180G.] 27 
Mr. Scott took three species of Corixa at Dunoon, in May, of 
Avhicli there will be more to say hereafter. Two are new to us ; the 
third differs a little in colour and marking from C. Doitglasi, Fieb., but 
as that species was described from a single (^ , and all Mr. Scott's are 
? , there is just room for a doubt about the identity until some males 
are captured at Dunoon; which event is " on the cards." I should be 
very glad if beetle-hunters in Scotch waters captured Corix(B also, for 
I have great reason for hope that there would be new species among 
them. 
I believe I do not err in saying that all the Corixce hybernate in 
the perfect state, in the mud at the bottom of the water, as particles of 
earthy matter adhere to examples taken in the early spring ; but, as 
Westwood has recorded in his " Introduction," they may sometimes be 
seen moving about when the surface is covered with ice. In spring 
and autumn they are most abundant ; in summer they are scarce, ex- 
cept in the larva state. All the species love open water of whicb the 
bottom is clear clay or mud, free from vegetable growth, although they 
like to cling to the stems or higher leaves of aquatic plants ; some in- 
habit indifferently running or stagnate water, others only the latter. 
They often come to the top for air, but their usual habit is to swim 
rapidly about near the bottom, frequently assembling near the margin, 
whence they recede quickly into deeper water and to the bottom on the 
slightest alarm. Therefore, he who would capture them should reach 
beyond them with his net, force it at once to the bottom, and then draw 
it towards him. The individuals of a species are not only gregarious, 
but several species usually live together ; yet though they are so mixed, 
their respective characteristic markings are preserved wonderfully dis- 
tinct, and the differences in the structure of the palae of the males, 
peculiar to each species, are retained with undeviating regularity. 
Lee, June 7th. 
OBSERVATIONS ON THE ECONOMY, MOULTING, AND PUPATION, &c., 
OF A LARVA OF NEPTICULA AUBELLA, TOGETHER WITH SOME 
REMARKS RESPECTING THE HABITS OF THE PARASITE OF 
THAT SPECIES. 
BY CHARLES HEALT. 
(Continued from page 8.) 
At the expiration of twelve hours, the larva succeeded in entirely 
escaping from its old integument ; the " frass," instead of forming a 
continuous line down the centre of the mine as it had done before the 
