i8 LEPIDOPTERA. 



appears on the wing earlier than the other, som'^times two or 

 three weeks earlier. In addition to all this a very important 

 structural distinction has been pointed out by Mr. F. N. 

 Pierce, in that the forms and positions of the spines and 

 hooks of the harpes, and the shape of the uncus — both portions 

 of the anal armature of the male — differ greatly and are quite 

 constant and reliable. 



4. M. furuncula, Tr.; bicoloria, Btmid. Cat. — Expanse 

 of male | to 1 inch, of female f inch. Fore wings pale-brown, 

 red-brown, purplish-brown, or pale umbreous to the middle, 

 thence with a sharply perpendicular division, white or brownish- 

 white to near the hind margin ; or the outer half only paler ; 

 or the brown colour continued throughout ; or the whole 

 surface pale buff; hind wings pale smoky-brown. Thorax 

 and abdomen slender. 



Antennse of the male simple, minutely ciliated, pale 

 brown ; palpi narrowly tufted but rather porrected ; whitish- 

 brown ; head light brown ; thorax slender, pale brown, drab 

 or whitish-brown, the collar faintly barred with darker 

 brown ; top crest obscure ; back crest formed into two 

 rather prominent tufts, tipped with deeper brown ; fascicles 

 small, white ; abdomen slender, smoky-brown, having minute 

 crests on the first five segments, those on the fourth and 

 fifth the largest ; lateral tufts small and compressed ; anal 

 tuft spreading, dark brown. Fore wings narrow at the 

 base, broader behind ; costa very gently curved ; apex bluntly 

 angulated ; hind margin oblique, gently curved, or even a 

 very little bent in the middle ; anal angle rather sharp ; 

 dorsal margin faintly hollowed ; colour pale brown or drab, 

 clouded or marbled with umbreous or reddish-brown ; basal 

 line faintly indicated by pairs of minute brown streaks ; first 

 line obscurely white, forming a lai'ge curve edged on each side 

 with brown or black from the dorsal margin to the median 

 nervure, thence far more obscure ; of the second line the base, 

 just beyond the middle of the dorsal margin, forms part of a 



