142 THE ENTOMOLOGIST S RECORD. 
seems to suit my specimens admirably. I must, however, state my 
distinct impression that they are in no way hybrids, but simply an 
aberration of thetis; the diffused marginal pattern and the tone of blue 
probably recall the aspect of coridon by some factor having interfered 
with their normal development ; it will be remembered that a greenish 
colouring and a broad shadowed marginal band and nervural streaks 
are to be seen on the wing in the chrysalis of thetis before emergence. 
I should thus conclude that most of the supposed hybrids are 
either hypermorphic coridon, having progressed towards thetis, or hypo- 
morphic thetis, having stopped in their development at a stage 
resembling coridon. 
A third aberration, quite distinct from the two just described, is 
represented by two specimens collected near Florence many years ago 
by the late Prof. Pietro Stefanelli and now in his collection ; they are 
mentioned by him in the Bull. Soc. Ent. Ital., xxxii. (1900); one he 
found at the end of July in the plain, where thetis and aragonensis have 
a generation in June and one in August-September ; the other he found 
on Mount Fanna, 600m., where, besides these two species, there exists 
coridon on the wing in August, at a time just preceding their second 
emergence; the aberration in question was captured at the beginning 
of this month. Never has Querci nor have I found another specimen 
amongst the thousands of the three species examined from these 
localities. By their size and rounded wings these two specimens quite 
agree with thetis; the fringes instead are longer and chequered as in 
arayonensis and coridon; the marginal streak is extremely narrow and 
sharply defined; the premarginal spots are entirely absent on forewing 
and very minute on hindwings; thus, the marginal pattern is just like 
that of thetis; the ground colour is very glossy, but with a very pale 
colouring; in certain lights it is pale blue, somewhat as in the corydonius 
of coridon, in others it is silvery white, with a greenish tinge. As 
regards the underside, it must be remembered that thetis race etrusca, 
aragonensis race florentina, and coridon race apennina differ much less 
from each other on that surface than do these species in other regions, 
and that specimens occur which it would be impossible to ascribe to 
the right one, without the aid of the upperside characters. Stefanelli’s 
aberrations belong to the latter, but, if anything, resemble aragonensis 
and coridon rather than thetis, on account of the thickness of the 
premarginal black lunules; the forewings are whitish, the hindwings 
pale fulvous, as in most Tuscan Agriades of the second generation. I 
propose naming this lovely aberration preTRr in memory of its 
discoverer. It seems to come nearer being a hybrid than samsont and 
and Querci’s polonus, both by its aspect and time of emergence, but in 
this case the specimen found in the plain, where cordon does not 
exist, would show that the cross had been between thetis and 
aragonensis. 
With calydonius, Lowe, the ambiguous polonus, Z., of past authors 
bas thus now been split up into four distinct European aberrations. 
[I have received from Dr. Verity a request to add a note with 
regard to the five specimens which I| took at Assisi in the summer of 
1909 and which I described as polonus, Zeller, dnd regarded as hybrids 
between the two species coridon and thetis. The upperside of all five, 
though slightly differing in shade (due, I think, to their different 
degrees of freshness), is of a colour about midway between the blue of 
