NEW AND LITTLE KNOWN BUTTERFLIES. 215 



with the middle, inwardly oblique ; the median nervules with their 

 loses equi-distant, given off very near to the end of the cell, the third 

 median originating at the point where the lower disco-cellular nervule 

 meets the median nervure ; the median Horn re strongly bent upwards 

 from the base of the second median nervule ; submedian nervure straight. 

 Male (in the type species only) with a broad oblique stripe of modified 

 scales on the upperside extending from the middle of the submedian 

 nervure to the base of the second median nervule. Hindwing, much 

 rounded throughout ; costa short ; costal nervure almost straight, first 

 subcostal nervule bent upwards at base, thence straight to apex of wing; 

 subcostal nervure strongly bent down wards bet ween the bases of the sub- 

 costal nervules, giving the appearance of a third (or upper) disco - 

 cellular nervule, the subcostal nervure and its branches together 

 forming a figure of almost the exact shape of a tuning-fork ; disco- 

 cellular nervules outwardly oblique, the upper concave, the lower 

 shorter than the upper ; the discoidal nervule curved, and, like 

 the disco- cellular nervules, very fine but perfectly distinct ; second 

 median nervule given off some little distance before the lower 

 end of the discoidal cell, more than twice as far from the base 

 of the first as it is from the base of the third median, all three 

 median nervules, however, arising near to the lower end of the cell ; 

 submedian and internal nervures straight. Antenna exactly half the 

 length of the costa of the forewing, with a well-formed club, the tip 

 slightly hooked; thorax rather slender, abdomen very slender. Female 

 differs from the male in having the wings broader and more rounded, 

 and lacks in the type species the patch of androconia on the upper- 

 side of the forewing. Type, "Thanaos" stigmata, Moore. 



The type of the genus Thanaos of Boisduval (1832-33), in which all 

 the species of Aeromachus have hitherto been placed, is the " Papi- 

 lio" tages of Linnaeus, which occurs in Europe and Western Asia 

 ( Amurland, &c). Thanaos is usually ranked as a synonym of Nisoniades, 

 H'ubner (1816), of which the type is bromius, Stoll, a South Ameri- 

 can species, which is probably not congeneric with tages. A'eroma- 

 chus differs from T. tages in the shape of the wings, especially in 

 the hindwing, which in that species is altogether much larger, and 

 has the costa almost straight and very much longer, thus giving 

 quite a different outline to the wing; the forewing of the male of 



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