EvolulioH and Taxonomy ,og 



Zygffi.m m the structure of the huuieral area of the hind 

 wmgs. I„ „o„e of them is costa preserved. The American 

 genera .ncluded here are AcoloWn.. Triprocris, PyroZZ 

 ^arnnna Eurkromia. Dakana, DMasys, Lyoo.norp,a, aI 

 a/./^« and Co^mosoma. Of Euchromia I have studied only 

 exot.c forms; Horama ^nA Erruca are unknown to me but 

 probably belong here also. The position of the Ctenucl id^ 

 I have not deternnned. Superfan.ily Zvg.Bnina. 



CC. THE FRENUI,UM-I,OSERS. 



This division Of the order includes those families of I.epi- 

 doptera in which the frenulum has been supplanted by a 

 greatly extended humeral area of the hind wmgs, (see p 88) 

 In some of the more generalized forms a rudimentary 'frenu: 

 um persists iSericaria, Peropkora) ■ in others it has been re- 

 tained by the male ^Drepana). This division includes three 

 groups of families; the Frenulum-losing Moths, the Skippers 

 (Hespendas), and the Butterflies. ^^ 



D. The Frenidum-losing Moths. 



E. Moths in which cubitus is apparently three-branched. 

 __^ Superfamily Saturniina.* 



A. Moths i„ which the base of costa of the hind wings is preserved 

 remote from the costal border of the wing. This if shown bylhe 

 presence of an "intercostal vein " {SericaHa, Fig .2 ) (See n 78 t 

 Frenulum preserved in a rudimentary state. ' (See p. 78.) 



AA. Moths lacking an " intercostal vein " (TU ^^""^ m ^°^^^''"°^- 

 ians.) "uercostal vein. (These are the true Saturn- 



B. Generalized Saturnians. In these vein V, retains its primitive 

 position, midway between radius and cubitus ; and there L thrle 

 anal veins in the hind wings, the distal part of vein VIII being pre! 

 served (Fig. 31.) Frenulum preserved in a rudimentary state 



BB. More Specialized Saturnians. Vein V. J^I^^Z^t^ 

 ently a branch of radius (Fig 30) ; anal area of hind wings^wirnot 

 more than two veins, vein VIII having been lost ; frenuLi entire 

 ly superseded by a greatly extended humeral area 



' ealtgTient'"' ^^^^^ ^'' ^"^^ ^ ''''''; ^^ ^^^^^^-^^^ ^o 

 ^ Family Hemii^eucid^. 



