166 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxv. 



The male genitalia are of the characteristic form, with all the pro- 

 cesses well developed. 



This form has a wide distribution, ranging in ni}" material from 

 southern Arizona to New Jerse}'. 



Ohscurlor resembles the preceding in size and in the dark color of 

 the primaries; but the maculation is more even and the discal spots 

 are absent. The secondaries are whitish to the middle or ])eyond, the 

 margin diffusely smoky. 



The genital structure is like the preceding and the form may be 

 only a local variet}'. But it comes from Manitoba, and I have found 

 this faunal region so well marked that I risk the name, based chiefly 

 on the more even color of the primaries and the partially white 

 secondaries. 



Diffusa is a markedly lighter colored and larger species, the second- 

 aries white, with a diffuse smok}'^ outer margin varying in width. 

 The dark areas of the primaries are much smaller and much better 

 defined, the terminal space tending to become leaden gray. There 

 is no difficulty at all in separating out this form from both of the 

 preceding. 



The male genitalia are distinctive chiefl}" b}^ having the superior 

 process short, blunt, and cylindrical, like a thumb, while the lower 

 process is quite flattened. There are other differences in detail which 

 may be better understood by a reference to the figures herewith given. 



This is the most widely distributed form. Walker's tj^pe, coming 

 from Nova Scotia, while Mr. Druce figures a specimen as coming from 

 near e City of Mexico. 



The other species in this group agree in having the secondaries 

 entirely white. 



Liinitata is from Texas and has the brown shading to the white 

 median vein on both sides of it — that is, there is a narrow brown 

 shading that begins near the base of the cell itself, margins the ^•ein 

 on each side, and, beyond it, continues into the brown subapical shade. 



The male genitalia have the superior process flat and squarely 

 terminated, the inferior more obviously spoon-shaped than in the 

 other species. 



Tetera differs from the preceding in that the median vein is not obvi- 

 ously whitish, and there is no dusk}" shade above the median vein. 

 The dusky shadings are well marked, but a pinkish shading is intro- 

 duced along the costa and in the submedian interspace. The discal 

 spot is marked in all the specimens, and is also present in the preceding 

 species. 



In the male genitalia the species is the most al)errant of the group. 

 The upper process of clasper is altogether lacking; the lower process 

 is cylindrical, finger-like, and the middle hook is only moderate in 

 length, a little curved and pointed at tip. The tip of the harpes is 



