2l8 



BULLETIN 01? THE BUREAU FISHERIES. 



Food Found in th^ Aumkntary Canai. of 218 Imagos of Pantai^a Fi^avesckns in Hawaii — 



Continued. 



Coleoptera: 



Scarabaeid beetle, Psammodius, sp 22 



Bostrichid beetle, Rhizopertha pusila i 



Staphylinid beetle 31 



Undetermined beetles 30 



Hemiptera: 



Plant lice, Aphidse 24 



Water boatman, Corixa blackburni 4 



Leaf hopper, Perkinsiella saccharicida 4 



Leaf hopper, Draeculacephala moUipes 3 



Leaf hopper, Nesophrosyne perkinsi 3 



Chinch bugs, Lygseidse 2 



Lace bugs, Teleonemia lantance 4 



Undetermined species i 



Hymenoptera: 



Apis, not the Honeybee i 



'Parasite, Chelonus blackburni i 



Parasite, Paranogrus optabilis i 



Undetermined Hymenopterous parasites 3 



Myrmicid ants, Pheidole megacephala 6 



Undetermined ants 11 



Lepidoptera: 



Tineid moth, Cremastobombycia lantanella 5 



Undetermined forms 72 



Odonata: Damselfly, Agrion, sp i 



Book lice: Psocidae 8 



Thysanoptera: T hrip s, sp 9 



Arachnida: 



Mites I 



Spiders 2 



Food of PanTala flavESCKns in Hawaii. — This statement is inserted here for sev- 

 eral reasons. It is by far the most complete statement of the food of a single odonate 

 species that has ever been published. This same species is one of those around the 

 ponds at Fairport, and it is widely distributed throughout the United States. Hence 

 a list of its food in Hawaii will give a good idea of the kind of insects it would be likely 

 to eat elsewhere. It is also instructive to compare the Hawaiian foods with those 

 eaten at Fairport. We notice that flies, beetles, and Lepidoptera make up the bulk 

 of the food of this species in Hawaii. There are also present many kinds of Hemiptera 

 or true bugs, especially plant lice, adult water boatmen, and leaf hoppers, some hymen- 

 opterous parasites, ants, and Thrips, a tiny insect which feeds upon the flowers and 

 leaves of some plants. 



In the Fairport list there is a much greater variety of both flies and Lepidoptera, 

 but there are no beetles at all, and the only bug is the plant louse. Their place seems 

 to be taken by the mayflies and caddisflies, which are lacking in the Hawaiian list. 



Economic Value of these Foods. — The chief concern here is the effect upon 

 the life of the fish produced by such wholesale and untiring destruction of the insects 

 around the ponds, as is revealed in these food lists. In dealing with this problem 

 certain considerations are forced upon the attention. 



It will be urged, in the first place, as in the case of the nymphs, that the killing of 

 so many adult Chirononiids, Ephemerids, and Culicids seriously diminishes the number 



