PLKBEIN2E. 
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 Plebeius 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 Euchrysops have filamentous tails, and in that they differ 
from the other Plebeids , but in every other respect Edales is a true Plebeid , and 
Euchrysops very nearly related. 
Note. —Tutt says (Britt. Butt. ix. p. 327) that the character (smooth or hairy 
eyes) is of little importance, and <c 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 Lycaenidse 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 Lycsenidm do we find hairy- 
eyed and smooth-eyed genera that have to be put in the same sub-family ; in the 
Plebeinse 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 Hypolycseninse 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. 
Geryclinae. 
Curetinse. 
Lycaenopsinas. 
Ruralinae = Theclinae. 
Everinse. 
Aphnaeinae. 
Lycaeninae. 
ChrysophaninaB. 
Poritinae. 
Amblypodinae. 
Cheritrinae. 
Horaginae. 
Biduaiiclinae. 
Loxurinae, 
Liphyrinae, 
SECTION I. 
Genus PLEBEIUS. 
Plebeii, Linnaeus, Syst. Nat. i. (2), p. 744 (1767). Cuvier, Tabl. Elern. p. 591 (1799). 
Plebeius , Kluk, Zwierz. Hist. Nat. iv. p. 81 (1780). Crotch, Cist. Ent. i. p. 60 (1872). Kirby, 
