66 AEROMACHUS. 



of the subcostal 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 upperside of the forewing. Type, " Thanaos " stigmata, 

 Moore. 



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

 species of A eromachus have hitherto been placed, is the "Papilio" tages of 

 Linnaeus, which occurs in Europe and Western Asia (Amurland, &c). 

 Thanaos is usually ranked as a synonym of Nisoniades, Hubner (1816), of 

 which the type is bromius, Stoll, a South American species, which is 

 probably not congeneric with tages. Aeromachus 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 T. tages has the costa folded over on the upperside ; the 

 differences in neuration too are considerable, in the forewing of T. tages the 

 first median nervule arises near the bases of the wing, in Aeromachus near 

 the lower end of the cell ; and the shape of the discoidal cell of the hind- 

 wing is quite different, in T. tages being square-ended, the disco-cellulars 

 being perfectly upright, and of equal length. 



The genus Aeromachus is, as far as I know, strictly confined to India, 

 where it occurs all along the Himalayas, in Assam, Burma, and again in 

 the hills of South India. They rest with wings closed over the back." 

 (de Niceville, I. c.) 



90.-AEROMACHUS 1NDISTINCTA, MOORE. 



Thanaos indistincta, Moore, P. Z. S., 1878, p. 694. 



Aeromachus indistincta t de Niceville, Journal Bomb. Nat. Hist. Soc., 

 vol. v, p. 216 (1890). 



" Upperside uniform olive-brown ; cilia edged with cinereous. 



Underside forewing with a very indistinct grey-speckled submarginal 

 and marginal line : hindwing with indistinct grey-speckled veins, basal 

 interspaces, and two outer indistinct lunular bands. Palpi and body 

 greyish-white beneath. 



