232 JOHN B. SMITH. 



the average for the series being 24. The maciilation is practically 

 like that of olivacea, but somewhat less distinct. But there is no 

 mossy appearance, and no yellow or greenish powdering, all this 

 l)eing replaced by an obviously reddish shade. The terminal space 

 here is almost uniformly dark, whereas in olivacea it is only a little 

 if at all deeper than s. t. space, except in the female. These two 

 features give a different appearance to the series. The females are 

 much darker, with either very little contrast or with a rather well 

 marked though narrow paler s. t. space, and very sharply defined 

 dark terminal space. 



Three permanent mounts were made from this series, specimens 

 varying in appearance being selected. They agree with each other, 

 and differ from the previous series in having the base of the harpes 

 narrower, the tip less scoop-shaped, broader, and the inferior angle 

 of tip more prominently extended or drawn out. The claspers are 

 practically the same. The differences are slight, as are those in ap- 

 pearance. A geographical race rather than a well-developed species 

 is suggested, and this race — it isnot a variety — may be termed lucina. 



The third series consists of four males and thirteen females, re- 

 versing the proportions of the sexes found in the previous series. 

 With two exceptions these are all from Glenwood Springs, Colorado ; 

 the exceptions being one female from South Dakota — probably 

 Volga, and one female from Hot Springs, New Mexico, elevation 

 7000 feet. 



The specimens range from 24 to 26 mm., the greater number ex- 

 ceeding 25 mm. in expanse. There is no trace of mossy or yellow- 

 ish discoloration in any specimen, and there is only a feeble reddish 

 flush in the s. t. space inferiorly. This disappears entirely in some 

 examples— male as well as female. In the male the s. t. space is 

 gray except on the costa, not prominently contrasting, and the basal 

 space is only grey powdered ; the terminal space is usually darker. 

 In the female the contrasts are even less marked. The basal space 

 is hardly lightened, except along the course of the t. a. line, while 

 in some examples the s. t. space is almost concolorous above the 

 middle. There is no reddish shade in the basal spac^in either sex, 

 and the color in the s. t. space is a dead, dull, leathery shade rather 

 than a rosy tinge. 



Only one permanent mount was secured from this series, two of 

 the four males having lost abdomens in the transportation. I had. 



