216 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxv. 



Undidaris is very dark smoky, almost black, with velvety black 

 lines and the s. t. line is broken by white scales opposite the cell. 

 There is none other like it, and recognition should be easy. It is 

 one of the species that was referred to Ypsia Guenee. 



The variety umbripennis differs from the type in that the median 

 area below cell is a little paler, more brown in color, and over the 

 line- of the s. t. line from the inner margin toward the middle there 

 is a somewhat violaceous shading. The white interruption to the 

 s. t. line tends to become lost in the variety. 



JErughioxn. which has also been placed as a variety of undidaris, 

 is really a very good species, recognizable at all times by the bright 

 mossy green powdering on the primaries of both sexes. A real 

 fresh example of this form looks very handsome with its bright 

 green against the nearly black base. 



Insuda is more gray, especially in the male, but has the same 

 general type of marking as in undidaris. In the male the terminal 

 area in both wings is paler, and in both sexes the reniform is out- 

 wardly marked by white scales. This species occurs in Arizona only 

 and seems to be not uncommon, locally. 



Norda and minerea are much more contrastingly marked, especi- 

 ally in the male, and they are streaked and mottled with yellowish 

 and dark brown. They have essentially the lunata type of macula- 

 tion, but are somewhat smaller, a little slighter, and a great deal 

 more mottled. In the female, in which there might at times be a 

 question between the species, the abdominal structure affords a ready 

 point of distinction. 



Norda is much darker, mahogany brown in the male, less strigillate 

 or mottled, with the terminal areas often brilliantly bluish. The 

 females are usually strigulated and crossed by undulated transverse 

 lines. 



Minerea is much more mottled throughout, never so dark nor so 

 brilliantly contrasting, but after all of the same general type, the 

 difference again being more a matter of degree. In the female, too, 

 the colors are not nearly so dark, and the transverse markings are 

 correspondingly more obvious. 



Lunifera and lineosa are two other allied species, smaller and of 

 slighter build than those just preceding and, on the whole, gray 

 rather than brown in color, without contrasting blue areas at any 

 time. There is quite a bit of variation in the wing form here, and 

 while some examples of lunifera have the wings typically Homop- 

 tera-like, others, especially of lineosa, seem to have them much 

 broader, with more arched costa and outer margin, like some Geome- 

 trids. The change is gradual, however, and there is no other charac- 

 ter that seems to distinguish these forms from the rest of the species. 



