576 Mr. W. Schaus on 



Expanse 60 mm. 



Hab. Juan Vinas. 



Allied to N. nyseus, Cr., and guttulata, Sobs. 



Nystalea nyseus collaris, subsp. n. 



c^ . Differs from N. nyseus, (Jr., in having the head and 

 collar dark velvety brown, almost black. 

 Expanse 57 mm. 

 Hab. Juan Vinas ; June. 



Pentobesa placida, sp. n. 



Palpi and frons dark brown and buff. Vertex, collar, 

 thorax, and abdomen buff-grey, the latter with transverse 

 darker bands. Fore wings greyish buff, irrorated with 

 violaceous-brown scales, especially in cell and along costal 

 margin ; a dark streak on inner margin from base to post- 

 medial ; a dark streak on discocellular ; the postmedial 

 punctiform, indistinct ; indistinct paired brown streaks 

 between veins from cell to outer margin ; a terminal row of 

 darker spots, preceded by fine dark lunular lines, very in- 

 distinct ; an oblique subterminal dark line above vein 3. 

 Hind wings whitish, the outer margin narrowly fuscous. 



Expanse, $ 36 mm. 



The female is darker and more distinctly marked, the hind 

 wings more smoky white. 



Expanse 43 mm. 



Hab. Juan Vinas, Guapiles, Tuis. 



Marthula rufescens, sp. n. 



$ . Palpi, head, and collar brown. Thorax deep velvety 

 reddish brown, the patagise lilacine. Abdomen above dull 

 grey-brown, sublateral black tufts on last two segments. 

 Fore wings brown shaded with lilacine at base, on inner 

 margin, medially in and below cell, and on outer margin 

 below vein 3; costal margin medially broadly shaded with 

 reddish ; lines shaded with lilacine ; the subbasal inset on 

 costa, geminate from median to submedian ; the antemedial 

 and postmedial geminate, hardly visible on costa ; the sub- 

 terminal nearly straight ; a large linear spot at end of cell ; 

 marginal dark spots between the veins. Hind wings brown. 



Expanse, $ 35 mm. 



? . The collar dark brown. The wings more uniformly 

 lilacine brown; no reddish shade on costa. Hind wings 

 fuscous brown. Underneath : the fore wings are brown, the 



