•20 ZYGCENID.E AND BOMBYCID.'E 



subcostal arises very near the upper discal ; second subcostal arises a 

 little beyond the middle of the tirst subcostal ; third subcostal is short, 

 and arises a little beyond the middle of the distance between the apex 

 of the wing and the origin of the upper discal nervule. The fourth 

 subcostal branches off very near the apex, and is very short, being but 

 one fourth as long as the fifth subcostal, which last arises at a less 

 angle from its nervure than in Ctenucha. The discal nervures are 

 much more curved inward than in Ctenucha. The median, beyond 

 where it throws off its fourth median, is bent upward exactly parallel 

 with the costa. Though longer, the nervules are thrown off much as 

 in Ctenucha, but the distance between the origins of the third and 

 fourth medians is proportionally greater than in Ctenucha. 



"Secondaries not quite half as broad as they are long, being much 

 produced towards the apex, and behind reaching to the basal third 

 of the abdomen, Costa straight, convex near the base ; apex acute ; 

 outer edge nearly three times as long as the inner ; straight on the 

 outer half of its length, but becoming a little convex toward the 

 internal angle, which is well rounded, while the inner edge itself is 

 straight. The subcostal goes remarkably straight to the apex, where 

 its curves a little downward ; it throws off a single straight nervule 

 a little within the outer third of its length. The upper discal is a 

 third longer than the lower, which is the stouter of the two. The 

 three first medians are very short, one third as long as the whole 

 median, the third shortest. First curved, second and third straight, 

 fourth curved downward near its origin. The submedian is obsolete 

 at its basal third, the terminal pordon being more like a nervure than 

 a mere fold. It is close to' the internal and remote from the median. 

 Internal straight, cutting off a large triangular area comprising the 

 internal angle. 



" Legs rather long, slender, thinly scaled, the spines minute and 

 weak. The hind legs differ from Ctenucha in being much more slender, 

 not at all swollen. There are the same proportions in the length of the 

 joints. 



"Abdomen broad, and acutely pointed at the tip in both sexes, 

 with slight lateral tufts along the sides. The female tip is more obtuse 

 than in the male, thus approaching female Procris, with its truncated 

 tips, more than Ctenucha with its simple pointed tip. The genitals are 

 simple, and concealed within the eighth ring of the abdomen.* There 



* In this place A. S. Packard, jun., suggests that the genital apparatus afford ex- 

 cellent generic and specific characters in this family and probably in many others. 



