154 EHOPALOCEEA. 



suffused with a pink opalescent reflection ; this colouring is sometimes seen in a slight 

 degree in fresh specimens of C. cesonia. 



The larva is said to feed on various species of Trifolium. 



TERIAS. 



Terias, Swainson, Zool. 111. i. t. 22 ; Boisduval, Sp. Gen. i. p. 651 ; Doubleday, Gen. Diurn. Lep. 



p. 76. 

 Sphanogona, Butler, Cist. Ent. i. p. 44. 

 Pyrisitia, Butler, Cist. Ent. i. p. 44. 



Though the genus Terias can be divided on minor characters, it is remarkably 

 uniform as regards its more important structures ; thus the secondary male organs are 

 all constructed on a similar plan, in which Nathalis also agrees. The harpagones in 

 T. mexicana terminate in three prominent hooks, which have their origin on the margin ; 

 the uppermost and the lowest of these are the longest and turn abruptly inwards ; there 

 is a fourth hook arising from the inner surface near the extremity, and another from 

 below the dorsal edge near the base : these hooks on the harpagones are very charac- 

 teristic of Terias, though they vary in number. The termination of the central rod of 

 the tegumen varies — in some species it ends in a sharp point, in others in a blunt and 

 even serrate edge. So far as the neuration of the primaries is concerned there is but 

 little variation; the second subcostal branch is emitted before the end of the cell, 

 sometimes quite close to it ; the lower and middle discocellulars are subequal. The 

 subcostal branch of the secondaries is emitted at various distances from the end of the 

 cell — sometimes a considerable distance before it as in T. proterpia, sometimes close to 

 the end as in T. euterpe, T. albula, &c, sometimes a little beyond it as in T. mexicana. 

 It is upon this character chiefly that Mr. Butler founds his genera Pyrisitia and 

 Sphcenogona. 



Terias, as a whole, is found throughout the tropical and subtropical portions of the 

 world, and scores of names have been proposed for the very various forms in which 

 many of the species present themselves. Many of these are said to be due to the season 

 of the year at which they appear, wet-season and dry-season broods having each their 

 peculiar characteristics. These observations have been made chiefly in the east. In our 

 country we have not noticed any phenomena of this kind. Nevertheless our difficulty 

 in differentiating many of the species mentioned below has been great, but we believe 

 the twenty-two species we include in our fauna are fairly recognizable. In one respect 

 we have been fortunate in having before us paired examples of many of the species 

 taken together by competent collectors, and we are thus enabled to set forth the 

 complicated synonymy of many of the species with some confidence. 



As it is manifestly impossible for us to review the genus as a whole, we have 

 contented ourselves with grouping the species which immediately concern us under 

 the headings given below. 



