352 GROTE AND ROBINSON. 



The specific name which we have given this species is that given it 

 in MS. by M. Guenee, who possesses it in his Collection at Chateaudun. 

 Our thanks are due to M. Guenee for much valuable information rela- 

 tive to American Noctuidae, communicated during our recent visit to 

 France, and which has assisted us materially in identifying the already 

 noticed species of the Family. 



Agrotis muraenula, n. sp. (Plate 7, fig. 48, 9-) 



9. Size moderate; form rather stout. Pearly cinereous. Head 

 and thorax, above, grey, immaculate. Antennae slender, simple. La- 

 bial palpi whitish cinereous, stained with blackish at the sides. Under 

 thoracic squamation pale cinereous, l^egs cinereous, darker outwardly; 

 tarsi sub-annulate, marked outwardly with whitish. x\bdomen whitish 

 cinereous. 



Anterior ^^ings cinereous, evenly frosted with equally mixed whitish 

 and dark scales. Ornamentation obsolete. Transverse anterior line 

 marked on costa by two blackish marks between which are pale scales; 

 below costa the line can with difficulty be discerned; it seems to be 

 strongly dentate and irregular, preceded by pale scales. Orbicular in- 

 dicated by a small blackish stain, the annulus obsolete. Reoiform 

 vaguely annulated, diffusely and strongly stained with blackish inferi- 

 orly ; the black scales forming a prominent blotch. Transverse poste- 

 rior line marked on costa in the same way as the transverse anterior; 

 elsewhere it is sub-obsolete, being merely distinctly indicated by black 

 scales on the veins, succeeded by wider white dots, these edged out- 

 wardly again more faintly with blackish. Thus the line, obsolete on 

 the interspaces, may be considered geminate, its component dark lines 

 including white scales between them, though visible only on the ner- 

 vules. Very faint traces, merely, of a subterminal line. A very nar- 

 row, broken, black terminal line. Secondaries immaculate, white, 

 glossy, faintly dusted with cinereous about the apices; veins marked 

 with cinereous ; fringes white. Along external margin, superiorly, are 

 narrow iuterspaceal marks, the fragments of the dark terminal line. 

 Under surface of primaries cinereous, whitish along internal margin. 

 Faint traces of a transverse line on the nervules and some dark scales 

 on the cross vein. Secondaries white, immaculate, evenly dusted with 

 cinereous scales over costal region. 



Expanse, 38 m. m. Length of bodij^ 17 m. m. 



Habitat. — Atlantic District. (New York ! Rhode Island !) 



Easily distinguished by the pearly grey primaries with their obsolete 

 ornamentation, and by the peculiar guttate form of the transverse pos- 

 terior line. 



