NO. 1283. REVISION OF SOME NOCTUID MOTHS— SMITH. 167 



also quite different from the allied forms, and altogether this proves 

 itself a good species without doubt. It is from Arizona. 



JVept/s resembles diffusa, but the secondaries are entirely white, the 

 dark shadings on the primaries are much reduced, much more even, 

 and the discal spot is absent in most cases. 



The genitalia are practically like those of diffusa., but the lower 

 process of clasper is a little more scoop-shaped at tip, and the tip of 

 the harpe is somewhat more narrow and pointed. Otherwise in all 

 respects the resemblance is very close. All the specimens are from 

 Colorado. 



Taken together the species recognized here make an unusually com- 

 pact group, from which rubripennis stands out at once by its red color. 

 Alhilinea and obscurior are small, very dark species in which the sec- 

 ondaries are smoky or pale only at base. The latter may easily be a 

 local variety of the former. 



Diffusa is larger and paler, with the secondaries white except for 

 the smoky dusky margin, which varies greatly, and nejjtis may be a 

 local variety in which the smok}^ tinge disappears altogether. 



Limitata is a good species with white secondaries, in which the 

 median vein is margined on the upper edge. 



Tetera is well marked by genital structure and by the tendency to 

 pink tinging in the costal and submedian regions of the primary. 



In tabular form the differences appear as follows: 



1. Primaries with the darker shadings pinkish red ruhripennis. 



Primaries with" the darker shading smoky or blackish 2 



2. Secondaries white at base, smoky toward and at outer margin 3 



Secondaries white 4 



Secondaries black albilinea. 



3. Size small, colors dark, secondaries translucent at base, smoky margin broad. 



obscurior. 

 Size larger, colors much lighter; secondaries white except for a smoky outer 

 margin, which is narrow or very narrow diffusa. 



4. Median vein white, with a brown margin on each side limilata. 



Median vein not obviously white, without dusky margin above 5 



5. Discal dot obvious; a pinkish shading on costa and in submedian interspace ..tetera. 

 Discal dot wanting or obscure; shadings reduced, even, not pinkish neptis. 



The group llgata is composed of three ver}^ closely allied species, 

 which agree in rather small size, somewhat frail body, close, some- 

 what scaly vestiture, and a slightly convex thorax, in which the collar 

 and patagifB are not well marked. The collar has a single transverse 

 line across the middle. 



The primaries have the costa and inner margin convex, the outer 

 margin oblique and somewhat rounded. A dusky median shade 

 extends from base to outer margin over the median vein, which is 

 partly white. This, with the small size and rather slight form, makes 

 the characteristic feature in the species. The transverse posterior 



