1907.] BUTTERFLIES OF THE FAMILY LVaENIDiE. 629 



Thecla tucumana, sp. n. (Plate XXXYI. fig. 26.) 



Allied, to T. americensis Blanch.* 



Upper side differs in anal half of hind wing from base to 

 outer margin being pale violaceous blue, supporting three black 

 marginal spots between the nei-vules. Under side : spots and 

 markings much as in T. americensis, biit the whole of the hind 

 wing and the costal margin of the fore wing thickly mottled 

 with dark brown and grey scales, thus rendering the marking.s 

 very indistinct. 



Expanse iy^, inch. 



Rab. Tucuman, Argentine Republic (IF. Reeve). 



Type, Mvis. Druce. 



I cannot determine the sex of the specimen described, but I 

 believe it to be a female. 



Thecla cydia. 



ThecU cydia Hew. Ill.Diur. Lep., Lye. p. 160, pi. 63. figs. 433, 

 434 (1874). 



This insect is very close to T. cestri Reakt., and like it is tailless. 

 The male, however, 'difters from that sex of T. cestri in the hind 

 wing above being blue, as in the female. It is also a much 

 smaller insect. We possess several specimens from Paraguay, 

 and it is also in Mr. Godman's collection from the same locality 

 (W. Perrens). 



Thecla arcula, sp. n. (Plate XXXYI. fig. 27.) 



Male. Upper side : fore wing purplish black, browner towards 

 outer margin ; a large dark brand occupying the whole of the cell 

 excepting the extreme base. Hind wing : costal half dark 

 purplish brown, anal half from base to outer margin dark 

 violaceous blue, the blue running upwards along the margin to 

 the apex. Anal fold pale brown. Cilia of both wings dark 

 brown. Under side much like that of T. sapota Hew.f, but 

 ground-colour dark purplish brown. Fore wing with a clearly 

 defined whitish mark closing the cell and with the ultramedian 

 band more linear and straighter. Hind wing with an orange 

 spot at the anal angle, and an orange lunule crowning the 

 marginal black spot between the lower median nervules. 



Expanse \^ inch. 



Rah. Tucuman, Argentine Republic (IF. Reeve); Paraguay 

 {B.M., Crowley Bequest). 



Type, Mus. Druce. 



Four males not showing any variation. 



Like T. sajMta in the total absence of tails, but the brand is 

 quite different, being in that species merely a small patch at the 

 end of the cell. 



* Thecla americensis Blancli. Gay's Fauna Chili, vii. p. 38. 



t TJiecla sapota Hew. 111. Diur. Lep. p. 203, pi. 71. figs. 668, 669 (1877). 



