AMERICAN LEPIDOPTERA. O 



interspace between the median shade and the t. p. line. This spot 

 is actually present in every species except semmsta, but not in every 

 specimen. It is sometimes obscured by darker shadings as in 

 ferrealis and sometimes washed out; but with a good series at hand 

 it will be found in all except as above noted. There is also a more 

 obvious dentation on fringes of the primaries, and the excavation 

 below the apex of the secondaries is well marked. Semiusta is 

 again an exception. 



Added to these superficial characters the vestiture is uniformly 

 hairy, and there is a very uniform type in the male genitalia. The 

 harpes are rather long, in a general way parallel, the tip oblique 

 and furnished with a small series of spinules, which may be at the 

 extreme point only, or may occur along the entire oblique edge. 

 Near the base at the upper margin is attached a moderately long, 

 curved, corneous hook or clasper, and from this a corneous ridge 

 extends diagonally to the tip. It extends even beyond the tip in 

 the form of a mere point or as a slender curved process, varying in 

 the species, and at about the middle of the ridge there is a broad 

 tooth or spur of varying form. This description is general of 

 course, and each species shows its own peculiar combination of 

 these characters. It justifies the association of the species placed in 

 the first series on color characters alone. 



Semiusta is somewhat pale, rusty red-brown, without contrasts in 

 maculation ; all the lines even, and all the usual markings traceable. 

 It is easily recognizable by the even fringes and the absence of the 

 dark patch in the submedian interspace. The harpes of the male 

 are rather narrow ; the clasper is moderate in length, stout, curved, 

 obtuse at tip; the tooth from the oblique ridge is long and sharply 

 pointed, while the process extending beyond the tip is also long, 

 slender and a little curved to the acute tip. There are only a few 

 spinules at the extreme outer tip of the harpe. 



Hemiiia and disposita are of a soft creamy gray color, the latter 

 with a reddish or brownish shading that lightens it throughout and 

 relieves the markings. In both there is a longitudal black line at 

 the base ; both have the ordinary spots of good size, outlined in 

 black, and both have a long tooth from the t. a. line, almost reach- 

 ing the t. p. line in the submedian interspace. In fact, so far as 

 maculation is concerned, the two may be considered alike, the uni- 

 form soft creamy gray, free from any admixture of reddish, serving 



TRAN.S. AM. ENT. SOC. XXVII. AUGUST, 1900 



