68 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxi. 



beak-like we get first paraUela and finally grisea, in which only the 

 beak-like process is developed. In connecta the clasper, while it 

 strongly resembles that of trifona, becomes interiorly united with the 

 sidepiece, the superior process becomes larger and more prominent, 

 and apparently arises much nearer the middle of the harpes. lufragi- 

 iifi and funeraUs there is a curious similarity in development. The 

 inferior portion of the clasper is somewhat flattened, united to the 

 liarpes except at the tip where it is freed, and has the inferior angle 

 prolonged. From these forms the transition into the hamnmelis type is 

 easy and rccjuires only tlie loss of the inferior process of the clasper. 



In this connection a study of the European |>.si, cuspu, and tridens is 

 interesting. None of them lack the superior process and none of them 

 have the scoop shaped clasper distinctly developed. Ciisjns is curi- 

 ously intermediate between JobcUae and persiiasa, while in alni we see 

 distinctly the structure which brings fuuiralis close to ajflieta, while 

 also indicating the tridcns derivation. Tridens is most nearly like 

 lithospila, while psi contains all the hamamcUti possibilities and those 

 of the group aurivoma. None of the species examined ))y me show 

 any resemblance to our grisea type, while on the otlier hand we have 

 nothing in the least resembling mcgacrphaUt. 



As we find thus, in the sexual structures, variations in several direc- 

 tions, so we find in the adults that from the strongly developed psi 

 type the macnlation tends to the strigate lithospila, to the dentate 

 fnigilis, to thei)Owdcry roughened siipcrans, and to the smooth, uniform, 

 cleanly defined type iu faleula, paralh-la, and allies. The same type of 

 maculation is duplicated in two or more divisions; hence any arrange- 

 ment on superticial api)earance will be certain to contradict that made 

 on structural characters merely. For convenience of determination, 

 superticial characters will be used in the table and in the revie^v of the 

 species. , 



While there is no absolute agreement, nevertheless as a whole the 

 members of this group have the epiphysis of the anterior tibia of the 

 male inserted at or above the middle, the lappet not reaching the tip 

 of the member, while the tarsi are i)roportionately longer. 



First of all we may separate innotata and bctiiJae as having no black 

 lines, streaks, or dagger marks of any description. The wings are a 

 little shorter and broader than usual, but the general scheme of macu- 

 lation is similar. Tnnoiata is white or yellowish, with the transverse 

 posterior line emphasized by black scales, while bctulae is of a peculiar 

 reddish clay or Inteous, without a trace of black anywhere. 



Morula, occidenialis, pKiiperciila, vinnnla, and frag His are united by 

 having a black streak at base, a dagger mark, which may or may not 

 cross the transverse posterior line, opposite the anal angle, and another, 

 much less marked, oj)iK)site the cell. The ordinaiy spots are not in 

 any way united or tied by a black line or liiark. The vestiture is smooth, 

 and the markings are not picked out by raiseil scales. Morula and 



