438 ME. W. F. KIKBT ON THE GEOGRAPHICAL DISTEIBUTION OF 



Mexico and the United States, belong to purely tropical genera. 

 On the other hand, Cuba and perhaps some of the other West- 

 Indian islands have so strong an affinity in their productions to 

 the Southern States of America, that the line should probably 

 be drawn between two of them in the same way that Mr. Wallace 

 draws the line between the Indo- and Austro-Malayan regions. 

 Jamaica and Trinidad produce chiefly tropical forms ; but in 

 Haiti, and still more in Cuba, the northern and southern fauna) 

 mix, with a preponderance of northern forms. The Nearctic 

 region will probably prove to be somewhat richer than has been 

 previously shown when the intermediate faunae are better known, 

 and the lines can be drawn with more accuracy. Little or 

 nothing has been done in the West Indies, except in the four 

 islands previously mentioned. The only buttei-fly known to mo 

 to inhabit the Galapagos Islands is a single species of the cosmo- 

 politan genus JPleheius (P. parrhasioides, Wgr.), which genus, 

 however, is badly represented in all the tropical and southern 

 fauna). 



Characteristic forms. — Ithomia, Meclianitis, Melincea, Ilcetera, 

 Ccsrois, JEuptychia, Tisiplione, Oressinoma, Elina (Chili), JEteona, 

 Lymanopoda, Calisto (Antilles), PronopJdla, Coradcs, Bia, Morpho, 

 Brassolis, Opsiphanes, Dynastor, Penetes, Caligo, Narope, JDasyopTi- 

 thalma, Colcenis, Bione, Clothilda, Phyciodes, Chlosyne, Ilypanartia, 

 Napceocles, Anartia, Cyhdclis, Eunica, JSpiphile, Myscelia, Catone- 

 phele, Temenis, Bynamine,Catagramma,Callithea, Batesia, Ageronia, 

 Didonis, Cystineura, Lucinia (Ant.), Pyn'hogyra, Megalm'a, Victo- 

 rina, Adclpha, Aganisthos, Brcpona, Agrias, Smyrna, Mcgistanis, 

 Ancea, Ilypna, Sidcrone, Brotogonius, Lemoniidce (all except the 

 genera Nemeohiiis, Bodotia, Zemeros, Abisara, Taxila, and Bical- 

 laneura), Thestor, Lamprospilus, Theorema, JEumcEus, Trichonis, 

 Beeute, Archonias, Ilesperocharis, Bismorphia, Berrhylris, Leu- 

 cidia,Baptonoura,Nathalis, Buryades, Thymcle, Telegonus,Bntheus, 

 Byrrhopyge, Erycides, Butleria, Bythonides, Achlyodes, ILelias. 



Long as this list is, it is a mere selection of the overflowing 

 riches of this district, which produces more than half of all the 

 described species of lihopalocera. Not only is every genus 

 enumerated above (except Thecla, which is repi'esented by a very 

 few obscure species in Europe and North Asia), as well as all its 

 allies, entirely confined to the New World, but the Byccenidce and 

 Bierincc are less richly represented than the other groups. 



The great majority arc wliolly imrepresented north of Mexico. 



