^^^ X0\-ITATES ZOOLOQIOAE XXV. 1918. 



Genus XXII. Eudioptis gen. nov. 



Like the following, but cell of hindwing considerably longer, M' well separate. 

 Palpus longer than in most Dioptis. 



1. otanes Druce, Proc. Zool. 8oc. Lond. 1893. p. 294 (Dioptis) (E. Ecuador). 



Genus XXIII. Dioptis. 



Dioptis Hb. {Ziitr. i. 9. indescr.). Verz. bek. Schmeit. p. 174 (1822 ?) (type njma Hb.). 

 Epilais Bdv., Lep. Guit. p. 78 (1870) (type cyma Hb.). 



Face appressed-scaled, usually rather i^romincnt. Eye moderate or rather 

 small. Palpus moderate or rather short, with appressed scaling. Antenna in 

 both sexes pectinate, the branches shorter in $. Pectus only slightly hairy. 

 Femora slightly rough-scaled. Abdomen rather slender. Wings subdiaphanous. 



Foreiving with cell one-half or rather less, DC long, moderately oblique, 

 DC'' slightly incurved ; SC""''" staged, R» before middle of DC, M' stalked! 



Hindwing rather elongate costally ; cell one-half or rather less, DC' ' rather 



oblique, not or only feebly biangulate ; C rather remote from SC, R' about 

 central, M' stalked. 



1. candelaria Druce, Biol. Centr. Amer., Lep. Het. i. 157. tab. 14. fig. 16 

 (1885) (Panama). 



= vacuata Warr., Nov. Zool. xii. 313 (1905) (Panama). 



-'. pellucida WaiT., Nov. Zool. viii. 438 (1901) (Colombia). 



3. phelina Feld., Reise Novara, Lep. Het. tab. 105. fig. 6 (1868) (Colombia). 

 = pandates Druce, Proc. Zool. Soc. Lond. 1893. p. 294 (Colombia). 



= impleta Warr., Nov. Zool. vii. 129 (1900) (Tithraustes) (Colombia). 



4. areolata Walk., List Lep. Ins. ii. 332 (1854) (Brazil). 



5. restricta Warr., Nov. Zool. viii. 439 (1901) (praec. form, i) (Brazil). 



= ? melda Bdv., Lep. Guat. p. 78 (1870) (Epilais) (Nicaragua ; ? Ecuador). 



The Tring Museum has a specimen labelled Huatu.xco, Vera Cruz, so closely 

 like the Brazilian form that I suspect an error in labelling ; if correct, it would 

 help to support the dubious determination of melda — though Boisduval's 

 localities, too, were often wrong. 



6. charila Druce, Proc. Zool. Soc. Lond. 1893. p. 292. tab. 20. fig. 1 (British 

 Guiana) . 



Similar forms occur in Venezuela, Colombia, and Ecuador. 



7. onega Bates, Tr. Linn. Soc. xxiii. 503, 565. tab. 55. fig. 12 (1862) 

 (Amazons). 



8. pallene Druce, Proc. Zool. Soc. Lond. 1893. p. 293. tab. 20. fig. 3 (Ecuador). 



9. stenothyris Prout, sp. nov.* (Rio Madeira). 



• Dioptis stenothyris sp. nov. <J $. 38-40 mm. Face white, with a brownish mark down 

 the middle. Palpus white beneath and at base. Wing-tegula «ith a largo orange spot. Thorax 

 and abdomen above brown-grey with a fine white dorsal line ; liejieath whitisli. 



Forewing dark brown-grey ; anteriorly to the cell white, witli tine grey irroration, SC remain- 

 ing clear white ; a hyaline longitudinal streak in posterior part <■{ cell ; a long hyaline-whitish 

 patch behind cell, broadly divided by dark lines on fold and SM» ; anteriorly tliis patch is bounded 

 by M and M-, distally it is irregularly bounded about 3 nun. from termen ; a very small white spot 

 in front of DC, a longer but less clear mark between M' and M' ; submarginal oblique white band 

 opaque, rather narrow (about 2 mm.), clear to R= with a small and slight, blurred extension behind 



it. Hindwing mostly hyaline whitish, with the veins and costal and distal margins dark ; distal 



of moderate width, containing from SC^ to S.M^ a narrow orange band. Underside similar, costal 

 margin of hindwing largely white. Humayta, Rio Madeira, July— September 1906 (W. Hoff- 

 manns). 2 cJcJ, 1 $ in coll. Tring Mus. 



