LEPIDOPTEROLOGY. — TWO NEW EUROPEAN LYCAENIDS. 3 
only way to settle the point was to examine the appendages of that 
form, and Monsieur Oberthiir very kindly sent me a specimen, a 
cotype, of argus var. ligurica from Cernobbio. This specimen, in its 
appendages and its androconia quite agrees with the Swiss and other 
forms of the new species. The falces are, in fact, rather longer than is 
usual in the Genevan specimens, but agree with them in every other 
respect. The difference does not exceed the amount of variation one 
finds within, specific limits in other species and groups. The new species 
is, therefore, Plebeins ligurica, and my name aequs falls as merely a 
synonym or varietal name for the Geneva race. It is to be regretted 
that the type of ligurica was not included in the first examinations, 
which would have prevented my falling into so undesirable an error. 
The mistake involves a question of nomenclature and not one of the 
actual facts under consideration. ' . 
My paper is illustrated by twenty plates from photographs. M. 
Oberthtr most kindly agreed to my request for half a dozen of the 
blocks for these plates to illustrate this resumé. These do not of course 
illustrate the subject so well as all the plates do, but for the present 
purposes they are quite sufficient. 
_ Plebeius argus.—The appendages are represented in Plate I. (VII. in 
Etudes) from a specimen from Cettinje, taken by our regretted friend 
Mr. Gibbs. JI find trifling variations from each other in my prepara- 
tions of argus, variations that are as great between specimens of one 
race from one locality as between different races. Dr. Reverdin says 
that the characters are different in argus, armoricana, and ligurica, but 
ligurica differed more from the’ two others than they do from each 
other. 
Dr. Reverdin notices that armoricana differs from argus in greater 
length of uncus, a deeper concavity behind the toothed end of the 
clasper, and a rounder extremity to this margin. I have not been able 
to find any such differences, and Dr. Reverdin’s plates 1 and 2 do not 
appear to demonstrate the two first, but show a rounder end to the 
toothed margin of the clasp. As regards this difference, it, like the 
others, is the subject of much individual variation. It is not one that 
attracted my attention, no one form constantly differing from any other. 
My plate (V. in Fase.), not reproduced here, is therefore unbiassed 
evidence, it shows armoricana so far as it differs, to have a less rounded 
margin than the forms alpina and belliert. On the other hand it 
happens to show armoricana with the subterminal angle less marked 
than in the others; but I havea specimen of armoricana with an angle 
at least as sharp as the average, and I have one specimen of Swiss 
argus with an angle nearly as small as in ligurica, and others as small 
. as average armoricana. These variations seem fully to justify my con- 
clusion that the variations within the limits of what I call argus are 
only variations, and are to be found in almost any race, though the 
average of each race does in some item or other differ a little from that 
of other races, as a variation of this sort, some specimens of var. nivea 
(Piynwald) have the toothed extremity very broad, beyond what I 
happen to have met with in other races. There are, no doubt, many 
well-marked geographical races of aryus (aryyrognomon) of which per- 
haps armoricana, bellieri, and nivea are the most marked, sufficiently so 
to be easily definable, but if they are therefore to be called not varieties 
