AMERICAN LEPIDOPTERA. 



arises from the depressed basal portion, is abruptly bent and tapers 

 to a long acute tip, extending somewhat beyond the lower angle of 

 the tip of the harpes. 



Interoceanica has moderately curved, rather narrow harpes, which 

 are dilated to form a broad curved tip, in which the lower angle is 

 acute and the upper is obtusely cut. The tip is fringed with spines 

 for its full extent, and there is a triangular patch extending in from 

 the lower angle which is also densely spinulated. The clasper is a 

 very short, slightly curved, stout, cylindrical claw, with an obtusely 

 truncated tip. It will be seen, therefore, that there is no lack of 

 structural characters to separate all these species, however much 

 they may be superficially alike. 



Juvenilis is a smaller species than those just described and with 

 even narrower wings. In color it is a rather bright clay yellow, 

 with all the usual markings evident. The median lines are single, 

 the t. p. crenulated and not followed by an even outer shade. The 

 median shade line is angulated and very distinct. The size and 

 color easily mark the species, and the sexual structure is equally 

 distinctive. The harpes are moderate in width, a broad, rather 

 obtuse process being sent out inferiorly. The tip is not specially 

 modified and has only a few longer, stiff hairs. There are two 

 claspers : one of them arises near to the middle, is broad at base, 

 semi-cylindrical and tapers to an acute point. It is only a little 

 curved and extends more than half-way to the tip. The other is 

 much shorter, but more curved, cylindrical, stout, rather obtusely 

 tipped and arises close to the tip of the harpes. 



Immanis, stramentosa and obliqua differ from all the preceding by 

 the presence of a pale shade following the t. p. line. The latter is 

 single or, if the outer portion is indicated, the pale shade forms the 

 included space. Besides this pale shade there is no prominent 

 maculation, though all the lines and spots are outlined ; but there is 

 a tendency to darken the median space. The European micacea 

 belongs in this series, and our American representative is immanis, 

 which is larger though otherwise closely resembling its foreign ally. 



Immanis is the largest species in this series and it shows the least 

 contrasts. In color it is a dull earthy brown, hardly darker in the 

 median space, and with the t. p. line about parallel with the outer 

 margin. The harpes of the male are very broad at base, abruptly 

 bent above and narrowed from below toward a somewhat lappet- 

 like tip, which has a rather sparse fringe of spinules. There is a 



TRANS. AM. ENT. SOC. XXVI. MAY. 1H99. 



