4 NOCTURNAL LEPIDOPTERA FOUND IN CANADA. 
yellow, with a dark border; the first mferior vein generally more 
slender than the others. 
Intrrus#.—Size moderate or large. Abdomen more or less flat- 
tened ; antennz pubescent or crenulate. Fore wings large, clouded ; 
hind wings of a different color from the fore wings, first inferior vein 
always rather slender, and remote from the others. 
Extens#.—Size moderate. Palpi ascending, almost vertical ; 
second joint curved, generally pilose ; third joint linear. Antennze of 
the male crenulate, with short bristles; of the female simple. Ab- 
domen rather long, smooth, seldom crested. Wings thick, clouded, 
adorned with wavy lines; hind wings almost always of the same color 
as the fore wings. 
Limsat#.—Size large or moderate. Antenne never pectinated. 
Wings broad, well developed; fore wings with flexuous lines; hind 
wings different from the fore wings, gaily colored with two distinct 
hues ; the first inferior vein almost always equal to the others, and not 
remote from them. 
SERPENTINE.—Size moderate or small. Abdomen smooth, not 
flattened. Third joint of the palpi moderately long, not spatulate. 
Wings thick, and rather broad. 
Having now briefly enumerated the chief subdivisions of the group 
Noctuina, I shall proceed to the description of various genera and 
species, taking up the commoner and more easily identified forms first, 
without regard to any particular order.’ 
The subsection Limpar, to which belong the largest and hand- 
somest of our nocturnal moths, is only represented in this country by 
one genus, CaTrocaua, of the family Catocatipm. Specimens of 
these insects are generally to be found in every cabinet, as from their 
large size, and gaily colored under-wings, they are very conspicuous, 
and do not easily escape the observation of the collector. Their 
favourite haunts are the trunks of apple and other trees, where they 
feed on the sap that exudes wherever branches have been cut off. 
Toward the end of August, and during September, the commoner 
species may be found hovering about such places, alittle before sunset 
and sometimes even earlier in the day. In repose they form a flat 
gray triangle, completely concealing with their fore wings the brilliant 
colors of the lower ones, and often closely resembling the bark of the 
' ¢reeg on which they rest. 
