NO. 1283. REVISION OF SOME NOCTVID MOTHS— SMITH. 169 



defined dusky shade accompanying it inf eriorly. There may be a darlv 

 or black basal streak, but this extends into the interspace and not 

 along the vein. There is no black discal dot, though in some examples 

 a few black scales help to define the white dot inwardly. The puncti- 

 forni transverse posterior line is complete and sometimes tends to 

 become geminate. 



The legs in the males of this group have the sexual tuftings best 

 developed in lieterodoxa. The anterior femora are fringed beneath 

 with long dense hair, about as long at base as at tip, and forming no 

 tufts; the tibias are not modified. The middle femora are fringed for 

 their entire length, but the hair at base is very much longer than that 

 at tip; the tibite are outwardly clothed with very dense hair, thickest 

 at the middle, but forming no expansible tufts. The posterior femora 

 have a thin, moderate fringing at base only; the tibia? have a small 

 fringing of hair outwardly. 



In dki the development is about the same; in uiHuda it is not quite 

 so well marked, and in megadia it is so reduced that there is not much 

 difference between the sexes. 



The genital structure is similar in type in all the species; but no 

 two are quite alike. The harpes at about the middle are suddenly 

 constricted from below and continued along the superior margin into 

 a more or less long-oval tip. There may be one, two, or half a dozen 

 long bristle-like hairs at the edges of this tip. The clasper is made up 

 of two parts; a flat long plate, the margins rolled over on the upper 

 edge, and at tip the upper angle is drawn out into a sharp curved hook. 

 From this plate arises a long, cylindrical finger-like process directed 

 obliquely upward and outward and extending well beyond the upper 

 margin of the harpes. 



Onl}^ in dia are the lateral bristles of the male antenna? in the least 

 marked. 



Dla is the smallest of the species, the veins all white marked and no 

 obvious black markings anywhere in the wing. The species is from 

 California. 



Megadia is somewhat larger, much better marked, the dark shad- 

 ings obvious; a black or blackish curved basal streak extending into 

 the submedian interspace. It extends along the mountain ranges from 

 Arizona into British America. 



Heterodoxa is again larger, markings fully as obvious as in the pre- 

 ceding; but there is no curved basal dash and the punctiform transverse 

 posterior line is more obvious. The male genitalia also show an 

 obvious difi'erence as compared with those of the preceding two forms 

 and resemble more nearly the following. It extends throughout the 

 northern United States to the Pacific coast. 



Insueta is perhaps a little larger on an average than heterodoxa,, and 

 decidedly reddish in color, varying somewhat, however, on this point. 



