550 THE FUR SEALS OF THE PRIBILOF ISLANDS 



II. HYMENOPTERA. 



Family CHALCIDIDAE. 

 Tridymus capreae L.' 



Oue specimen found in vial with ticks and lice fonnd on the fur seal (Barrett- 

 Hamilton). This is a common North European species and is parasitic in dipterous 

 galls on willow. 



Family ICHNEUMONIDAE. 

 Exolytus sp.' 



Four specimens were collected by Mr. Barrett- Hamilton on St. Paul Island. 



Pezomachus sp.' 



Two s])ecimens from St. Paul Island collected by Mr. Barrett-Hamilton. 



Family APIDAE. 



Mr. Elliott (Peport on the Seal Islands of Alaska, p. 12) says: "The, to our eyes, 

 familiar form of the bumblebee, liomhns borealift, passing- from flower to flower, was 

 rarely seen; but a few are resident here." The determination must be considered 

 doubtful and the species maj'^ possibly be the 7>. f/elidus Cressoii, which has been 

 described from the Aleutian Islands, It is possible, also, that several species of 

 Bombus may occur on the Pribilof Islands. 



III. LEIMDOPTERA. 

 Suborder LEPIDOPTERA RHOPALOCERA. 



No species of this suborder seem to be recorded from Pribilof Islands and none 

 were among the collections transmitted to the Museum, but Mr. Elliott (1. c.) remarks 

 that "a very few species of butterflies, principally the yellow Nymphalidae, are 

 represented by numerous individuals.'* The yellow butterflies referred to are unques- 

 tionably Pajnlionids of the genus Colias, several s])ecies of which are recorded from 

 Alaska, viz, C. hecla Lef., C. palacno Linn., C. chippeira Edw. The last named species 

 is almost sure to occur on the Pribilof Islands. 



Suborder LEPIDOPTERA HETEROCERA. 



None are recorded from the islands, though various families are undoubtedly rep- 

 resented. The Museum possesses only two specimens of an undetermined Arctiid 

 larva (collected by Barrett- Hamilton on St. Paul Island. 



IV. Order DIPTERA. 



No species have hitherto been described from the Pribilof Islands, but Mr. Elliott 

 (1. c.) records some interesting notes on Diptera which are incorporated in the fol- 

 lowing list. Nine species of this order (besides a single larva) were collected by 

 Mr. Barrett-Hamilton on St. Paul Island and have been determined by Mr. D. W. 

 Coquillett. 



' Determined by Mr. William H. Ashmead. 



