164 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxv. 



Oxygale is somewhat larger and broader winged than the previous 

 species, and has a grayish shading over the luteous base. The streak- 

 ings are very fine and not contrasthig, giving the whole insect a very 

 even appearance. The secondaries are entirely blackish except along 

 the costa, or there is only a narrow whitish edging along the outer 

 margin. 



The male genitalia are exactlv as in luteojxdlcns, but the leg tuft- 

 ings are even more marked than in tmnorata. In this species the 

 middle tibiae also are furnished with fringes outwardly, so that all 

 are now fringed. The range of this species is from the middle Rockies 

 southward, west to the Pacific coast, and throughout California. 



Ruhripallens difi^ers from all the other species in this group by the 

 reddish shading over the primaries. This is given by the reddish 

 streakings over the yellow base, the paler veins being thereby more 

 than usually relieved. The secondaries have a 3^ellowish tinge and 

 vary from this to a transparent smoky, the disk being always more 

 or less blackish. The range of this species is from the middle Kockies 

 into Utah, 



The genitalia of the male do not differ from those of I iiteojxillens 

 and the leg tuftings are very like those of oxygale. 



Pertracta Morrison belongs in this series, but I doubt its being an 

 American insect. The type is in the Strecker collection, and, while 

 the wings are perfect, the body is crushed as though it might have 

 been papered. The locality given on the label is "Pennsylvania," 

 and I have understood Dr. Strecker to say it came from a Philadel- 

 phia collector, whose name he did not give. 1 believe it to be an 

 unusually well-marked ixdlens.^ with a reddish tint, a little discolored 

 in the relaxing jar; in other words, a European specimen. Mr. Mor- 

 rison was in several cases misled as to the source of his specimens, 

 and I believe that in this case Dr. Strecker was also imposed upon. 

 I can scarcel}^ credit the occurrence near Philadelphia of a good 

 species so like pollens and so rare that in twenty-six 3^ears not a 

 specimen has been captured by any of the Philadelphia collectors. 



In tabular form the species of this group may be sei3arated as 

 follows: 

 Light creamy yellow, streakings not contrasting; secondaries with a small discal area 



blackish luteopallens. 



Darker, with a luteous tinge; streakings more obvious and somewhat contrasting; 



secondaries with more of disk blackish minorata. 



Pale grayish luteous; streakings not contrasting; secondaries all blackish except the 



margins oxygale. 



Reddish luteous, obviously streaky; secondaries with a yellowish tinge, smoky or 



blackish shaded rnbripallens. 



The group alhilhiea comprises another series of closely allied species 

 which rrnxj be separated out with a little care and a fair material to 

 work with. Superficially all the species agree in having the lower 



