192 MR. J. O. WESTWOOD ON THE LEP1DOPTEROUS 



67. (12) Castnia linus. 0. alis nigris hyalino-albido variis, venis nigris ; anticis macula 

 magna subtrigona, venis divisa, fascia media e costa ad angulum internum api- 

 calem extensa in duas partes interrupta, macula magna ovali subapicali in 9ex 

 partes venis divisa, serieque submarginali punctorum alborum : alis posticis macula 

 maxima discoidali transverso-ovali, serieque externa macularuni conoidearum magni- 

 tudine decrescentium versus angulum analem, ubi in puncta alba evadunt. Long, 

 corp. unc. lj-1^-. Expans. alar, antic, unc. 3|-4. 

 Variat venis in disco pallido alarum posticarum concoloribus nee nigris, maculis prope 

 angulum externum minoribus punctisque versus angulum analem fere obliteratis. 

 Papilio linus, Cramer, iii. pi. 257. fig. A; Herbst, Ins. pi. 78. f. 4. ; Dalman, Monogr. p. 24; Act. Holm. 

 1824, p. 405 {Castnia linus) ; Gray, Trans. Ent. Soc. L. ii. p. 147 ; Walker, Cat. Lep. B. M. p. 32 ; 

 Boisduval, H.n. Lep. Het. p. 544, f. 15. 

 Var. C. heliconioides, Herrick-Schaffer, Samml. exot. Sckmett. pi. 4; Walker, op. cit. p. 1582; Bois- 

 duval, H. n. Lep. Het. p. 545 [Gazer a hel.). 



Sab. Brasilia, Surinam, Cayenne, Guatemala. Mus. Britann., Hopeiano Oxoniae, 

 Boisduval. 



Dr. Boisduval has separated two specimens in his collection from Cayenne from tbe 

 more ordinary Brazilian ones, considering tbe former the true representatives of 

 Cramer's figure of C. linus from Surinam, and giving to the Brazilian insects a new 

 name, O. heliconides (recte Heliconioides, as previously published by Herrich-Schaffer). 

 I cannot, however, regard these insects otherwise than as belonging to one species, dif- 

 fering both individually and geographically, and even sexually : variations of the latter 

 character are exhibited in the form of the wings, which modifies to a certain extent 

 the form of the markings. Thus a female specimen in the Hopeian Collection from 

 Cayenne has the fore wings broad and almost ovate; and a male from the Amazons 

 (also with the veins of the disk of the hind wings concolorous) has the fore wings re- 

 markably long, as will be seen from the admeasurement of one of the fore wings of 

 these individuals as compared with those of two Brazilian specimens with black veins. 



Veins of disk of hind Veins of disk of 



wings concolorous. hind wings black. 



Cayenne 5 . Amazon 3 . Brazilian £ . Brazilian 3 . 



Length of fore wing 48 centim. 50 47 45 



Width of ditto 25 „ 23 22J 22 



Length of outer margin from extreme 



apex to inner angle 29 ,, 30 28 26 



Length from base to inner angle ... 30 „ 31 29 30 



It will thus be seen that instead of the Brazilian individuals being " un peu plus grands 

 avec les ailes plus larges" than those of the Cayenne ones, as stated by Boisduval, the latter 

 are the largest in every respect, and more especially in the width of the wing. 



The Cayenne female before me has the large spot of the hind wings more ovate, 

 the black anal margin extending further towards the base than in the Brazilian spe- 

 • cimens ; the veins in this large spot, in this female and in three other specimens in the 



