200 CoUcijc of J' ores try 



Family C'llKYSo^n•.I.^D.T: 



Donacia cinctiformis Ncwm. Galerucella nymphaeae 



With egg's (111 leaf of I. inn. I.ar\a. 



Nyinphcea. Dibolia borealis L1k\ . 



The Coleoplera are better represented, as far as number of 

 species is concerned, than any grf)up of the associated animals, 

 21 species being included in the list, 'i hey are confined mostly 

 to shallow water (surface to four feet) and to clay, mud, and 

 sand bottoms, llie larva of Gyrinus, however, was collected 

 at a depth of ii feet. The small beetles were associated with 

 filamentous algcC in which several species were very abundant. 

 Gyrinid beetles {Gyrinus affinis and Gyrinus vcntralis) were 

 notably al>undant in the (|uiet water of Short Point Ray where 

 they formed great masses on the surface, sometimes over an 

 area of 20 square feet. The larvae of Pscphcnus were very 

 abundant on boulders associated with the May-fly nvmphs 

 (Matheson, '14, pp. 185-188), Heptagenia, and the mollusks, 

 Galha and Goniohasis. The Chrysomelid beetles and larvae 

 were observed on the leaves of the Water-lily, Nynihluca 

 advena (identified by Dr. Welch). Identifications mostly by 

 Mr. Wm. J. Gerhard. 



Class Arachnoidea 

 oki)i:r acarina 

 Family Hydracmnid.e 

 Hydrachna species. 



Family Limnociiarid.e 

 Limnochares aquaticus (L.). 



