LAWSON: KANSAS CICADELLID^. 49 



genus into the subgenera Agalliopsis, Agallia, and Acerata- 

 gallia. 



In the work on the internal genitalia of these forms, repre- 

 sentatives of each were examined, and it was found that in 

 these organs there are distinct differences between the mem- 

 bers of the three subgenera, and that in each subgenus these 

 organs, though differing specifically, are yet of the same gen- 

 eral type. Thus in Agallia novella, a member of the subgenus 

 Agalliopsis, the styles are each composed of two distinct 

 sclerites, a condition not found in any member of the other sub- 

 genera. The oedagus is also characteristic of the subgenus, 

 being much larger and with accessory lateral processes which 

 do not occur in the other subgenera. Moreover, it was found 

 that this species has, partially imbedded in the pygofers and 

 partially free, a very peculiar and characteristic chitinous 

 process corresponding to which there is nothing in the other 

 subgenera, 



Agallia constricta and Jf-punctata were then studied as types 

 of the subgenus Agallia. Here the styles were found to consist 

 of a single piece, and though distinctly and specifically different 

 in the two species, were yet of the same type, each being some- 

 what club-shaped and terminating in two blunt apical processes. 

 The oedagus also in each case was found to be of the same type 

 and vastly different from that of novella, having an enlarged 

 base and a long and curved terminal process. In constricta, 

 however, it is much stouter and heavier basally than in ^- 

 punctata. 



Agallia uhleri, sanguinolenta, and cinerea were next studied 

 as representatives of the subgenus Aceratagallia. The three 

 were found to agree in type of styles and oedagus which in the 

 case of both organs was entirely different from that found in 

 the other two subgenera. In this group the style consists of 

 a more or less club-shaped basal portion and a broad flat 

 terminal portion which has the mesal margin distinctly ser- 

 rate. But the styles of the three species, while of the same 

 type, are yet specifically distinct. Thus in sanguinolenta the 

 terminal portion is drawn out into a long lateral tooth, while 

 the style of uhleri, though much like it, lacks this lateral tooth. 

 The style of cinerea, on the other hand, has the mesal margin 

 strongly rounded apically, a condition not found in the other 



4— Sci. Bui.— 3058 



