192 MR. J. O. WESTWOOD ON THE LEPIDOPTEROUS 



67. (12) Castnia linus. C. 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 sex 

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

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

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

 corp. unc. l^-li. Expans. alar. antic. imc. 3^4. 

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



angulum externum minoribus punctisque versus angulum analem fere obliteratis. 



Papilio linus, Cramer, iii. pl. 257. fig. A; Herbst, Ins. pl. 78. f. 4. ; Dalman, Monogr. p. 34; 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. L(5p. Het. p. 544, f. 15. 



Var. C heliconioides , Herrich-ScliafFer, Samml. exot. Sclimett. pl. 4; Walker, op. cit. p. 1582; Bois- 

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



Hab. Brasilia, Suriuam, Cayenne, Guatemala. Mus. Britann., Hopeiano Oxonise, 

 Boisduval. 



Dr. Boisduval bas separated two specimens in bis collection from Cayenne from the 

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

 Cramer's figure of C. llnus from Suvinam, and giving to the Brazilian insects a nevr 

 name, G. heliconides (recte Seliconioides, as previously published by HeiTich-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 modifi.es 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 admeasm^ement 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 



■nangs eoncolorous. hind wings black. 



Cayenne 2 . Amazon J . Brazilian J . Brazilian S • 



Length of fore wing 48 centim. 50 47 45 



Width of ditto 25 „ 23 22i 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 furtbcr towards the base than in the Brazilian spe- 

 cimens ; the veins in this large spot, in this female and in three other sj)ecimens iu the 



