470 NORTH AMERICAN NOCTUID^ SMITH. 



coarse, mixed. Palpi well developed, reaching to middle of front. 

 Second joint, club shaped; third distinct, cylindrical. On the under 

 side of primaries the cell is clothed with long silky hair, somewhat 

 more dense in the males, and in some species forming brushes or tufts 

 in that sex. The antennae are simple in both sexes. 



From Tamiocampa this genus is distinct by the wing shape, which is 

 characteristic, by the silky hair on cell beneath, and by the longer, 

 better developed palpi. Some of the species have been heretofore 

 classed as Tceniocampa, and the genera are very closely related. 



Injirma and cijnica differ from all others by having the clasper of the 

 male geuitalia double, and superficially by the pale ringed ordinary 

 spots, the orbicular being large and oblique. Injirma is easily distin- 

 guished by a triangular black spot at the middle of the collar, the two 

 lobes of which are interiorly separated. The median lines* too, are nar- 

 row and pale, while the ground color is rather a dark mouse gray. 

 Cynica is more reddish, and the median lines are irregular and black ; 

 the males have a very distinct tuft of appressed hair beneath. 



The remaining species never have the ordinary spots pale ringed; 

 the orbicular is often obsolete, and the reniform rarely distinctly de- 

 fined. The median lines are often more or less obsolete, while the s. t. 

 line is always marked. 



Vecors, or enervis (why Guenee changed the name I do not know), 

 is usually red brown, witli fairly evident median lines, obsolete orbicu- 

 lar and usually white marked reniform. The s. t. line is usually marked 

 only by an irregular dusky shade, which is often interrupted. The 

 species is decidedly variable, and yet not easily confounded with any 

 other. 



Virgula is similar, but is a more slender species. The median lines 

 when visible are dark, and very strongly and irregularly dentate. The 

 s. t. line is characteristic, and is marked only by a series of sagittate 

 dashes, one of which usually crosses the s. t. space. It is a sordid 

 dark, blackish-brown species, in which the ordinary spots are rarely 

 traceable and never clearly defined. 



Irrorata is a brown-red species, sprinkled with coarse black atoms, 

 the median lines distinct, accompanied by broad luteous shades. S. t. 

 line pale, diffuse, preceded by a dark shade. 



The three preceding forms agree in essential gentital structure. The 

 harpes are more or less obliquely terminated, and the clasper is hol- 

 lowed out or somewhat spoon-shaped ; in virgula and irrorata moder- 

 ate in size, iu enervis curiously exaggerated. 



Puerilis differs from all others by the pale luteous color, the clean 

 white reniform, and distinct white s. t. line. The male genitalia are 

 also peculiar, the harpes being very peculiarly terminated, while the 

 clasper is single, hook-like, acute. The genitalia of all the species are 

 hereafter more particularly described. 



