NORTH AMERICAN LEPIDOPTERA. . 83 



Eudryrts is -still less Zygaenoid in structure than is Alypia. Under 

 the term Eudryas I include as well C'lrifi and Copidryas, not because I 

 consider them synonyms, but because they seem to agree in essential 

 family structure. The head structure is essentially nocfHi/orm, and le.ss 

 like Zyyaeua than Alypvt. The antennae are more nocfiiidoiis, those of 

 Ciris being bipectinate in true Bomhycid fashion. Tlie body structure 

 diflFers in nothing from the Bombycidae or Noctuidae, and does differ 

 from that of Zygaena. In the character of the S genital pieces the 

 genus is still more decidedly noctuidous than Alypia. 'Jhe supra anal 

 plate is present, much as in Alypia, but the hook-like projection is not 

 cylindrical but flattened and somewhat spatulate (Plate III, fig. 19). 

 The side pieces are membranous, arcuate, and somewhat incurved toward 

 tip. ' Near the base of the side piece arises the corneous or chitinous 

 clasper, which is longitudinally grooved, furnished with a trigonate infe- 

 rior projection near middle, and furcate toward tip. Figure 15 of the 

 plate gives a better idea of the structure than any description can do. 

 This structure thoroughly agrees with that of the Noctuidae, or of the 

 noctuiform Bomhycids, and is very different from both Alypia and 

 Zygaena. Altogether this insect is structurally as widely separated from 

 Zygaena, as the Bombycidae are from the Noctuidae — nay further, 

 because these families agree more nearly in body structure and in vena- 

 tion, than do those genera placed into the Zygaenidae. 



The true position of Eudryas is, it seems to me, very close to where 

 Harris put it — i. e. allied to Dafana and the Notodontids. The wing 

 form, the body vestiture, the elongate abdomen, the metallic scales, tufted 

 legs ; all are Bombycid characters which cannot possibly be disregarded 

 in any reasonable classification. Though the larva are so nearly alike 

 that they are scarcely to be distinguished except by careful comparison, 

 yet I do not believe that Alypia and Evdryas are closely allied, and favor 

 their separation, giving them place in distinct families. 



In Mr. Meyer's grand collection of South American insects the Cast- 

 niares are largely represented ; and, though I made only the most casual 

 comparisons, yet I am firmly of opinion that neither Eudryas nor Alypia. 

 can remain associated with them. 



Of the other genera found under the general head Zygaenidae in Mr. 

 Grote's catalogue, Gnopliaela belongs to that " debatable ground" between 

 the Litliosiidae and the Arctiidae. The venation is Lithosiid. Cydosia 

 I have not examined. Penthetria is a composite genus, apparently con- 

 taining heterogeneous forms. Triprocris has not been under examina- 

 tion, nor have Horama and Laemocharis. Pseudalypia I have not seen 



