MR. A. G-. BUTLER ON THE SPHINGHLE. 597 



Genus 17. Cequosa, Walker. 

 Crpquosa, Walker, Lep. Het. viii. p. 256. gen. 38 (1856). 



D i 3 CjSQUOSA TRIANGULARIS. 



Sphinx triangularis, Donovan, Ins. New Holl. pi. 33. fig. 2 (1805) . 



Acherontia triangularis, Boisduval, Voy. de F Astrolabe, Ent. p. 181. no. 1 (1832-35). 



Sphynx castaneus, Perry, Arcana or Mus. Nat. Hist. i. (1811). 



Ccequosa triangularis, Walker, Lep. Het. viii. p. 257. no. 1 (1856). 



Moreton Bay (Gibbons); Australia (Hunter). B.M. 



Subfamily V. ACHEKONTIIKdE. 



Genus Acherontia, Hubner. 

 Acherontia, Hubner, Verz. bek. Schmett. p. 139 (1816) . 



Ofl- ACHERONTIA STYX. 



Acherontia styx, Westwood, Cab. Orient. Ent. p. 88, pi. 42. fig. 3 (1847). 

 Acherontia atropos (part.), Walker, Lep. Het. viii. p. 234 (1856). 



North India (James) ; Turkey in Asia (Loftus). B.M. 



The larva is very pale green, or bright golden yellow, irrorated with black dots, with 

 lilac-bordered oblique white streaks; it has also a dark brown form. It feeds on 

 Paulownia imperialis. 



2. Acherontia medusa, ii. sp. (Plate XCII. fig. 10.) 



Acherontia medusa, De Cerisy, MS. 



Acherontia styx (part.), Moore, Cat. Lep. E.I. Comp. i. p. 267 (1857). 



Altogether darker than the preceding, and running to a larger size ; primaries above 

 without or with very indistinct longitudinal reddish streaks ; subapical paler area less 

 oblique, the intersecting transverse lines less strongly dentated ; secondaries with the 

 black bands, as a rule, closer together, better-defined, the inner one generally extending 

 to third subcostal branch ; body above darker, the scull-marking on thorax much darker, 

 and consequently rather less conspicuous ; head blacker ; abdomen with the dorsal blue 

 bar darker, the transverse bands blacker ; primaries below with the outer border much 

 more dusky ; secondaries with the outer band more dusky. Expanse of wings 3 inches 

 5 lines to 4 inches 10 lines (A. styx measures 3 inches 2 lines to 4 inches 5 lines). 



