NO. 1140. NOBTR AMERICAN NOCTUIDAE— SMITH AND BYAR. 95 



disk, tipped with white. The disk of the thorax is marked with suioky 

 bhick, and the patagiae are bhick edged. The primaries with all the 

 ordinary inaeulation distinct. Transverse anterior line geminate, black, 

 the included space white; the lower part of the basal space is much 

 darker than the upper, where the smoky scales overlying the white 

 base are rather sparse. The transverse anterior line is geminate, black, 

 toothed on the veins, the two parts e(]ually distinct, the intervening 

 space white. As a whole, its course is a little oblique outwardly. Most 

 of the veins through the median spaces are white marked, and on the 

 internal margin is a black mark which does not quite cross the median 

 space. The median shade line is marked on the costa, running 

 obliquely to the reniform and then very close to the transverse pos- 

 terior line to the internal margin. It is not well marked, but a little 

 darker than the smoky suffusion of the wing. The transverse posterior 

 line is geminate, the outer line black, distinct, lunulate, strongly den- 

 tate on the veins; the inner blackish and best defined by the white 

 included space. Beyond the transverse posterior line the wing is 

 nearly black, relieved by a dentate white snbterminal line. There is a 

 white line at the base of the fringes, which are black, or nearly so, and 

 cut with white lines. The basal dash is merged into the general dark 

 shading of tlie lower part of the basal space. The orbicular is rounded, 

 or nearly so, black ringed and white centered. The reniform is of mod- 

 erate size, kidney shaped, black ringed, and centered with the smoky 

 ground. Secondaries yellowish white in both sexes; in some specimens 

 with an obvious outer darker line. There is a broken terminal line, 

 and the fringes are more or less evidently cut with blackish. Beneath, 

 both wings are yellowish white, powdery, with a more or less obvious 

 outer line and discal spot. 



Expanse, 1.20 to 1.35 inches (30 to 33 mm.). 



Habitat. — Canada to ]*few Jersey, west to the Mississippi; Canada in 

 June and July; Manchester, Vermont, August 3; Lancaster, New York, 

 August. 



This species is quite different from anything else in the genus, and 

 has been heretofoie associated with diphtheroides under the generic 

 term Microcoelia. In all structural characters it agrees with Aero- 

 nycta, and I can not see any reason, except that the markings are a 

 little different, for removing it from the present genus. It is well 

 associated with the species with which it is here placed, and the 

 sexual characters justify the reference, though they are unique, and 

 remind one rather of tritona, or evenfuneralis. The harpes are broad, 

 somewhat oblique inferiorly, and pointed at the tip. The clasper is 

 very strong, the inferior plate produced into a curved hook at the 

 lower margin, while from behind the middle of the upper margin there 

 arises a very long, stout, curved, hook-like process which can best be 

 compared to that infinieralis. The front is round, but hardly bulging, 

 and the leg structure is normal, not differing greatly from the species 

 with which this is associated. 



