34 FOSSIL BUTTERFLIES. 



LETHITES SCUDDKI:. 

 Sati/ritcs Sciuld. (iiec Blanch. -Brulle), Rev. ct Mng. de Zool., 1871-71.', GO. 



The costal border of the fore wing (PI. I, fig. 5) is gently and equably 

 curved, the apex moderately acute but well rounded, the outer margin, except 

 at its extremities, nearly straight, and the inner border straight or almost so; 

 the outer border is a little shorter than the inner and about three-fifths the length 

 of the costal margin. 



The costal nervule terminates slightly beyond the middle of the costal 

 margin, its basal two-fifths presenting a considerable and almost uniform ex- 

 pansion, which tapers rather rapidly at the tip, and reaches nearly to the middle 

 of the upper border of the cell. The subcostal nervule is very slight on the 

 basal half of the wing, closely connected with the posterior surface of the 

 swollen portion of the costal nervure and only divaricating from that vein 

 after the latter has lost its tumidity; it emits its first superior nervule at 

 slightly more than three-fifths the distance from the tip of the bulbous portion 

 of the costal nervure to the upper apex of the cell; its second at midway 

 between the origin of the first and the tip of the cell; its third at midway be- 

 tween the upper apex of the cell and the origin of the fourth, which arises at 

 about two-fifths the distance from the base of the third to the outer border of 

 the wing. The first superior nervule terminates near the middle of the outer 

 two-thirds of the costal border, the second midway between the apex of the 

 first and third; the third terminates just above, and the fourth at or scarcely 

 below, the tip of the wing. The first inferior subcostal nervule arises at a very 

 short distance beyond the base of the second superior nervule, and curving 

 rather strongly, terminates in the middle of the upper half of the outer border; 

 the -;eei>iid inferior nervule is emitted from the first inferior as far beyond the 

 base of the latter as that is beyond the base of (lie second superior nervule; 

 at its origin it is directed inward as well as backward (forming the upper ter- 

 mination of the cell) and passes backward in a small, narrow and rather strongly 

 curved bow, bent below more than above, beyond which it assumes a course 



