GENUS GRAPTA 173 



The underside of hind wings is highly variegated, the lighter 

 outer parts contrasting sharply with the darker base, and with 

 small spots of green near margin, and it is in this point that one 

 difference between it and the next species, lies. 



2x6. Grapta Rusticus. 



Plate XXII ; Figure 216. 



Fig. 216, Female, underside, Portland, Oregon, May, 

 1892 ; Author. 

 The upper side of Rusticus is very similar to Faunus ; the un- 

 derside is less variegated than Faunus, with less light color on the 

 outer part of margin of the wing, and less contrasty. 



This butterfly is very rare, and I have found it a diflitult one to 

 capture, when at length one is discovered. 



217. Grapta Silvius. 



No figure. 

 Silvius was named from one example, bred from the larva of 

 Rusticus, and was supposed to be an aberrant form, and not a dis- 

 tinct species, and never should have been put in the catalogues as 

 a species. It is scarcely necessary to speak at length on such a 

 specimen, and it is only mentioned here to account for the name 

 as it appears in the catalogues. Students will find the text, what 

 little there is of it, in Edwards' Butt. N. A., 2, VIII, 1879, after 

 text of Rusticus. 



218. Grapta Zephyrus. 

 Plate XXII ; Figure 218. 



Fig. 218, Female, underside, Truckee, Cal., July i, 1893; 

 Author. 

 Zephyrus and the following, Gracilis, are similar in many as- 

 pects, and they are put side by side here for the comparison of the 

 main points of difference, which you will find on the under side, as 

 figured on the plate. There is no appreciable difference on the 

 upper side. 



219. Grapta Gracilis. 



Plate XXII; Figure 219. 



Fig. 219, Female, underside, Tacoma, June, 1889 ; Author. 



Gracilis has the underside of a bluish tint, and the silver C is 



larger than in Zephyrus. The wings of Gracilis appear more 



deeply concaved than Zephyrus, but the two forms are very much 



