200 Species of the Lepidopterous genus Terias. 



from below the third median branch, the apical portion 

 distinctly angulated internally ; the mider surface (as in 

 T. mandarina generally) almost always with an oblique 

 subapical brown dash on the primaries ; females com- 

 moner than males. Fig. 13. 



h. Apical border of primaries much narrower, not 

 angulated internally ; female rather darker than usual ; 

 not common. Fig. 14. 



c. Apical border still narrower, not sinuated towards 

 the costal margin ; female rare. Fig. 15. 



d. Typical T. mandarina, the apical border greyish and 

 interrupted in both sexes ; the external border only 

 represented by dots at the extremities of the veins ; 

 female common. Fig. 16. 



e. No border at all, but the black marginal dots 

 elongated upon the subcostal branches of the primaries 

 so as to form little oblique costal dashes ; female com- 

 moner than the male. Fig. 17. 



I have thus shown that we now possess a complete 

 gradation of slightly differing forms linking the two 

 most dissimilar types of the T. Jiecahe section of the 

 genus Terias, just as in the genus Euploia we possess all 

 the links between the very different-looking E. dolosa 

 and E. violetta, and in Teracohis numerous links, of which 

 more are always coming in, tending to unite the whole 

 of the wonderfully dissimilar forms in that genus ; in 

 Panopea also and Niptif>, with many other groups, the 

 intermediates are constantly coming and making the 

 discrimination of species more difficult, and the study of 

 entomology more interesting ; in a century from the 

 present time, if collectors labour as assiduously as they 

 have done of late, it will be impossible, I believe, for any 

 entomologist to decide without rearing it from the egg 

 whether any form is a species, a hybrid, or a variety. 



So far as I have been able to judge, the T. hccahe and 

 T. mandarina of China are constant ; the intermediate 

 T. anemone does not appear to come from that country, 

 in which case hybridization cannot modify the typical 

 forms. 



