AMERICAN LEPIDOPTERA. 49 



upou the venation, or upon the c()h)rs of the head and thorax. 

 Neither of these will give a natural sequence in all cases, and the 

 arrangement adopted here is a mixed one based upon ease of recog- 

 nition, which also associates into small groups closely allied species ; 

 though the groups are not always in the best natural relation to 

 each other ; but then we cannot hope to get natural objects in a 

 linear series in any case. 



The first two species, wliich may be considered as entitled to 

 generic rank, have the front produced in the form of a flat chisel- 

 like protuberance, and this series I have called Tornacontia. The 

 species are sutrix and megocula, the character just given separating 

 them readily from all the other species. They are larger forms, with 

 the primaries a little pointed. In siitrix the base is mainly white or 

 creamy to beyond the middle, where the lower dark half is squarely 

 cut off from the upper paler region. At first sight this species 

 looks like a larger form of teiiuicola, in which, however, the front 

 is merely inflated. Megocula has the primaries entirely gray, the 

 orbicular a small black dot, the reniform large, white ringed, promi- 

 nent, s. t. line white. It is a peculiar and easily recognizable form. 



Two species, angudipennis a,nd Jiavicosta, have the front conicallv 

 produced and abruptly cut ofl" at the tip. These may be called 

 Conacontia, and they resemble each other in the narrow primaries, 

 general similarity in maculation and dusky thoracic disk. They 

 are easily associated with lanceolata on superficial characters, agree- 

 ing fairly well also in size. 



In Jiavicosta the secondaries have a yellowish tinge and the pale 

 shades of primary are distinctly creamy. The light color extends 

 along the costal region to the s. t. line, usually unbroken, but some- 

 times tending to become interrupted beyond the middle. 



Angudipennis much resembles this, but the secondaries are gi'ay 

 rather than yellowish, and the costal region of primaries is white. 

 This white space is much narrower than in Jiavicosta, and is always 

 more or less interrupted at and beyond the middle of the wing. 



In all the other species the front is flat, protubei-ant or bulging, 

 smooth or a little roughened, but never either conical and truncate 

 or chisel like. There is some little individual variation here within 

 specific limits, which makes it impossible to use this modification 

 further for main divisions. 



Terminimaculata is altogether difl'erent in color from all the other 



TRANS. AM. ENT. SOC, XXVII. (7) SEPTEMBER, 1900 



