DRUSILLA. THAUMANTIS. 



335 



length of the anterior. Posterior margin as long as the apical ; dilated at the base in the males, with an 

 emargination in the middle ; nearly straight in the females. Veins arranged as in Cleromc. The second branch 

 of the postcostal vein arising at about two thirds of tlie length of the wing ; the third and fourth brandies 

 arising at a little distance bej'ond the second. Submedian vein very much curved in the male, being parallel 

 with the inner mai'gin of the wing. 



Hind Wings nearly circular, the portion between the anal margin and the middle of the wing beino- so mucli 

 widened that the veins and branches are here dispropoi-tionately wide apart. On the disc" of tliese winos, 

 near the base, but concealed by the dilated lobe of the fore wings, there exists, in the male, a tuft of hairs ; 

 there is also an elongated tuft near the inner margin, opposite to the extremity of the abdomen. Veins 

 arranged as in Clerome. 



t'ore Legs of the male very minute, hairy, but not forming a brush. Tarsus extremely short, oval, cxarticulate. 

 Fore Legs of tlie female more than twice as long as those of the male, thick, scaly. The tarsus two tliirds of the 

 length of the tibia, strong, well articulated, but the articulations not seen except by denuding tlie limb. Tlie 

 tips of the joints within armed with small spines, those of the third and fourth joints alone visible through the 

 scales. 



Four Hind Legs long and strong, scaly, very slightly spined on the under side of the tibia and tarsus. 

 Tibia as long as the femur. Tibial spurs very minute. Tarsus as long as the tibia. 

 Abdomen moderately robust. 



Transformations unknown. 



The insects of this genus are closely allied to Clerome, agreeing therewith in the Oriental habitat, dull colouring, and the veins of the 

 wings of the species ; but differing especially in the elongated form of the fore wings, and the large and striking eyelike spots with 

 which the hind wings are ornamented, one of which is alone visible on the upper side, as re]>reseuted in our Plate LIV. f. 4. ; but on 

 the under siile there is a second eye near the outer angle, and on this side the eyes are greatly enlarged in size. In two fine species 

 from the islands of the Eastern Ocean, in the collection of M. Boisduval, the eyes arc visible o'l both sides of the wings. 



A specimen of Drusilla Horsficldii, in the collection of W. W. Saunders, Esq., offers an instructive peculiarity in respect to the arrange- 

 ment of the branches of the veins of the fore wings, showing, by the irregularity whicli exists in one of the wings, how branches may 

 become coalesced: the right-hand fore wing has the second and third branches of the postcostal vein free; but in the left-hand wing 

 there is no second branch, but near the middle of the third branch, on the side next the base of the wing, there is a little oifset, or 

 veinlet, running from this third branch to the costa, and which is unquestionably the relic of the real second branch, which may 

 therefore be considered as having coalesced with the postcostal vein, and partially with the third branch. This malformation also 

 teaches us, that where branches throw off branchlets we may expect some departure from the normal type to have taken place, and that 

 two branches have coalesced to a greater or less extent. 



DRUSILLA. 



1. DrUS. HoRSFIELnil. 



Drusilla Horsfieldii Su-ainson, Zocl. Ilhistr. 1st series, t. 



11. ; Douhl. Tfestw. S^ HewUs. Gen. Diirni. Leji. pi. 51. 



f. 4. 

 Hyades Horsfieldii Boisduval, Spec. Gen. Ins. Lep. pi. 13. 



(9B.) f. 1. 

 Morpho Urania Zinben-Sommer in A'boa Acta, xv. p. 



U)7. 

 Java. B. M. 



2. Drus. Urania. 



Papilio Urania Linnaus, Mus. Lud, Ulr. p. 225., Syst. 



Nat. ii. p. 756. ; Fahricrus, Ent. Syst. in. pt. 1. p. 



166. n. 512. 

 Papilio .Jairus Fahricius, Gen. Ins. Mant. p. 258., Ent. 



Syst. III. pt. ]. p. 54. n. l68. ; Cramer, Pap.[^\. 6. f. 



A. B., pi. 185. f. A. B. C. ; Godart, Enc. M. ix. p. 



445. (Morpho J.) ; Boisduval, Voy. de F Astrolabe, 



Entomol. pt. 1. p. 157.; Donovan, Ins. of Chum, pL 



33. f. 1, 2. 

 Tenaris Nysa Hiibner, Verz. belt. Schm. n. 493. 

 Papilio Cassise Clercle, Icones, t. 29. f. 3. 

 Amboyna, Ravvak, New Guinea. 



3. Drus. CATors nov. sp.* 



Hyades C'atops Boisduval MS. 

 New Ireland. 



4. Drus. Selene nov. sp.t 



Hyades Selene Boisduval MS. 

 New Guinea. 



Mus. Bdv. 



Mus. Bdv. 



Genus III. THAUMANTIS. 



TiiAUMANTis Iliilmer, E. Doubleday, Boisduval. 

 Morpho p. GodK Ilorsjield, Zink. g. Sommer. 



Body elongate, rather robust ; wings large, rounded, generally glossed with ricli blue or purple, marked beneath with 



large ocelli. 

 Head large, hairy, with a small frontal tuft. 



* Drusilla alls albis, anticarum costa apiceque late fuscis ; posticis albis, basi pallide fulvescenti, angulo extenio fusco, ocellisque duobus supra distinctis. 

 t Drusilla, D. Urania? major et multo pallidior ; alls anticis foeniinse albo magis distincto, ocellisque posticarum maxirais et supra distinctis. 

 January 1. 1851. 4 T 



