Ileterocera from Costa Rica. - 271 



Expanse 42 mm. 



llab. Juan Vinas, Sixola. 



Very closely allied to Dicentria {Meragisa) h'mosaj Schs. 



Psilacron arthuri, sp. n. 



cJ . Head, collar, and thorax mottled greenish bufF and 

 brown ; a black-brown transverse line on collar. Abdomen 

 fuscous above ; basal tufts greenish buff ; terminal segment 

 and anal hairs buff. Fore wings : some greenish buff at 

 base, and a black point below cell followed by a fuscous-grey 

 shade limited by the antemedial line, which is fine, black- 

 brown, geminate, somewhat oblique from costa to submedian, 

 then incurved; medially and below vein 4 grey, with darker 

 irroralioiis; a greenish-buff shade between 3 and 4 near cell, 

 above submedian medially, and about tornus ; a small brown 

 spot on discocellular, followed by a curved brownish shade 

 consisting of short streaks ; postmedial geminate, interrupted, 

 forming short velvety streaks on veins, followed between 

 veins 4-7 by a large fuscous-grey shade; a marginal dark 

 grey shade from costa to vein 4; a terminal olive-brown 

 line; terminal black streaks on veins; cilia whitisli, with 

 fuscous spots. Hind wings fuscous grey, the veins and inner 

 margin darker; a geminate postmedial line on costa filled in 

 with greenish buff. 



Expanse 37 mm. 



? . Fore wings olive-brown, shaded wath fuscous and dark 

 grey, tiie lines as in the male ; a large whitish patch on outer 

 margin from vein 2 to just above vein 4. Hind wings with 

 indistinct medial and geminate postmedial fuscous lines. 



Expanse 41 mm. 



Ilab. Juan Vinas. 



Psilacron discolor^ sp. n. 



S . Head, collar, and thorax mottled brown and greenish. 

 Abdomen above greyish brown ; dorsal greenish tufts at base. 

 Fore wings yellowish green, probably faded, shaded with 

 fuscous grey in and below cell medially; a subterminal dull 

 fuscous-grey shade from vein 4-7 ; a large antemedial 

 black space from below cell to inner margin ; a velvety black 

 semilunar spot at end of cell, and an inward fuscous shade 

 below it ; a fine incurved dark line from costa before sub- 

 terminal shade to vein 3, geminate from vein 7-3 ; a sub- 

 terminal fuscous shade between veins 2 and 3 ; a paler mar- 

 ginal line, lunular below vein 4. Hind wings brownish, 

 tniged with fuscous grey. 



