PLEBEINM. 11- 



hook and its relation to the dorsal process that afford the easiest characters to 

 seize for the sub-division of the Plebeids (Chapman). 



Tutt has divided the genus Plehelus into several sub-divisions merely on account 

 of small differences in the genitalia, most of them so small, it is impossible to consider 

 them generic characters, we prefer putting them into sections, giving the genitalial 

 differences from Chapman's notes in Tutt's Britt. Lep. x. pp. 156-157 (1907). Polyom- 

 matus, however, though practically similar in every other character, has hairy eyes, and 

 therefore the species of that genus are easily distinguishable ; all the above are tailless. 

 All the species of Edales and Eachrysops have filamentous tails, and in that they differ 

 from the other Plebeids, but in every other respect Edales is a true Plebeid, and 

 Euclirysops very nearly related. 



Note. — Tutt says (Britt. Butt. ix. p. 327) that the character (smooth or hairy 

 eyes) is of little importance, and "does not even separate species belonging to different 

 sub-families." We have not found this to be the case ; in the Heterocera the eye 

 character is of great importance as a family character, and in the Lycsenidse we have 

 found it, almost universally, to correspond with the characters of the genitalia and 

 general structure ; in only two instances in the whole of the Lycsenidse do we find hairy- 

 eyed and smooth-eyed genera that have to be put in the same sub-family ; in the 

 Plebeiuse there are three, Polyommatus, Azanus and Orthomiella ; Polyommatus is a 

 true Plebeid, the others somewhat aberrant ; the other genera are all smooth eyed ; in 

 the Hypolycaeninse the hairy and smooth-eyed genera are in about equal numbers, and 

 form two sections of that sub-family ; the remaining sub-families have no exceptions 

 that we have yet found, and are as follows : — 



SMOOTH EYED. HAIRY EYED. 



Gerydinae. ' Curetinse. 



LycsenopsinBe. Euialinfe = Theclinse. 



Everinoe. AphnajmEC. 



Lycseninse. 



Chrysophaninse. 



Poritinfe. 



Amblypodinse. 



Cheritrinse. 



Horaginse. 



Biduandinse. 



Loxurinas. 



Liphyrinfe. 



SECTION I. 



: Genus PLEBEIUS. 



PJeheU, Linnasus, Syst. Nat. i. (2>, p. 744 (1767). Cuvier, Tabl. Elem. p. 591 (1799). 

 Pleheius, Kluk, Zwierz. . Hist. N&L Iy.. p. 81 (1780). Crotch, Cist. Ent, i. p. 60 (1872). Kirby, 



C 2 



