ol 
on Oahu and Lanai. It is not confined to ferns, however, for 
it also occurs in dead branches of many kinds of trees and 
shrubs. 
Pentarthrum prolixum Sharp. [Cossonidae.] 
This elongate weevil is found, often abundantly, in the dead 
frond-stalks of two or three species of Cibotium, tree-ferns. 
It does not occur on anything else. It is common on all the 
Islands. 
Dryophthorus pusillus Sharp. [Cossonidae.] 
This weevil occurs on Oahu, and inhabits decaying tree- 
ferns, Cibotium spp. 
Dryophthorus modestus Sharp. [Cossonidae.] 
This species occurs on Oahu, Maui, and Hawaii, and is 
rarely found in similar places to the preceding. 
Dryophthorus insignis Sharp. [Cossonidae.] 
This species occurs on all the Islands and is more often 
found on tree-ferns, inhabiting the dead frond-stalks. The 
species of the genus Dryophthorus usually feed in rotten wood, 
and it is likely that some of the other species may also be 
found in decaying fern-stems. 
Pseudolus longulus (Boh.). [Cossonidae.] 
The larvae of this weevil feed in the dead frond-stalks of 
Cibotium chamissot. They also feed in dead bamboo and other 
dead or rotten wood. It occurs on all the Islands. 
Proterhinus longulus Sharp. [Proterhinidae. ] 
This representative of the endemic family Proterhinidae is 
found on tree-ferns (Cibotium chamissoi, C. menziesii). The 
larvae feed in the dead frond-stalks. The species occurs only 
in the forests of Oahu. 
Proterhinus pteridis Perkins. [Proterhinidae.] 
This species occurs on Molokai, in the leaf-stalks of a 
species of Pteris. 
Proterhinus sharpi Perkins. [Proterhinidae. | 
This species occurs on Haleakala, Maui, on a non-arboreal 
fern. A number of other species of Proterhinus are commonly 
