G6 BULLETIN 48, UNITED STATES NATIONAL MUSEUM. 



Tliis genus is an extremely interesting one. There are a number of 

 species, and wiiile they belong together, without doubt, tliere is a con- 

 siderable amount of variation. In all, hoAvever, the peculiarity of the 

 male antenna is marked, and in general the wing form is similar. In 

 the i)alpi there is a great range of variation, and while the type found 

 in Herminia is controlling, yet in H. centralis the u])right scales are 

 not prominent, and we get a form dangerously like Tetanolita, which 

 this species also resembles in color, in markings, and to some extent 

 in wing form, fn R. .salusalis [hreviostralis) a sexual peculiarity is 

 found in the nuile in the form of a truncated tuft or brush of hairlike 

 scales on the ui»i>er and inner side. The structure of the nuile fore leg 

 is i)ractically alike in all the species. Coxa, trochanter, and fenuir are 

 normal, or nearly so; the tibia is short, but produced into a long 

 process anteriorly, without covering any tufts or pencils of hair, and 

 therefore correspondingly narrow. 



All the described species are known to me, and 1 have found two 

 others not yet characterized among the material before me. R. salusalis, 

 better known as R. breiurostralis, differs at once from all the other 

 species by the short palpi of the male, which also have a truncated 

 tuft of hair on the upper side of the middle joint, and have the terminal 

 joint short, the entire member oblique. The primaries are distinctly 

 pointed at the apex, and the outer margin is oblique and long. In 

 color the male is i)ale hiteous, and the ordinary lines are punctiform 

 or crenulated. 



The remainder of the species have the pali)i longer in both sexes, 

 without special moditication in the male, and they separate into two 

 distinct series on the character of the transverse posterior line, as 

 pointed out by Mr. Grote. In the majority of the species it is irregnlar, 

 dentate, crenulate, punctiform, or otherwise marked 5 but in two species, 

 R.jlavipunctalis and R. i)ulverosalis. it is even, pale, and preceded by 

 a more or less marked, also even, dusky line. 



Of the first series, R. discoloralis' in much the largest, exceeding in 

 size indeed all oth<n\s of the genus, and is thus recognizable by that 

 character alone. It is also much the most variable, rivaling Zanclog- 

 vafJia hcrif/ata in its protean changes, and we find every gradation from 

 a uniform tint, in which none of the markings are traceable, to a strongly 

 contrasting type, in which all the lines are prominent and all the spaces 

 discolorous. A prominent feature is found in the nearly continuous 

 subternunal line, marked by both a preceding and a following darker 

 shading in most instances. 



The other species of this section are decidedly smaller, never varia- 

 ble, and again divided on wing form. R. fraicrnulls, R. sohrialis, and 

 R. lar rails have longer, more i>ointed fore wings, the apex marked, the 

 outer margin quite oblique and with a little tendency to incurve below 

 the ti[) of the wing. R. clifosalis and R.factiosalis have the fore wings 



