HETEROCHROA. 



Eyes prominent, setose in front, or naked. 



Labial Palpi short, directed upwards ratlier obliquely, but not reaching above the middle of the eyes, extended 

 but little in front of the head, scaly, with the base hairy beneath, and with an elongated tuft of hair on the 

 upper side of the inner half of the second joint ; the tips rather converging. Apical joint very minute, and 

 ovate-conic. 



Antenna considerably longer than half the fore wings, nearly straight ; with an elongated, very slender club. 

 Thorax robust, especially in the males ; neck transverse, as wide as the head, clothed with erect hairs. Metathorax 

 hairy at the sides. 



Fore ^72^5 elongate, trigonate. Anterior margin arched; apical angle rounded. Apical margin two thirds of 

 the length of the anterior, more or less emarginate. Inner margin nearly as long as the apical one, nearly 

 straight. Costal vein moderately strong, extending to the middle of the costa. Subcostal with its first and 

 second branches arising near together before the extremity of the discoidal cell ; third branch arising at about 

 two thirds of the lengtb of the wing, extending to the apical angle ; fourth branch arising at about live sixths 

 of the length of the wing. Upper disco-cellular vein almost obliterated, branching from the subcostal at the 

 length of two fifths of the wing from the base ; middle disco-cellular very short, rather curved, directed 

 obliquely towards the base of the wing ; the lower disco-cellular very slender, but distinct, arched obliquely, 

 and extending to the median vein either at or a little before the origin of the third branch, closing the discoidal 

 cell, the anterior part of which is rather the longest ; third branch of the median vein considerably arched. 



Hind Wings elongate, trigonate ; the base of the costal margin much arched, but with the greater portion of its 

 length nearly straight. Outer margin (from the extremity of the costal vein to that of the first branch of the 

 median vein) rather longer than the costal margin, nearly obliquely truncate, but strongly scalloped. Inner, 

 or anal, margin grooved, and nearly one fourth longer than the costal one. Precostal vein very nmch curved 

 outwardly. Costal vein much arched to about the middle, and then straight. Subcostal vein branching at 

 about one fourth of the length of the wing. Upjier disco-cellular curved, forming the base of the discoidal 

 vein, arising at a very little clistance beyond the branch of the subcostal ; lower disco -cellular vein obsolete, so 

 that the discoidal cell is open. 



Fore Legs of the male very small and pectoral, with fine silken hairs. Femur rather longer than the tibia. 

 Tarsus half the length of the tibia, exarticulated and simple. Fore Legs of the female rather longer and much 

 more scaly than those of the male. Femur rather hairy beneath. Tibia nearly as long as the femur, slightly 

 curved. Tarsus half the length of the tibia, well articulated when denuded of scales, five-jointed; the basal joint 

 occupying half the tarsus ; second, third, and fourth joints subquadrate, with sharp short spines at the 

 extremity beneath ; fifth joint with several short curved spines, and two longer setaj. 



Four Hind Legs strong ; the second pair in the males moi-e elongate than the hind ones, having the femur longer 

 than the tibia ; which latter has two rows of spines beneath, and two long apical spurs. Tai'sus with several 

 rows of short spines. Ungues, pulvillus, and paronychias formed as in many of the preceding genera. 

 Abdomen rather small and slender. 



Transformations unknown. 



This is a genus of very handsome moderate-sized butterflies, closely allied to Limenitis in most of their strnctui'al details, but which 

 are more readily ilistinijuished by the general appearance and colouring of their wings (which has doubtless led to the proposal of the 

 generic name applied above), as well as by their geographical distribution, being natives of Brazil and the tropical parts of America, 

 where they seem to represent such true Limenites of the East as are represented in the three lower figures of Plate XXXIV. They 

 vary considerably in the form of the fore wings, whicli are much more emarginate in some species than in others, as well as in the 

 depth of the scallops of the hind wings, which almost form tails in H. Gelania Godart (represented in our Plate XXXVI. under tlie 

 name of H. Arecosa). 



There is a very close affinity between many of the species introduced into the following list ; but as they appear constant in their 

 markings, especially in those of the characteristic portion of the fore wings beneath, namely the discoidal cell, they will probably be 

 regarded as distinct species, rather than as geographical or representative subspecies. The great variety and beauty of design which 

 they exhibit, whilst their colours are so few and simple, are very striking chai'acteristics of the group. 



Some of these species, such as ISIarse, Isis, Irraina, and Mesenteria, differ in entirely wanting the white band across the wings, and 

 in having only a very large patch of crimson or orange on the fore wings, running, in the two first-named species, from the middle 

 of the fore margin to the anal angle. Other species, such as H. Nea, Melona, Erotia, Isis, and Lerna, are much more robust than 

 the rest. H. Fessonia and Cestus, in addition to the unl)roken white fascia, have the discoidal cell shorter than usual. 



The under surface of the wings is much more varied than the upper, the ground colour being paler, and the various dark markings, 

 obscurely seen on the upper side, being much more distinct on the lower. Most of the species are, moreover, distinguished by an 

 orange patch at the anal angle of the hind wings, enclosing two black spots. A considerable number of species have been described by 

 Mr. Hewitson in the Annals of Natural History, vol. xx. 



Some of the species certainly approach near to Apatura, and it will be very interesting to ascertain the structure of their Larvje, 

 which may probably prove intermediate between those of Limenitis and that genus. 



HETEROCHROA. 

 1. Hetehochboa Ipuicla. 



Tapilio Iphicla Linnceus, Syst. Nat. ii. 78t. n. 181.; 

 Cle.rclt, Iron. t. 41. f. .S. ; Jones, Icon. t. ~i. f. 2.; 



Fabricius, Ent. Syst. iii. yX. 1. p. l.S.i. n. ^■l?.; Drury, 

 III. vol. i. t. 14. f. 3, 4. 



