NORTH AMERICAN LEPIDOPTERA. 79 



The antennal structure in Zygaena is peculiar; the member is stout, 

 dilated toward and obtusely terminated at tip. 



Ino differs in having the antennae pectinated in the % . So strongly 

 marked are the differences between Zygaena and Ino that it seems to 

 me that distinct sub-families are indicated. 



Pyromorpha H-Sch. most nearly agrees with the true Zygaenidae in 

 venation of primaries — (compare figs. 23 and 24 pi. Ill) but differs very 

 essentially in venation of secondaries, in which the costal vein is entirely 

 wanting. The head structure is not unlike that of /fto, and the ocelli 

 are large and prominent. The family Pyromorpldnae H-Sch. as based 

 on this genus is well founded, and should be recognized. 



Harrisiaa Pack, is a much narrower winged insect and yet agrees in 

 essential characters with Pyromorpha. It should be associated with it. 

 Acoloithus Clem, very probably should be referred to the same family, 

 but I have not been able to examine the species carefully. The an- 

 tennae are not thickened but are lengthily pectinate in the % . 



Several others of our genera lack the costal vein of secondaries, but 

 differ very decidedly in other respects. 



The Syiifonwklae are defined by Herrich-Schaeffer as small butterflies 

 with filiform antennae, long abdomen and short secondaries ; ocelli 

 wanting, tongue corneous. Primaries with one internal vein, 7—10 from 

 the same stalk, a long distance between 5 and 6. Secondaries with 

 five or six veins. 



To this family, which differs so decidedly in venation from Zygaena, I 

 would refer Lycomorpha, Anatohnis, Gosmosoma and probably Syn- 

 tomeida. 



Lycomorpha is unlike Syntomis in superficial appearance, but agrees 

 in essential structural details. The secondaries lack the costal vein and 

 have only one internal vein. The subcostal is furcate at the end of the 

 cell, and the submedian is three branched. There are therefor but six 

 veins. Dr, Packard figures the head structure, which is essentially like 

 Pyromorpha, save that the ocelli are wanting. The genus is a peculiar 

 one, with strong affinities to the Lithosiids. 



Anatolmis is like Naclia, save that the ocelli are present. The sec- 

 ondaries are six veined, and in the primaries 6-9 are from one stalk. 

 The genus is intermediate in structure between Lycomorpha and Cosmo- 

 soma. 



Gosmosoma resembles Syntomis in having partially pellucid wings 

 but differs by having the ocelli evident. I have been unable carefully 

 to examine species of Syntomis, and am not in a position to make com- 



