22 BULLETIN BROOKLYN EN'TOM. SOC. VOL. VI. June 1883.7] 
side of tip and two very heavy spines at outer side. Several others of the 
species have very distinctly armed fore tibia, but mot so as to deserve 
special attention here. 4gro/is is the first of the genera having armed 
tibia: the genera placed before it in the family are distinguished in so 
faras the legs are concerned in having them almost universally more 
compact, shorter, the spurs not so long, and on the posterior tibia closer 
together. 
In those species of Acrouycta that I have examined the tarsal claws 
are simple and without tooth or dent of any kind the spurs of tibise are 
more equal, and in the © the tibiae are clothed with longer silky har. 
In Pseudothyatira the legs are much as in Acronycta except that the ex- 
cavation of anterior tibia is very small, and the lappet correspondingly 
diminished in size; the tarsal claws aresimp!e and the middle tibia in 
the ¢' has very dense brushes of hair on the outer side: the femora are 
in proportion less heavy than the tibia. 
Habrosyna scripta Gosse. differs in the still more limited excavation 
of anterior tibia, and in having all femora and “dz in the clothed with 
dense long silky hair. 
In Mamesira the tarsi are proportionately shorter, the claws termi- 
nating them are long slender very decidedly curved, with a feebly marked 
tooth near tip: some ofthe species have a spine or claw at tip of anterior 
tibia: one American form so distinguished has recently been described 
by Mr. Grote as Copimamestra. 
Hadena does not differ, as faras Ican make out except that the 
tarsal claw is more distinctly toothed. | 
Metahadena is an example of anterior tibia armed with a claw at tip; 
quite a number of genera are so armed as a reference to my synopsis will 
show and where there is only a single claw it is always inserted at the 
middle of the tip. The excavation of the fore tibia is very long and the 
lappet extends from near the base to the tip of tibia and is unusually 
broad. 
Erwopus is peculiar in the clothing of the middle ¢ and posterior 
tibia and tarsi being adorned with long fluffy brushes of hair. 
I have seen only one American specimen which showed this pecu— 
liarity in full perfection, and that was what I believe to be an undescrib- 
ed species in the Mr. Edwards’ collection. 
Prodenia has the legs strong and compact, moderately hairy in the Q 
and very densely so in the ¢‘. The inner spur of the middle tibia is un- 
usually long, the tarsi are short and the claws simple. 
