PROF. J. O. WESTWOOD ON THE UEANIID^. 521 



B. {SematuridtE Guenee.) Fore wings with the upper discoidal vein {b 5 *) arising at a short dis- 

 tance beyond the discoidal cell, between the cell and the origin of the second branch of the 

 subcostal vein (62). 



a. Discoidal cell of the hind wings terminating at a distance before the emission of the first brancn 



of the median vein. — Gen. Manidia, 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. Coroxidia, Westw.; type U. orithea (figs. 1-9). 



Genus 1. Uraxidia, "Westw. 

 (Details, Plate LXXXV. figs. 13, 14.) 



Urania (pars) Fabricius, ia lUig. Mag. vi. ; Hiibner, Verz. ; LatreiUe. 

 Cydimon (pars ult.) Dalman (1824), Kongl. Vet. Acad. p. 392. 

 Cydimon Guenee, Felder, Blanchard, Boisduval, Rev. Zool. 1874, p. 10. 

 Urania (pars prior). Walker, List B.M. Lep. Het. p. 4. 

 Leilus (pars), Swainson, Zool. 111. n. ser. pi. 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. llEAjyiDIA LEILUS. 



Papilio leilus, Linn. S. N. ii. 750; Clerck, Icon. pi. 27. f. 1; Cramer, Pap. Exot. i. pi. 85. f. C, D; 



Fabricius, Syst. Gloss. {Urania, L.) ; Guenee, Sp. Gen. ix. p. 7; Boisduval, Rev. Zool. 1874, 



p. 10 {Cydimon, L.). 

 Lars heroica leilaria, Hiibner, Samml. ex. Schm. {L. B. heroica), pi. a. f. 1, 2. 

 Leilus surinamensis , Swainson, Zool. 111. 2nd ser. pi. 125. 



Hob. Cayenne, Surinam. 



Sp. 2. URANIDL4 AMPHIELUS. 



Cydemon amphielus, Boisduval, Rev. Zool. 1874, p. 1 1. 

 Cydimon leilus, var., Guenee, Sp. Gen. ix. p. 7. 



Hob. Trinidad. 



Sp. -3. Uranidia beasiliensis. 

 Leilus brasiliensis, Swainson, Zool. 111. 2nd ser. pi. 126; Guenee, Sp. Gen. is. p. 7, pi. 1. f. 1. 

 Hab. Brazil. 



Sp. 4. Uranidia cacica. 

 Cydimon cacica, Guenee, Sp. Gen. ix. p. 8; Boisduval, Rev. Zool. 1874, p. 11. 

 Hab. Mexico, Acapulco. 



