74 



IlYrSIEXOPTEKA 



Mi/niiicidae 



Fheidole megaccpliaht Fabr. 2 



Ants, midetermined 11 13 



« 



Odoxata 



Libelhilidae 



P(HifaJa flavcsrcii.s Fal)V., nvniplis 6 



Crustacea 



Cypris 108 



Shrimps 3 111 



MOLLUSCA 



Spiral shells 14 



Protozoa ^ 



Euglena 30 



Annulata 



Nereis 1 



Amphibians 



Tacl])oles 8 



Fish 



To|) AlillllCAV {() _.. 1 



Total- __. 390 



Laxi) Ixsects as Food for Xy.mpiis. 



It has been snggosted that, since the Plawaiian streams and 

 other bodies of fresh water contain so very few kinds of aquatic 

 insects, and since the yellow and Idne dragonflies are so nnmer- 

 ons in many localities, the nyni])hs mnst obtain some part of 

 their food from other sources than from the purely aquatic crea- 

 tnres. This outside food is thought to be derived from the occa- 

 sional accidental droi^ping into the water of aerial insects ; or, 

 during freshets when extensive areas of vegetation are snddcnly 

 innndated, from the large nnmbers of insects that drown and 

 are swept into the main water channels. 



In order to find ont if the nymphs really do feed on aerial 

 forms if given a chance, a series of experiments was carried on 

 by feeding the nym])lis, both Aiia.i- and Paidala, in confinement 



