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KANSAS UNIVERSITY QUARTERLY, 



the Other two; or both the original fingers send out shoots from their 

 bases so that there are four fingers. The proximal portion of the 



Fig. 1-. 

 Scales irciiu i-iugle forewiug of Gloveria arizonensiR. 

 scale is shortening all the time and the space between the pedicel and 

 the bases of the fingers is widening. The number of fingers may 

 increase to seven or eight, and the proximal portion of the scale 

 become so short that the fingers are twice as long as the short, broad, 

 blade portion. In Tolyf^c the fingers may be three times as long as 

 the uncleft portion of the scale. This line of specialization is 

 illustrated in figure 12, a series of scales from Gloveria arizciicnsis. 



Still another line of specialization is exhibited by the scales of 

 Helicon/a. The rather stout, not long, scale-hair appears next to be 

 cleft almost to its base, the two fingers stiffly diverging. Then begins 

 a widening and slight shortening of the fingers, the union of their 

 inner margins proceeding farther and farther from the base, till there 

 results a rather ovate scale with an angular emargination and two short, 

 broad, acute-angled teeth on its outer margin. I have not been able to 

 observe forms between the single-pointed scale-hair and the deeply cleft 

 form shown as the second scale in the figure. As these generalized 



