THAIS. 



31 



THAIS Fab. 



Th. Hvpsipyle Godt. Eric. 31. ix. 82. n. 2. (1819). 

 Boisd. Sp. Gen. i. 884. n. 2. (1836). 

 P. Hyp. Fab. Spec. Ins. n. 95. n. 417. (17S7)- 

 P. Rumina Espcr, Europ. Schmett. t. 15. f. 1. 



(1777-1805). 

 P. Hyperranestra Scopoli, Ent. Cam. 149- "• 125. 



(1763) non Linnaei. 

 P. Aristolochia? Borkh. Pap. Europ. 1. 113. n. 



250. (17S8). 

 P. Polyxena Herbst. Pap. t. 250. f. 1, 2. (1783- 

 1804). 

 Hiibn. Europ. Schmett. Pap. f. 392, 393. 

 (1806-27). 

 Var. P. Cassandra Hiibn. Europ. Schmett. Pap. 



f. 392, 393. (1806-27). 

 Th. Cass. Boisd. Sj]. Gin. 1. 386. n. 3. (1836). 

 S. Europe. B. M. 



2. Th. Rumina Godt. Enc. 31. ix. 83. n. 3. (I8I9). 



Boisd. Sp. Gen. 1. 387. n. 4. (1836). 

 P. Rum. Linn. Sijst. Nat. 11. 783. n. 200. 

 (1767). 

 Fab. Ent. Syst. in. i. 244. n. 759- ( 1 7£>3). 

 Hiibn. Europ. Schmett. Pap. f. 633, 634. and 

 Var. f. 394, 395. (1806-27). 

 Var. P. Medesicaste Hiibn. Europ. Schmett. 



Pap. f. 632. (1806-27). 

 Th. Med. Godt. Enc. 31. ix. 84. n. 4. (181 9). 



Boisd. Sp. Gen. 1, 3S8. n. 5. (1836). 

 Var. Th. Honnoratii Boisd. Icon. Hist. t. 3. f. 3-5. 

 (1832). 

 S. Europe. B. M. 



3. Th. Cerisyi Godt. Enc. 31. ix. Suppl. 812. n. 1-2. (1823). 



Boisd. Icon. Hist. t. 2. f. 1. 3. (1832). 

 Boisd. Sp. Gen. 1. 383. n. 1. (1836). 

 Frcyer, Neuere Beit. t. 259. (1839). 

 Asia Minor, S. Europe. B. M. 



It has already been remarked, under the genus Leptocircus, that perhaps the nervule commonly viewed as the third 

 subcostal nervule of the posterior wings is in reality a discoidal nervule. A careful examination of the posterior wings 

 in Leucophasia, Leptalis, Terias, the Heliconida:, and many Heterocera, has convinced me of the correctness of this 

 opinion. 



I believe it will be found that no nervure ever throws off ncrvules from both sides : but that those nervures which 

 constitute the framework of the upper or anterior portion of the wing always throw them off towards the costa, or 

 the apical portion of the outer margin ; those belonging to the lower portion of the wing towards the inner margin, or 

 the posterior portion of the outer margin. The discoidal nervure of the anterior wings, which merely divides into two 

 nervules directed almost immediately forwards, can hardly be considered to form an exception to this rule. 



Now in Leucophasia, Leptalis, and many species of Terias, we find the subcostal nervure apparently throwing off a 

 nervule from its inner side, then at some distance dividing into two nervules. In many Heliconida} we find the third 

 subcostal nervule (as it would commonly be considered) not a branch of that nervure, but connected with it by a 

 distinct disco-cellular nervule, which forms an acute angle with the subcostal nervure, being directed backwards into 

 the cell ; and we find this so called third subcostal nervule extending into the cell, beyond the point of union with the 

 disco-cellular nervule, as is often the case with the discoidal nervule of the anterior wings in this group. In some 

 Heterocera we find a distinct nervure traversing the cell longitudinally, and reaching the outer margin ; being thus a 

 true discoidal nervure, not branching into nervules. 



I shall, therefore, henceforth consider the subcostal nervure of the posterior wings as dividing into only two nervules ; 

 and what has been called its third branch as a discoidal nervure of which the basal portion is wanting, and which 

 consequently arises either from the subcostal or median nervures, or one of their nervules, or is connected with both by 

 a disco- cellular nervule. 



I shall, also, vary slightly from the nomenclature of the nervules which I have endeavoured to establish in the 

 Transactions of the Linncan Society, by speaking of the connecting portion of the two discoidal nervules of the 

 anterior wings as the middle disco-cellular nervule ; though I am aware that this designation is not quite correct, and 

 that it would be more proper to call it the disco-cellular portion of the discoidal nervules. 



In the family we are about to enter on, a structure of the claw occurs which is not to be found in the Papilionidse. 

 Outside of the claw is an appendage of a more or less triangular form, membranaceous and hairy, often so broad 

 as almost to conceal the claw, sometimes very narrow and almost linear. To this M. Doyere has applied the name of 

 Manchette, a word which does not appear to me to be exactly applicable to it. I shall speak of these appendages as 

 Paronychia. 



February, 1847. 



K 



