532 



attempted to rear moths from the larvae in them. Many times 

 these have resulted in failure, but occasionally I have secured 

 a moth, and these have proved to be of the genus Opostcga. 

 There are six different types of the mines in Pclca leaves, and 

 probably others not yet known may occur in some of the 

 regions not yet fully explored. The moths that I have reared 

 from these mines are very closely related, but I consider that 

 those from each of the different kinds of mines are different 

 species respectively. Four new species are described herewith. 



Some of the mines seem to occur only in certain species of 

 Pelca, and sometimes as many as two kinds of mines are found 

 in the same leaf. As far as my observations go, five of the 

 species occur quite generally throughout Oahu. Often I have 

 found these five on the same day in some particular place, as 

 for example: October 31, 1920, in the Koolau Range above 

 A\'ahiawa, Oahu. Very little is known of their occurrence on 

 the other islands, but three kinds of mines have been found in 

 Pclca leaves on Kauai, and there is no doubt that there are 

 other kinds yet to be found. 



The types of the species here described are in the collection 

 of the Hawaiian Entomological Society. 



Opostega callosa n. sp. 



Head white. Eye-caps white, the rest of the antennae very pale 

 brownish. Thorax white. Forewings white with a slight brownish suffusion 

 near base, a mideostal patch of very pale brownish, the apical third of 

 wing suffused with the same shade; a dark fuscous apical s]iot within 

 a pale brownish line at base of cil^a ; cilia whitish with a very pale 

 brownish line near tips; expanse (5 mm. Hindwings and C'Ta creamy 

 white. Abdomen and legs pale tawny buff, front legs with fuscous mark- 

 ings outwardly. 



Hab. — Three specimens Waialae Nui, Oahu, February 16, 

 1910 ( Si^'czcy ) : bred from Pclca rotnndifolia. 



The mine of this species (Fig. A) when complete, is a 

 circular callous-like structure about half an inch in diameter, 

 on the upper surface of the leaf. It is formed by the young 

 larva producing at first a very slender mine, and after wander- 

 ing for a time finally coming to a perfect circle, and then con- 

 tinuing in a close spiral inside of this till the center is reached. 



