268 
Mr. Li>nis B. Prout on the 
Cam 2 otograriima corticeata, Walker, List Lep. Ins., xxvi, 1715 
( 1862^2 
I'erizoraa fasciolata, Warren, Nov. Zook, iv, 454 (1807).^ 
Pcrizoma m uscosata, Warren, Nov. ZooL, vii, 180 (1900).^ 
? Pcrizoma ochritincta, Warren, Nov. Zool, xii, 336 
(1905).^ 
YPonzomd] imellci, Tliieny-Mieg, MS., in coll. Dognin. 
(•‘^) Goya, in some numbers (also from that locality in 
coll. Br. Mus.); (■^) Parana, Entre Rios; Buenos Aires 
(A. F. Bayne), (also in coll. Br. Mus., from Berg—under 
the name “ Glaueo'pteryx tegndatci” vide snjn'a — and from 
H. Wilkinson); Mendoza (?) March 1905 (W. M. Bayne). 
Geographical distribution: (^) (^) Montevideo ; (^) Para¬ 
guay (Warren’s type) ; (®) ? Huatuxco, Vera Cruz (Warren’s 
type of ochritinda). 
I liave very carefully compared Warren’s fasciolata with 
Walker’s types, and though the latter are in damaged 
condition there can be no doubt about their identification. 
They happen to be slightly larger than the average, but 
the British Museum also possesses specimens from Colon, 
^Montevideo (Oldfield Thomas), which are typical in size. 
As regards Warren’s type of ochritinda, its wings are, as 
he says, somewhat narrower, or, as 1 have indicated in my 
MS. notes, “ somewhat narrower than the average ” as com- 
parecl with typical imgiromissata ; were it not for the 
geographical difficulty, I should not hesitate to sink it. 
Thanks to the generosity of Mr. A. F. Bayne, who has 
allowed me absolutely unrestricted selection from among 
the long series which he has collected, I have a picked lot 
of thirty-seven Buenos Aires examples of this remarkably 
variable species. A full analysis of their variation might 
almost be made the subject of a separate i3aper; to a 
British entomologist one may give some idea by saying 
hat it is a veritable Dysstroma citrata (immanata) among 
be Argentine Geomdridae. The commonest forms seem 
to be the rather sombre ones with a moderately darkened 
median band, or pretty nearly unicolorous; not infrequently 
the band is black, reminding of Xanthorhoe ferrugata ab. 
unidentaria, especially when (as sometimes happens), the 
paler areas are more or less coloured with ochre. Some¬ 
times tlie nearly unicolorous forms are strongly tinted with 
mossy green (ab. muscosata, W^arr.), sometimes they are 
nearly melanic. Very fre(piently the median band is more 
