6 ENTOMOLOGICAI, NEWS [Jan., '15 



abundant but was not found at all upon damsel-fly nymphs. 

 With this exception the more common forms seemed to be 

 generally distributed among the families, regardless of the 

 difference in the habitat of the nymphs. 



Other Algae.^ — Oedogoniiim, Oscillatoria and Beggiatoa 

 were common ; other forms appearing occasionally in scattered 

 filaments. The nymphs which climb about just above the bot- 

 tom made an ideal dwelling place for Beggiatoa. 



Rhizopoda. — Rhizopoda are represented by Amoeba lobosa 

 and Difflugia. 



CiiyiATA. — Because of the greater number of sessile forms 

 the ciliates were far more numerous than any other group 

 of animals. Epistylus plicatilis, E. nympharum and Vorticella 

 became exceedingly abundant as the season advanced. Late 

 in June some Enallagmas were almost completely covered 

 with them, even the antennae bearing great white clusters. 

 Vag'micola and Cothurnia are also sessile forms. Paramoecium 

 and Euplotes appeared a few times. 



Flagellata. — Buglena viridis and Euglena deses, Phacus 

 pleuronectes, Anisonemn acintis and Peranema tricophorus 

 compose the list of flagellates. 



SuCTORiA. — The Suctorians, Podophyra quadripartita and 

 Acineta tuber osa were found only on Gomphines and Libel- 

 lulids, but on these in great abundance. 



RoTiFERA included Floscularia, Notholca, Monura, Philo- 

 dina. 



Chaetonotus and two undetermined rotifera, Anguillula, 

 an oligochaete worm and an ostracod complete the list of ani- 

 mals found in this population. 



The Zygoptera and some of the Aeshnines, especially Anax 

 Junius, which climb about more actively upon the weeds near 

 the surface of the water, have the smallest number of plants 

 and animals upon them. The Gomphines, which burrow be- 

 neath the bottom, have relatively few as compared with the 

 other nymphs which climb about on the weeds near the bot- 

 tom or crawl over the mud. No parasites were found, but one 

 Libellulid nymph was observed on which a Chironomid larva 



