59 
Arge is inadmissible, because it is the specific name of one of the European species. 
Those who adopt the name Arge for the genus employ for the species Amphitrite, a 
name subsequently given to it. 
“ Erebia Epiphron, Knoch (Cassiope, Fab.) — If Staudinger is right in referring 
Erebia Epiphron and E. Cassiope to the same species, the latter name must sink, as 
Epiphron has the priority by ten years. 
“ Erebia Medea, W. V. (Blandina, Fab.) — The name Medea should be retained, 
as it has a priority of seventeen years. 
“ Polyommatus Medon, Hufnagel (Agestis, W.V.)—The former name has a 
priority of ten years, and should be retained. 
“ Polyommatus Icarus, Rottemburg (Alexis, W.V.)—The name Icarus has a slight 
priority, but that of Alexis is extremely objectionable, as there is an East Indian spe- 
cies of Stoll’s (4 lianus of Fabricius) bearing that name. The British species in 
question need not be confounded with the Icarius of Esper, a European insect, as we 
can adopt Schneider’s name Amandus for that, as, if the two names are not simul- 
taneous, it is probable that Schneider’s has the priority. 
“ Polyommatus Semiargus, Rottemburg (Acis, W. V.) — Rottemburg’s name has a 
slight priority over the other. 
“ Pyrgus Malve, Linn. (Alveolus, Hub.) — Both Wallengren and Standinger 
agree with Westwvod in assigning Linneus’s name to this insect.  Illiger’s P. 
Malvarum, to which Linneus’s description is generally referred, does not appear to 
occur in North Europe at all. 
“Genus Cyclopides, Hub. (Steropes, Bd.) — Boisduval’s name is quite inad- 
missible, as it is the specific name of the type of his genus, for which he uses the name 
Aracinthus, given to the insect eighteen years after the former one. His genus Syrich- 
thus (Pyrgus, Hib.) is also objectionable, as it is the Fabrician synonym of the 
North American Oileus of Linneus, a species most certainly belonging to Boisduval’s 
genus Syrichthus.” 
Papers read. 
Mr. W. C. Hewitson communicated “ A Monograph of the Genus Ypthima, with 
Descriptions of two New Genera of Diurnal Lepidoptera.” The new genera Coenyra 
and Xdis consist each of a single species— Coenyra Corycia, from Natal; and 
Xois Sesara, from Fiji. Of Ypthima twenty-four species are enumerated, of which 
seven are new, viz., Y. Inica (East India), Y. Itonia (White Nile), Y. fasciata (Sara- 
wak, Sumatra), Y. Ceylonica (Ceylon), Y. Loryma (Macassar, Celebes), Y. Methora 
(North India), and Y. Sepyra (Gilolo, Batchian). 
Captain Hutton, of Mussooree, N.W. India, communicated a paper “On the Re- 
version and Restoration of the Silkworm.” In this, the concluding part of a former 
communication to the Society (see ‘ Transactions, 3rd series, ii. 143), the author de- 
tails the progress of his experiments during 1864, with a view to the restoration of the 
silkworm to its pristine state of health. The selected black worms were hatched on 
the 2lst March, some of the eggs having been laid in the spring and others in the 
autumn of 1863; all were decidedly unhealthy, the autumn batch less so than those 
of the spring ; the latter were so terribly afflicted with jaundice, and with some disease 
that turned the worms dull green, that the whole of them had to be thrown away. The 
worms from the autumnal batch of eggs went on satisfactorily and spun good cocoons, 
the moths from which deposited a goodly number of eggs at the end of May, and these 
began to hatch for a second crop in September. With a few of this brood the author 
