208 Mr. W. Schaus on 



above the lower boivler of the trunk and just below a smooth 

 enlarged postclavicular scale. Its rays are nearly uniform 

 in stoutness and articulated only quite at their extremities. 

 The scales seem to have been large, thin, smooth, and deeply 

 overlapping. 



In general aspect this imperfect fish is very suggestive of 

 Syllamus, a Clupeoid from the Chalk, both ot Europe and of 

 North America ; but it differs from the known species of 

 the latter genus in the deeper cleft of its mouth, the shape 

 of its mandible, and the relatively larger size of its maxillary 

 teeth. 



The specimen was presented to the British Museum 

 (Natural History) by the Director of the Imperial Institute, 

 during 1905. 



XXI. — Xeio Species of Heterocera from Costa Rica. — X. 

 By W. SCHAUS, F.Z.«. 



Micrantha mollita, sp. n. 



Palpi brown; frons whitish green ; vertex and collar buff, 

 shaded with light brown and with a few dark irrorations on 

 collar; thorax mottled buff and white, darkly irrorated in 

 front ; abdomen buff-brown, with paler segmental lines. 

 Fore wings: base roseate buff, sliading to grey medially and 

 from vein 2 to inner margin terminally ; some dark scales at 

 base of inner margin ; an indistinct brownish geminate ante- 

 medial line; orbicular and reniform space pale green; a 

 oreenish space below orbicular ; the co8ta medially mottled 

 grey and brown; a greyish-brown metlial shade, tinged with 

 dull green, expanding below reniform ; reniform space 

 followed by a whitish line and by a large brown space to near 

 apex, which is crossed by the fine postmedial outcurved and 

 geminate lunular line, this line being filled in wiih white on 

 costa ; a subterminal line, whitish from costa to vein 5, roseate 

 buff below 5, crossing the brown space near apex, inwardly 

 shaded with green between 7 and 4, and followed by a dark 

 brown spot between 6 and 4; a terminal interrupted black 

 line, inwardly edged with whitish j cilia green. Hind wings 

 fuscous ; a terminal black line. 



Expanse 22 mm. 



llab. yixola. 



