orbitulus and pheretiades section of genus Plebeius. 207 
Plebeius aegagrus, Chr., sp. bon. (Plates VI and VII, 
figs. 2 on each plate.) 
A beautiful species very similar in colour to quite fresh 
pyrenaica, but more transparent; it has a large black 
spot closing the cell in the primaries and a waved series 
of postmedian black spots usually, these are occasionally 
obsolescent, and I have one specimen in which they are 
absent; below it is of the pyrenaica type, only paler. 
Staudinger, I believe, sent me some of the first specimens 
that he received of this insect, certainly the first he re- 
ceived when he obtained enough to dispose of, and he 
wrote me that he considered it a pretty variety of orbitulus. 
I was young in the study of Entomology then, and accepted 
the dictum of so experienced a collector; my days of 
lumping species as I did then have gone, and I have for 
long looked upon this as a good species; time failed me 
then to examine critically my preparations of the genitalia, 
and now that I have more to do I have had to make time 
for their examination. I give at fig. 1, Plate VI, a 
profile view of orbitulus; at fig. 2, a similar view of aegagrus, 
and also the apex of the clasps, in each case showing the 
teeth, on Plate VII. It will at once be seen that the 
clasp of orbitulus is longer and narrower proportionately, 
the teeth at the upper apex of orbitulus are much further 
apart and might be likened to the teeth of a large circular 
saw, whilst those of aegagrus are small and even like the 
teeth of a tenon saw. Again, the fulerum (the bifid arms 
arising at the base of the clasp) has a very distinct angle at 
a third from the apex, which is entirely lacking in orbitulus ; 
the tegumen is rather shorter and broader and the falces 
are slightly shorter also. The aedoeagus of aegagrus is 
rather stouter and less tapering. 
The species has only been recorded from Persia, and it 
might be expected in its isolation to have set up special 
characteristics as it has done. 
Plebeius jaloka, Moore, sp. bon. (Plate VI, fig. 3; Plate 
VIII, fig. 2.) 
_ The genitalia show perhaps more decidedly than in the 
preceding species that it is distinct from orbitulus. 
The suffusion of blue is bright and darker, quite a distinct 
colour from orbitulus and pheretiades; it has also a distinct 
postmedian row of spots in both wings which is never 
entirely absent; underneath it is often almost white and 
