44 PACKARD, NOTES ON THE 



breadth, with the basal margin produced backwards and en- 

 croaching more upon the epicranium than usual. The front edge 

 contracts suddenly into a square portion resting above the man- 

 dibles and maxillge. The epicranium is small and short, deeply 

 impressed by a mesial line and divided thereby into two trian- 

 gular halves; while the occiput is transversely oblong, being 

 twice as broad as long. 



The antennae have short setiferous densely scaled pectinations; 

 in the female they are serrated, the teeth terminating in single 

 setse. Mandibles rather long and slender projecting out beyond 

 the scales of the front. 



The body of this genus is long and narrow, slender. The 

 thorax is narrow, and the pleurse of each thoracic segment are 

 very oblique. Pro- thoracic scales (being the two halves of the 

 pro-scutum) ovate elliptical. The meso-scutum is remarkably 

 small, being shorter than broad, and no longer than the scutel- 

 lum, which is of much greater length than usual. The iorm of 

 this last piece is much different from what we find in Ctenucha. 

 In form it is pentagonal, the front edge being transverse, the 

 two posterior sides forming a triangle, while the two anterior 

 sides are, though nearly parallel, yet slightly divergent. Wings 

 remarkably long and narrow : primaries nearly three times as 

 long as broad, being remarkably long and narrow as in the 

 Lithosia3. Costa straight as far as the apex, which is much 

 rounder than usual, as is also the internal angle, while the inner 

 edge is but one-fourth shorter than the costal. The nervules 

 arise remarkably equidistant, and their origins are much shorter 

 and nearer the outer edge than in the allies of the genus. The 

 short subcostal nervules run rapidly to the costal edge. First, 

 second, and fifth of equal lengths, the third not branched and 

 equal in length to the fourth, while the origins of each are 

 opposite the inner third of the fifth, which arises near the middle 

 of the discal space. Two discal nervules of equal length meet 

 to form an angle pointing inwards, from which a fold is " 

 thrown inwards along the middle of the discal space. 



Median nervules much straighter than usual, their interspaces 

 oblong and of very equal size. Origins of second, third and 

 fourth equidistant. Submedian nervure long and distinct. 



Secondaries long and narrow, the apex much produced, the 

 inner angle not reaching to the tips of the abdomen. Costa 

 convex, a little excavated just before the apex. Outer margin 

 two-thirds as long as the costa, angulated slightly on the second 



