412 Pr. A. G. Butlor on (he Butterflies 



tliougli some of these, being founded upon secondary sexual 

 characters, would be regarded perhaps as subgenera. Witli 

 the exception of Bhahdodryas (subsequently characterized) 

 I indicated the structural distinctions in my ' Monograph of 

 Callidryas.' 



Callidryas, Boisd. 



The following species are evidently seasonal phases : — 



Wet phase. Dry pliase. 



C. avellaneda, Herr.-Sch. C. solstitia, Butl. 



In C. tlialestris and C. j)hilea the seasonal phases are ill- 

 defined ; in G. for net X and editha we know only one phase. 



C. senncp, Linn. C. drya, Fabr. 



In my Monograph these two phases are figured side by 

 side on pi. vi., so that the differences can be readily seen. 

 The species ranges over South and Central America and the 

 West Indies. Of the nearly related (7. euhule, Linn., from 

 North America, the seasonal phases differ very slightly, if at 

 all, from each other. 



By several entomologists C. eulmle has been confounded 

 with C. sendee, but apart from its ill-defined summer and 

 winter phases, it is longer in wing and invariably sulphur- 

 yellow in both sexes. I should as soon think of uniting 

 C. tlialestris and philea as C. sennce and euhule. 



Paruea, Butler. 



Wet pbase. Intermediate pliase. Dry phase. 



P. ruriua, Feld. P. intermedia, Butl. P. virgo, Butl. 



In this species the phases are remarkably distinct, but in 

 the smaller P. hracteolata, Butl., neocypris, Hiibn., and 

 irrigota, Butl. (which are nearly related to each other) , the 

 dry phase seems to be characterized only by the much reduced 

 markings on the under surface. 



Rhabdodryas, Salv. & Godm. 



In the sole species (R. trite, Linn.) the black outer border 

 is obliterated in the dry phase, and the markings below are 

 all ill-defined or reduced in width. 



Phcebis, Hiibn. 



In P. agarithe, Boisd., the phases are not well-defined, but 

 the dry phase has the under-surface markings reduced ; there 



