1 58 



lacustrata is simple, smaller, and subacute); the discal <li>l is often surrounded 

 In a well-marked black ring (sometimes the band is so wide thai no ring is 

 formed); the wing beyond the median band is dusky cinereous, where il is 

 white in R. lacustrata ; there are two parallel, dusky, scalloped lines, seine 

 times nearly obsolete, and represented by two rows of venular black marks; 

 a distinct, white, marginal, scalloped line, ending on the' costa in front of a 

 squarish black spot. Tin; hind wings are more dusky and clouded than in 

 It. lacustrata, with usually less distinct lines: there are three scalloped lines 

 just beyond the small discal dot. and a double, diffused, marginal band; 

 beneath, the markings are much as in R. lacustrata, but the submarginal 

 white line on the fore wings is wanting. 



Length of body, i,0A5, 9,0.40; of fore wing, <?,0.52, 9.0.52: expanse 

 of wings, 1.10 inches. 



Nahant, Mass. (Moering) ; Cambridge, Mass., duly 3-21 (Morrison); 

 Brookline, Mass., June 1, August 18 (ShurtlefF) ; Albany and Sharon, X. Y. 

 (Lintner) ; New Jersey (Sachs); Easton, Pa. (Stultz) ; Philadelphia, Pa. 

 (Amer. Ent. Soc.) ; West Virginia, April 8 (Mead): "Canada, Xew York, 

 Pennsylvania" (Guenee) ; ••Saint Martin's Falls, Hudson's Bay, Canada. Nova 

 Scotia, and New York" (Walker), 



This common species differs from R. lacustrata, with which it is liable 

 to be confounded, in the darker-ashen wings, the three-toothed point in the 

 median band, in the wing being dusky or flesh-colored beyond this band, and 

 in the darker hind wings. It is very near the European R. galiata (W. V.), 

 and may prove to be identical with it. 



Rheumaptera lacustrata Packard. Plate 8, fig. 74. 



Melanippe lacustrata Guen., Pbal., ii, :?9~>, 1857. 



Walk., List Lep. Het. Br. Mus., xxv, 1296. 1862. 



ii £ and 6 9. — Ground-color white; body dull-ash. Fore wings with 

 two curved, wavy lines at base, with an acute angle on the discal space; 

 between the two lines, and within them, the wings are tinged with dull red- 

 dish-brown : beyond the two basal lines is a clear white band containing two 

 or three dusky lines; the median band is heavy, black, more conspicuous 

 than usual: it varies in width, contracting more or less just before reaching 

 the inner edge oi the wing; the angle of the outer edge on the median 

 vein is simple, unideiitate, obtuse, sometimes subacute: above the angle the 

 band goes straight to the costa, without any sinus: the band is limited by 



