MR. A. G. BUTLER ON THE SPHINGIDZA. 597 
Genus 17. Caquosa, Walker. 
Cequosa, Walker, Lep. Het. viii. p. 256. gen. 38 (1856). 
CHQUOSA TRIANGULARIS. 
Sphinz triangularis, Donovan, Ins. New Holl. pl. 33. fig. 2 (1805). 
Acherontia triangularis, Boisduval, Voy. de l Astrolabe, Ent. p. 181. no. 1 (1832-35). 
Sphynx castaneus, Perry, Arcana or Mus. Nat. Hist. i. (1811). 
Cequosa triangularis, Walker, Lep. Het. viii. p. 257. no. 1 (1856). 
Moreton Bay (Gibbons); Australia (Hunter). B.M. 
Subfamily V. ACHERONTIIN &. 
Genus ACHERONTIA, Hiibner. 
Acherontia, Hubner, Verz. bek. Schmett. p. 139 (1816). 
1, ACHERONTIA STYX. 
Acherontia styx, Westwood, Cab. Orient. Ent. p. 88, pl. 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, n. 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. stya measures 3 inches 2 lines to 4 inches 0 lines). 
