78 [June 



I erect this genus for a hitherto undeseribed species of N. A. Le- 

 pidoptera. a description uf which follows, and which appears to me 

 isolated from any heretofore described genera of the Order. The 

 antennal structure resembles Orgtjia: the shape of the wings recalls 

 in miniature that of certain Saturniina. 



Lacosoma chiridota. nov. sp. Plate 2, fig. 8, % . 



Anterior wings dark yellowish brown, with two undulating blackish 

 median bands, the outer of which, the broadest and most distinct ; 

 discal spot rounded, black ; terminal space with a blackish shade 

 stretching over the apex. Posterior wings dark yellowish brown crossed 

 by two arcuated darker bands which appear as the continuation of the 

 bands on the anterior wings ; fringes very short, whitish. Base of both 

 pair and internal margin of posterior wings together with thorax and 

 abdomen of a dull greenish tinge, latter darker shaded underneath. 

 Under surface of wings of a lighter shade than upper surface and 

 showina; a single distinct blackish band runnino; across both wino-s : 

 discal spot large on anterior, small on posterior wings, the former show 

 a blackish apical shade. Legs pale yellowish, head paler than thorax. 

 eyes black. % , Exp. lyL inch. 



Hah. Pennsylvania. (Coll. Ent. Soc. Philad.) 



The coloration of this species recalls that of certain Hesperidina. 



NOCTUINA. H-8. 



Microcoelia diphtheroides, Guenee. Plate 2, fig. 2, 9- 



M. diphtcroidcs. Guenee, Noet. 1 p. 34. Plate 3, tig. 7. 

 M. diphteroides, Walker, C. B. M. Noct. p. 31. 

 Anterior wings dull-green ; ordinary lines black, distinct. Basal 

 line composed of two black lines enclosing a central white line ; trans- 

 verse anterior line similarly composed, vei'y sinuate, bordering exter- 

 nally a large square black costal spot, which latter occupies the entire 

 sub-basal space, between the basal and transverse anterior lines, at the 

 co.sta. Median space large; ordinary spots lai'ge, sufficiently distinct: 

 reniform, of the same "reen as the ground of the wing', ringed with 

 black, soiled inferiorily by the brownish median shade line, which latter 

 is strongly marked at the costa and. emerging from two black costal 

 marks, forms an oblique streak between the ordinary spots, then, be- 

 L^oming discontinued, reappears below the reniform spot traversing the 



