IDALUS. 21 



front, brown behind ; antennae brown ; frons and vertex of head 

 with brown spots, back of head and tegula? with paired spots ; 

 patagia edged with brown above, thorax brown ; legs whitish 

 streaked with brown ; abdomen orange-yellow with fuscous patches 

 at base and extremity, the anal tuft white. Fore wing brown 

 suffused with purple, the veins streaked with yellowish white ; an 

 orange patch on inner margin from near base to near tornus, narrow 

 towards base, expanding towards extremity; a triangular patch 

 from costa beyond middle to vein 3. Hind wing orange-yellow ; 

 the underside with some fuscous scales below base of costa. 



Hind wing with veins 6, 7 forking just before termen. 



Hah. Fb. Guiana, St. Laurent Maroni, type f J in U.S. Nat. 

 Mus. Exp. 32 millim. 



*1212 b. Idalus flavithorax. 



Idalus flavithorax, Joicey, P. Z.S. 1917, p. 265, pi. 1. f. 4 (1918). 



d . Head, thorax, and abdomen yellow, the last with the three 

 terminal segments grey-black ; antenna? white with the serrations 

 blackish ; palpi and legs tinged with brown. Fore wing pale 

 rufous, the veins, cell, and submedian fold streaked with white ; a 

 large conical yellow postmedial patch from costa to below vein 4 

 and a semicircular patch on terminal part of inner margin ; cilia 

 white. Hind wing white slightly tinged with yellow. Underside 

 of fore wing very pale rufous with the yellow postmedial costal 

 patch as above ; hind wing white tinged with yellow. 



Hah. Brazil, Rio Grande do Sul, type t d in Coll. Joice}'. 

 Exp. 36 millim. 



*1213 a. Idalus albicoxae. 



Idalus albicoxx, Schaus, Pr. U.S. Nat. Mus. xxix. p. 208 (1906). 



Antenna? of male with bristles and cilia ; hind wing with the 

 costal area greatly dilated, a patch of androconia in and bej'ond end 

 of cell on upperside, vein 8 from middle of cell. 



$ . Head yellow ; palpi brown, crimson at sides towards base ; 

 antenna? brown, crimson at base and whitish at tips ; tegula? yellow 

 with crimson spots at sides ; thorax purple-brown with some yellow 



Fig'. 6. - Idalus albicoxse, <$ . }. 

 on prothorax and crimson on patagia and dorsum ; pectus and legs 

 white, the fore tibia} streaked with brown and the tarsi with 

 crimson; abdomen crimson with two white points at base, the 



