286 CHANCEY JUDAY. 



given in the table does not include the nitrogen in the crude fiber 

 (chitin) which amounted to 0.46 per cent. In comparison with 

 this the larvae of Chironomus tentans yielded a much smaller 

 percentage of nitrogen, namely, 7.36 per cent. 



The larvae yielded a fairly large amount of fat (ether extract), 

 namely 9.45 per cent, of the dry sample. Together the crude 

 protein and the fat constituted more than 76 per cent, of the dry 

 material. From the standpoint of quality, this large proportion 

 of these two. excellent food materials gives the larva of Corcthra 

 punctipennis a very high rank as a source of food for other 



organisms. 



LITERATURE. 

 Birge, E. A., and Juday, C. 



'n The Inland Lakes of Wisconsin. The dissolved gases of the water and 

 their biological significance. Wisconsin Geological and Natural His- 

 tory Survey, Bulletin No. XXII, pp. xx -- 259. Madison. 

 Juday, C. 



'04 The Diurnal Movement of Plankton Crustacea. Trans. Wis. Acad. 

 Science, Arts and Let., Vol. XIV., Part 2, pp. 534-568. Madison. 



'08 Some Aquatic Invertebrates that Live under Anaerobic Conditions. 

 Trans. Wis. Acad. Science, Arts and Let., Vol. XVI., Part i, pp. 10-16. 

 Madison. 

 Muttkowski, R. A. 



'18 The Fauna of Lake Mendota. Trans. Wis. Acad. Science, Arts and 



Let., Vol. XIX., Part i, pp. 374-482. Madison. 

 Pearse, A. S., and Achtenberg, Henrietta. 



'20 Habits of Yellow Perch in Wisconsin Lakes. Bulletin of the Bureau 

 of Fisheries, Vol. XXVI. , pp. 295-366. Washington. 



