MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



117 



£ac/es and Citheronia Druce, Biologia CVntr. Anur. l,i|.. Ilet., I, p. Itiil. 1.S86. 



Crenudia Bikmkistkk, 1. c, p. 40. 187!i. 



CItheroiiiii KiuBY, Syii. Cat. l,e|i. Het., 1. ]). 7-tL'. ISirJ. 



BasiloiHi Xeimokcex ami Dv.Mi, .Icnini. N. York Knt. Soc. II, ji. ISl. Dcr., 1894. 



£«(•/<■.•* BeitknmI'Li.er, Bull. .Vmrr. JIu.«. N. H., X, p. 442. IWi.s. 



Basilona Dy.nr, List N. .\. Li'iiiduptera, p. 7<<. 1902. 



Iinago. — The head uiul slia))i' of tliv front (uikIiiuuIoiI) as in ('itheronia. The ffoiit when 

 denuded (PI. XXX\'I. \\g. 4) di.stiiictly trianoiihif, wiileiiiiigtowui-d tlte veitex: eyes large and t'ldl. 

 Antennfe pectinated to the outer third, more widely l)ipectinated, and with a much larger number 

 (25) of double paiiN of pectinations than in Citlieionia (18); in 9 simple, with minute vestigial 

 pectinations, not so long and distinct as in Citheronia. Palpi very small and sliort, difficult to 

 see, not reaching the front: when denuded seen to he without a third joint, the second being 



Fig. 14. Nomeuclature nn<l numbering of the veins of llie fore anil hin<i wings of Eacles iinperialis. 



obttise at the end and a little longer than the basal one (tig. 11). Maxilla^ when unrolled nearly 

 as long as the front of the head is wide (tig. 4). very .slender and longer than in Citlieronia. 

 Thorax and abdomen .stout, sphingiform. 



Fore wings wide, the costal edge moi'e arched toward tlie apex, which is squarish, suljacute; 

 outer edge less oblicpie than in Citheronia, much .shorter than the inner edge. Hind wings 

 more rounded, the outer edge very full and rounded, and the wings extend to the end of the 

 abdomen. In the 9 the wings are broader, those of the hinder pair extending Ijeyond the end 

 of the abdomen. 



Venation (fig. l-±): Vein III, (second subcostal) wanting, wliile in Citheronia it is present: \'ein 

 IV; does not arise as in Citheronia part way. usually about lialfway, between the anterior discal 

 vein and the origin of III^, but at the outer end of the discal cell, directly in front of the discal 



