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swept from ferns, and it is likely that they will be found to 
be attached to them when their habits are fully studied. 
Holcobius hawaiiensis Perkins. [| Ptinidae.] 
This beetle has been taken at base of tree-ferns. 
Nesapterus monticola (Sharp). [Nitidulidae.] 
I found two specimens of this beetle in the dead frond-stalk 
of Cibotium menziesti in Palolo Valley. Otherwise the habits 
of the species are not known. ; 
DIPTERA. 
Drosophila sp. [Drosophilidae. ] . 
An undescribed species of this genus has been reared froin 
living frond-stalks of Sadleria cyatheoides at Niu, Oahu, and 
at Kilauea, Hawaii. The larvae are found in the very young 
fronds. They are very elongate, and tunnel up and down in 
the stem. There is hardly a frond to be found on any plant 
of this fern that has not several of these tunnels, but the fern 
does not seem to be seriously injured by them. 
Agromyza sp. [Agromyzidae.] 
An undescribed species of this genus is a miner in the 
fronds of Marattia douglasst. The mines are often very abun- 
dant, but very few adults have been reared. It. occurs on 
Oahu, and possibly on the other Islands wherever the fern 
occurs. 
Homoptera. 
Oliarus kaonohi Kirkaldy and O. montivagus Kirkaldy of the 
Cixiidae have been reared from nymphs occurring in decay- 
ing frond bases and in the fibrous matter of tree-fern stems, 
and in the dead frond-stalks. It is likely that several of the 
cther species of this genus are also attached to ferns, for many 
of them are taken by sweeping on ferns. It is probable that 
the near-related Jolania perkinsi Kirkaldy may be found to 
breed similarly, for the adults are commonly collected from 
ferns. 
Ilburnia ipomoeicola Kirkaldy. [Delphacidae.] 
This small leafhopper is associated with Sadleria cyathe- 
cides. It oviposits very abundantly in the young tender frond- 
stalks. It has been reported on Cibotium, and also occurs on 
