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Hawaiian Islands are rather rich in ferns, from very small 
moss-like species to large tree-ferns, about 130 species in all, 
and there is found to be quite an extensive insect fauna peculiar 
to these ferns. Perhaps not every species of fern is attacked 
by insects, but there are quite a number which have one or 
more species of insects peculiar to them. Information on these 
insects accumulates slowly, and is as yet far from complete, 
but the following are known at present: 
LEPIDOPTERA. 
Eriopygodes euclidias (Meyrick). [Caradrinidae. | 
This moth is very abundant in the forests where ferns 
abound. Its caterpillar is the cutworm type, though it remains 
on its food-plant in daytime instead of hiding under rubbish 
or in the soil. They feed on many kinds of ferns, and appar- 
ently only on ferns. The caterpillar varies from nearly plain 
green to almost black. 
Scotorythra rara (Butler). [Selidosemidae. | 
Caterpillars of this moth are very polyphagous, mostly feed- 
ing on trees, but they have also been found feeding on ferns. 
They occur on all the islands of the group. 
Batrachedra sophroniella Walsingham. [Hyponomeutidae. | 
The larvae of this moth feed on the sporangia of Aspidium 
cyatheoides, protected by a web. When there are no more 
sporangia, they feed on the undersurface of the frond, eating 
away the parenchyma and leaving the upper epidermis which 
then shows as dead spots. Pupation takes place within a 
cocoon alongside of the midrib of a pinna. This moth is 
known on Oahu, Maui, and Hawaii. I have taken it at 
Pauoa, Mt. Tantalus, Pacific Heights Ridge, Hillebrand’s Glen, 
Halawa, and Waiawa on Oahu; Keanae, Maui; Waimea, 
Hawaii. 
Batrachedra lomentella Walsingham. [Hyponomeutidae. ] 
This species has similar habits, but the identity of the fern 
to which it is attached cannot be stated with certainty. The 
moth is known on Oahu and Hawaii. I reared it from un- 
identified ferns in Hakalau Gulch, Hawaii; and Palolo, Oahu. 
Batrachedra bedelliella Walsingham. [Hyponomeutidae. ] 
The larvae of this tiny moth feed among the sporangia of 
