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II. On a new and remarkable species of Attacus. 

 By W. H. MiSKiN. 



[Read 5th January, 1876.] 



The folloAving description of what, I believe, to be a 

 unique and extraordinary form of this genus of moths will 

 probably be read with interest. 



Attacus Hercules, n. sp. 



Ferruginous. 



Male. — Antennge tawny, nearly a fourth as long again as 

 thorax, exceedingly deeply and perfectly bipectinate, the 

 branches in pairs of equal length. Thorax and abdomen 

 same colour as wings, the latter with white band at base. 



Fore wing. — Costa considerably convex apically, fal- 

 cate, nearly square at apical angle ; outer margin concave ; 

 posterior angle rounded ; semi-hyaline narrow discal band, 

 bordered inwardly with black, nearly straight, but arched 

 when touching the costa; vitreous triangular discal spot 

 attenuated, base rounded, point not touching the band, 

 lined round narrowly with white, and again surrounded by 

 a narrow band of black, which, on the side parallel with 

 the base, is broad and crescent-shaped ; some distance 

 beyond this, towards the base of the wing, is a cor- 

 responding arch of white ; a narrow basal transverse band 

 of white runs angularly towards the base from median 

 vein to abdominal margin ; a rosy patch in apical angle. 



Hind wing. — Long tail ; abdominal margin perfectly 

 straight, from a little beloAv extremity of abdomen to about 

 three-fourths the length of taU, where it slightly dilates, 

 then abruptly diverging at an obtuse angle, until it meets 

 extremity of outer margin (which is somewhat curved 

 from a little above the elbow), forms a long, acutely- 

 pointed angle ; main branch of median nervure not con- 

 tinued down the tail (as in Tropcea), but terminating on 

 outer margin a little before the tail ; there are consequently 

 but three nervures contained therein : the submedian 

 reaching a httle below the elbow, the second median 

 branch only reaching to the extreme point, the third in- 

 termediate ; basal part of abdominal margin excavated ; 



TRANS. ENT. SOC. 1876. — PART I. (mAY.) 



