AMERICAN LEPIDOPTERA. 13 



Dilatocula has somewhat broader, more trigonate wings, the apices 

 a little more pointed. The vestiture of the primaries is smooth, 

 more bright, the ordinary spots contrasting. The orbicular is round 

 and clear gray. The reniform is very large, almost as broad as long, 

 with a bright reddish flush and no smoky filling. It has a close 

 general resemblance to pexata, but is larger, and owing to the wing 

 form, has a different habitiis. The harpes are broad and taper to a 

 narrow, squarely cut-off" tip which is fringed at the edge with spi- 

 nules. Along the upper margin is a corneous thickening from 

 which arise two large, thick, pointed thumbs or processes; the inner 

 being the thicker and tapering abruptly to a blunt tip. The clasper 

 is a short, thick, slightly curved process, cut off" at tip. 



Lepida and thaxteri are totally different in appearance from all 

 the other species, seeming mottled and with a black bar betv/een 

 the median line in the submedian interspace. 



Lejnda is deep blue-gray, without reddish shadings on primaries, 

 the markings not greatly contrasting. The secondaries have a dis- 

 tinct reddish tinge. The male genitalia are very simple; the harpes 

 are broad at base, nearly even to about the middle, whence they 

 narrow evenly to a pointed tip. The clasper is moderate in length 

 and thickness and is curved, sickle shape. 



Thaxteri is shaded with reddish and has the maculatiou promi- 

 nen-tly contrasting, so that it seems marbled. The chief reddish 

 shades are at the base, along the internal margin and over the reni 

 form. It is somewhat difficult to describe the genitalia of the male. 

 The harpes narrow abruptly at about the middle, the tip is small, 

 oblique, set with spinules along the edge. Obliquely across this 

 harpe extends a broad, corneous plate, which develops in one direc- 

 tion a curved, toothed process, and in the other a long, somewhat 

 scoop shaped spur. The clasper is moderately long, not much 

 curved and pointed at tip. 



Of the other species heretofore referred to Xylina, capax, denti- 

 linea and carbonaria belong to other genera, leaving none that I 

 have not actually seen. 



While, in several series, the species are closely allied, yet, as a 

 whole, they are fairly marked. Arranged in tabular form, it re- 

 quires a little tact to place and recognize the species; but if the 

 character of the basal streak be n(jt too strictly interpreted the 

 following table should serve to identify the species: 



TRANS. AM. ENT. SOC, XXVII. AUGUST, 1900. 



