PROF. J. O. WESTWOOD ON THE URANIIDZ. 521 
B. (Sematuride Guenée.) Fore wings with the upper discoidal vein (65) arising at a short dis- 
tance beyond the discoidal cell, between the cell and the origin of the second branch of the 
subcostal vein (4 2). ; 
a. Discoidal cell of the hind wings terminating at a distance before the emission of the first branch 
of the median vein.—Gen, Manrpra, Westw.; type U. lunus (figs. 10-12). 
b. Discoidal cell of the hind wings extending nearly to the emission of the third branch of the 
median vein.—Gen. Coronip1a, Westw.; type U. orithea (figs. 1-9). 
Genus 1. Uranipia, Westw. 
(Details, Plate LXXXV. figs. 13, 14.) 
Urania (pars) Fabricius, in Illig. Mag. vi.; Hiibner, Verz. ; Latreille. 
Cydimon (pars ult.) Dalman (1824), Kongl. Vet. Acad. p. 392. 
Cydimon Guenée, Felder, Blanchard, Boisduval, Rev. Zool. 1874, p. 10. 
Urania (pars prior), Walker, List B.M. Lep. Het. p. 4. 
Leilus (pars), Swainson, Zool. Ill. n. ser. pl. 129. 
The species of this genus are remarkable for the habit of migrating in large numbers, 
as described by Mr. MacLeay in his paper in the Society’s ‘Transactions.’ Such flights 
of U. leilus are also described in ‘ Nature,’ iv. pp. 12, 13, 494; and the annual migrations 
of U. fulgens from east to west in August and September, across the Isthmus of Panama, 
are described in the same journal (‘ Nature,’ viii. p. 536). 
Sp. 1. URANIDIA LEILUs. 
Papilio leilus, Linn. 8. N. ii. 750; Clerck, Icon. pl. 27. f.1; Cramer, Pap. Exot. i. pl. 85. f. C, D; 
Fabricius, Syst. Gloss. (Urania, L.) ; Guenée, Sp. Gén. ix. p. 7; Boisduval, Rev. Zool. 1874, 
p. 10 (Cydimon, L.). 
Lars heroica leilaria, Hibner, Sammi. ex. Schm. (L. B. heroice), pl. a. f. 1, 2. 
Leilus surinamensis, Swainson, Zool. Ill. 2nd ser. pl. 125. 
Hab. Cayenne, Surinam. 
Sp. 2. URANIDIA AMPHIELUS. 
Cydemon amphielus, Boisduval, Rev. Zool. 1874, p. 11. 
Cydimon leilus, var., Guenée, Sp. Gén. ix. p. 7. 
Hab. Trinidad. 
Sp. 3. URANIDIA BRASILIENSIS. 
Leilus brasiliensis, Swainson, Zool. Ill. 2nd ser. pl. 126; Guenée, Sp. Gén. ix. p. 7, pl. 1. f. 1. 
Hab. Brazil. 
Sp. 4. URANIDIA CACICA. 
Cydimon cacica, Guenée, Sp. Gén. ix. p. 8; Boisduval, Rey. Zool. 1874, p. 11, 
Hab. Mexico, Acapulco. 
