NORTH AMEKICAN LEPIDOPTERA. 323 



the claviform becomes a prominent feature and the ordinary spots 

 are sometimes confluent, the orbicular becomino; long; and narrow. 



In the first series the species are not very easily separable into 

 definite groups, though they afford some differences. 



Terminalis diflfers from all here in the small markings, the broad 

 dark terminal shade of primaries and the broad black margin of 

 secondaries. 



Ill some of the species of which levis and avgiistus afford good 

 illustrations, the fringes are unusually long, the maculation is distinct, 

 the median lines more or less evidently geminate, the outer darker 

 border of secondaries somewhat defined. The species are gray, with 

 a more or less distinct luteous shading. 



In the remaining species of this first series it is difficult to form 

 groups without raising each species to that rank. There are scarcely 

 two, and certainly no more than two species that agree very closely 

 in any but the generic characters, and the species homogena may 

 be, therefore, very appropriately selected to typify the group. The 

 only species perhaps separable with any justice is saundersiana, 

 which is unique by the very even and very distinctly geminate me- 

 dian lines. 



Of the second series, in which the median lines are lost, the or- 

 bicular is elongate and the spots often fused, three groups are readily 

 marked. 



Group Chandleri contains those species in which the s. t. line is 

 preceded by a series of sagittate black spots set in a whitish areole. 



Group Cibalis contains two species which are distinguished by a 

 very evident, even, broad, dark shade preceding the s. t. line, and 

 the primaries are also somewhat more produced apically, while the 

 body appears slighter. 



Finally, atrico/laris is typical of a group in which there is a black 

 streak from the reniform outward at least ((/riselcollis), or extending 

 through the centre of the wing from base t(j outer margin. 



In tabular form the series are distinguishable as follows : 



1. — Secondaries yellow Group HAYESI. 



2. — Secondaries black banded Group FASCIATA. 



.3. — Secondaries white or fuscous 4. 



4. — Median lines distinct or readily traceable 5. 



Median lines lost, maculation longitudinally confused 9. 



5. — Median space of primaries discolorous, black Group ATRIFASCIATA. 



Median space concolorous (5. 



