

 brown appearance ; subbasal and antemedian somewhat obliterated double 

 crenulate black lines, a greenish brown oval stigma, two double postmedian 

 bands, the first sooty brown, sinuate, reaching inner margin where it meets a 

 white spot, the second black, convexly curved, only reaching vein 3, two subapical 



black streaks and a black crenulate subterminal hair-line. Hindwing dull 



brownish chocolate. 



Length of forewing : 31 mm. Expanse : 70 mm. 



Habitat. Potaro, British Guiana, Jlay 1908 (S. M. Klages), 3 SS type ; 

 Tumatumari, British Guiana, January 1908 (S. M. Klages), 1 S ', British Guiana 

 bought at Georgetown (Rev. M. \Vhitford), 1 S ; Aroewarwa Creek, Maroewym 

 Valley, Surinam, March— April 1905 (S. M. Klages), 2 <?<?; Fonte Boa, Upper 

 Amazons, October 1906 (S. M. Klages), 2 ^S. 



80. Rifargia biplaga spec. nov. 



(J. Antennae dark rufous brown ; head and thorax black-brown, out half 

 of tegulae rufous brown ; abdomen brownish cinnamon. 



