30 



The Uncus is strongly bifurcate with a rather narrow short neck 

 but with very stout forks which broaden apically giving a very char- 

 acteristic appearance; Mr. Pierce has figured the genitalia (Gen. Brit. 

 Geom. PI. 43) and specimens from North America which we have 

 examined agree well with his figure ; there is some slight variation in 

 the width of the neck which at times may be very narrow ; the depth of 

 the forks is also somewhat variable. 



On the East and West slopes of the central Sierra Nevada Mts. 

 (Verdi, Nevada; Cisco, Placer Co., Calif.) we meet with a race of 

 ruberata which has generally gone under the name similaris Hist, but 

 this name, as we have already had occasion to point out (Contr. Ill, 

 p. 176), has been erroneously applied. This race, (PI. V, Figs. 6, 9) 

 besides being somewhat smaller, is generally duller and more washed- 

 out in color, the whole of the primaries having a sufifused grayish 

 appearance without the sharp definition of the typical form ; the forks 

 of the Uncus (PI. IX, Fig. 7) are rather variable but in general are 

 less swollen apically than in Eastern specimens and show a tendency 

 to keep close together, making the open V quite narrow. We propose 

 for this race the name nevadae, our types being 7 S, 6 9 from 

 Verdi, Nevada (Jime), 2 5,3? Paratypes being in the American 

 Museum Collection. The race shows the same varietal tendencies 

 which we find in the nimotypical form. We have seen additional speci- 

 mens, rather better marked from Cisco, Placer Co., Calif. 



The two following species, glaucata Pack, and cdenata Swett, 

 have caused us a great deal of trouble with regard to their correct 

 identification owing to the fact that the Holotypes of both species are 

 9 's whilst the type of maculation is extraordinarily similar ; for a 

 considerable time we considered that the two names represented races 

 of a single species which extends more or less along the whole Pacific 

 Coast ; the recent receipt of a pair of specimens from the San Gabriel 

 Mts., Calif, in which the $ Uncus is of an entirely different type to 

 that of our so-called glaucata whilst the general maculation is astound- 

 ingly close has convinced us that we are certainly dealing with two 

 species, but has also left us in great doubt as to how to apply the 

 names correctly; our present usage is therefore more or less tentative 

 and caused by a desire not to augment the confusion already existing 

 by adding new names which may later prove to be synonyms; we 



