Dec, 1903.] Packard: Genera of Bombycine Moths. 247 



I Male. Pront of the head rather short and unusually broad ; it is not exactly 

 square as in Oxytenis, but is a little narrower in front than on the vertex. Male an- 

 tennae well pectinated to the tip ; the branches being long and ciliated, and drooping 

 so as to be folded close together as in Platypteryx, etc., not spread wide open as usual 

 in the Saturniidn; ; the antennal joints are short, bearing but a single pair of |ieclina- 

 tions, but they are so close as to appear as if there were two pairs to a joint. Max- 

 illary palpi well developed, united, quite long, much longer than u.sual in the group, 

 reaching down to the base of the labial palpi. Maxillary palpi well developed, in 

 my example distinct, slender, and as long as the two maxillae measured across their 

 base. Labial palpi unusually large and thick, blunt at the end, being considerably 

 larger and thicker than in Oxytenis {0. /amis) ; the basal joint short; the second 

 very long and large, thick, extending very far (for this family) beyond the front ; 

 third joint small, depressed, not so distinct as in O. lainis. Eyes moderately large. 



Fore wings of almost exactly the shape of those of Platypteryx, the apex being 

 much more produced than in Oxytenis and scjuare at the tip ; the costa is much 

 curved towards the apex ; outer edge deeply excavated towards the apex ; inner 

 angle rectangular. Venation : Very different from that of Oxytenis since II I is very 

 short arising not within the origin of the discal vein but far out near the end of I. 

 II 2 wanting. In both wings the forward discal vein much curved inward, the hinder 

 vein oblique and not curved. Hind wings full, apex not so round as in Oxytenis, 

 more angular; outer edge regularly convex and rounded ; inner edge nearly straight 

 and long; the end of the abdomen reaches a little beyond the middle of the hind 

 wings. Venation : remarkable for the presence of a long vestige of vein VIII. 



The markings are almost exactly of the pattern of those of Platypteryx. The 

 general color is that of a dead leaf ; on the fore wings is an extradiscal distinct 

 oblique line, beginning on the middle of the inner edge and extending obliquely, but 

 not wavy, to the apex. A zigzag line beyond ; this oblique line extends to the hind 

 wings, where it is also distinct, straight ; beyond it is a zigzag- line. Discal dots 

 minute, black accompanied on the fore wings by a few white scales. 



The type of this genus is Attacus honesta Stoll, IV, t. 302, C, D, 

 I 781. Druce's Oxytenis malacena from Panama is a member of this 

 genus, the species of which range from Nicaragua to the Amazons. 



Mesoleuca, gen. nov. 



Ilemileiica Walker, in part. Cat. Lep. Ilet. 15r. Mus., VI, 1855, p. 1319. 



Imago. — Male. Closely allied to Hemileuca but differing in the larger, longer 

 palpi, the shorter wings, and in the venation. 



Head as in HemiUnea, hairy and shaggy in front, of about the same width between 

 the eyes, which are of the same size as in Hemileuca. The antennce differ in the 

 joints being longer, so the pectinations are farther apart, but in their length and 

 hairiness the two genera are similar. Palpi much longer and more distinct than in 

 Hemileuca, projecting well beyond the front, but the hairs on them are bushy or 

 shaggy and irregular. The thorax and abdomen are as in Hemileuca. 



Fore wings rather shorter and broader, and the hind wings broader and rather 

 more rounded at apex. The hind wings extend as far as the end of the abdomen. 

 The venation in general is as in Hemileuca, but with the notable difference from any 



