Proceedings of 

 the United States 

 National Museum 



SMITHSONIAN INSTITUTION • WASHINGTON, D.C. 



Volume 123 1967 Number 3611 



Butterflies of the New Genus Calystryma 

 (Lycaenidae: Theclinae, Stryinonini) 



By William D. Field 

 Associate Curator, Division of Lepidoptera 



Calystryma, new genus, contains 13 species, all of which are neo- 

 tropical in distribution. Six of the included species are herein 

 described as new and the rest are transferred to Calystryma from 

 Thecla Fabricius, where they have resided ever since they were first 

 described in spite of the fact that they belong to the Strymonini 

 (forewing having 3 radial veins) not to the Theclini (forewing having 

 2 radial veins). I designate as type of the genus: Calystryma blora, 

 new species. The name Calystryma is an arbitrary, euphonous com- 

 bination of letters and I consider it to be of the feminine gender. 



Calystryma is closely related to Calycopis Scudder, differing chiefly 

 in the form of the male and female genitalia. 



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

 elements that in lateral view are produced greatly near the middle, 

 thus differing from Calycopis. Vesica of aedeagus with a single spine- 

 like cornutus located at or near distal end of aedeagal shaft. Aedeagus 

 lacking the ventral keel found in some Strymonini and nearly straight 

 or sometimes upturned distally, with this end usually blunt, not 

 sharply pointed as in Calycopis. Harpes differing from those of 

 Calycopis in being separate along ventral margin, fused only at base 

 or in one case (C. keta) fused for nearly one-half their lengths from 

 base. This last species, however, has the Calystryma type of uncus 



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