Proceedings of 

 the United States 

 National Museum 



SMITHSONIAN INSTITUTION • WASHINGTON, D.C. 



PRELIMINARY REVISION OF BUTTERFLIES 



OF THE GENUS CALYCOPIS SCUDDER 



(LYCAENIDAE: THECLINAE) 



By William D. Field 



Associate Curator^ Department of Entomology 



The genus of butterflies treated in this paper contains 21 species, 

 of which 6 are here described as new. Nineteen of these species are 

 neotropical in distribution; one species is entirely nearctic and one is 

 both nearctic and neotropical. 



In Calycopis the fore wings of the males lack scent pads. Upper 

 surfaces of hindwings have some blue or purplish scales and sometimes 

 these Avings are almost entirely blue or purplish. Hindwings with 

 tails at end of veins Cui and Cu2, the tail at end of Cua being much the 

 longest. Undersurface of hindwing with a submarginal oceUate spot 

 below vein Cui and sometimes with one or more of these spots above 

 this vein. The area between the large blue lunule in interspace Cu2 

 and the postmedian line is always darker than the ground color and is 

 usually some shade of red. 



In the male genitalia the uncus is divided dorsaUy into two lateral 

 elements, often completely separated. Aedeagus usually with a 

 single terminal, spinelike cornutus, very rarely with a small second 



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