110 BULLETIN 48, UNITED STATES NATIONAL MUSEUM. 



course. Occasionally black scales, more or less massed into loose spots, 

 also precede the line and farther define it. The terminal space darkens 

 beyond this line to the margin, but leaves the apical portion free and 

 ])ale. A brown terminal line followed by a yellowish line at the base 

 of the fringes. The ordinary spots small and marked by elevated black 

 scales. Secondaries yellowish fuscous to blackish, immaculate or with 

 a lunate spot, usually with a well marked dark terminal line. Beneath, 

 fuscous to blackish, with a more or less marked extra median line and 

 discal spot, both of which are sometimes obsolete. 



Exi)anse of wings, 21 to 26 mm. =0.85 to 1.05 inches. 



Habitat. — Nova Scotia to Virginia; Minnesota; Central States; 

 New York in May. 



A specimen from the National Museum, collection C. V. Riley, is 

 marked " May G, '84, on Alder." 



This little si)ecies does not seem to be common, but is easily recog- 

 nized by the very even median lines closely resembling in course those 

 of Bomolocha deceptalis, and by the pointed fore wing\s. 



There is little variation except in the shade of brown over tlie gray 

 base and the consequent contrast of color. The male is darker and 

 more even in tint as a rule, the bluish shade dull and obscure. 



Genus PLATHYPENA, Grote, 

 1873. Grote, Bull. Buff. Soc. Nat. Sci., I, 38. 



Head moderate in size, front very narrow, with a jiointed tuft. Eyes 

 large, prominent, globose, naked. Ocelli distinct, situated close to the 

 componiid eye and midway between the base of the antenime and the 

 posterior angle of the eye. Tongue moderate. Palpi moderate in 

 length, decidedly shorter and a little oblique in the male; longer and 

 straight in the female ; the terminal joint very short and obtuse in both 

 sexes. Antenna', long, extending beyond apical third of innmaries; 

 simple in both sexes, the male finely ciliated only; inserted well for- 

 ward, almost on the front. IJody moderate in the female, robust in the 

 male, the thoracic vestitnre scaly, a little loose in both sexes, perhaps 

 a little more prominently so in the male. Abdomen conic, cylindrical, 

 extending to the anal angle of the secondaries, (juite prominently tufted 

 on the dorsum. Legs (piite robust, moderate in length, the spurs of 

 the middle and hind tibia' not excessively long. Under side of body 

 somewhat woolly in the male. Wings large as a whole. Primaries 

 narrow, apices rectangular or a little acute, outer margin moderately 

 rounded, oblique; inner margin sinuate, the hind angle prominent, a 

 little produced, more so in the male. Secondaries broad, outer margin 

 quite evidently excavated below the apex in the female, almost even in 

 the male. 



This genus differs fiom Ihipvna in the more robust structure, the 

 difference in bulk between the sexes — the male being larger, more 

 I'obust and broader winged — in the short palpi and in the sinuate inner 



