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HyYDRIOMENA FRIGIDATA WIk. 
Dr. W. T. M. Forbes who saw a specimen we had compared with 
the type of this species was of the opinion that transfigurata Swett 
would prove a synonym; certainly Swett’s description would fit our 
compared specimen well. Renunciata Wlk. seemed to us to be a rather 
grayer and uncontrasted form of the same species, but we could match 
it with nothing in our material. 
HyDRIOMENA BISTRIOLATA Zell. 
The type 2 from Dallas, Texas, is quite a different species to that 
from Colorado identified for us as bistriolata by Mr. Swett. It is a 
long palpi form with distinct greenish shade to the paler areas; the 
black band is not so oblique nor is the outer edge so irregular as in 
the Colorado specimens. We have nothing to match it in Coll. Barnes. 
HypDRIOMENA TAENIATA Steph. 
This name should be dropped from our lists; it applies to European 
specimens; explagiata Wlk. should be used in its place. Basaliata 
WIk. (syn. Eucymatoge grandis Hlst.) may prove to be a good species ; 
a series in Coll. Barnes from the west coast of British Columbia is 
larger with the markings less contrasted. 
TRIPHOSA PROGRESSATA WIlk. 
This should be omitted from our lists; the type from S. Domingo 
is a Scotosia and in the British Museum is sunk as a synonym of 
affirmata Gn.; dubitata L. should also be dropped as applying only to 
European specimens. This will leave indubitata Grt. (type loc. Mon- 
treal, Que.) applicable to our Eastern specimens; the larger form 
from the Pacific coast, if distinct from the Eastern race, is without a 
name in its normal form; the name pustularia Edw., given to the 
peculiar mottled form, could however be applied to the whole species 
if the eastern and western races be found distinct specifically. This 
mottled form also occurs in Eastern specimens. 
PETROPHORA CONGREGATA WIk. 
This species, at present sunk in the synonymy of unangulata Haw. 
by some utter misidentification of Hulst’s is the one commonly called 
abrasaria H. S. If necessary therefore this name may be used in 
preference to abrasaria which typically is European. 
