On the Eniomostraca of Lake Bassenthwaite. 467 



32. Tachyris cardena. 



Pieris cardena, Hewitsou, Exot. Butt, ii., Pier. pi. iii. tigs. 17, 18 

 (1861). 



Borneo, Sumatra, Malacca. 13 $ , 1 ? . B. M. 



The examples from Malacca may have to be separated, th 

 3'ellow on the under surface of the secondaries being replace 

 by a much more restricted abdominal patch of orange. 



33. Tachyris hagar. 



<3 . Pieris hagar, Volleuhoven, Mon. Pier. p. 38, pi. iv. fig. 6 (1805). 



Sumatra. 



I think it quite likely that this is only a dry-season form 

 of the preceding species. 



34. Tachyris Homhronii. 



Pieris Homl/ronii, Lucas, Rev. et Mag. de Zool. 1852, p. 325 ; $ , Vol- 

 leulioven, Mou. Pier. p. 5, pi. ii. fig. 3 (1805). 



Celebes. 3 $ , 1 ? . B. M. 



This curious and handsome species leads pleasantly from 

 the present group towards Prioneris, of which it has the 

 general form and aspect, though without the serrated costa. 



LVII. — The Eniomostraca of Lake Bassenthwaite. By 

 Edith M. Pratt, B.Sc. With an Introductory Note by 

 Sydney J. Htckson, M.A., E.R.S., Beyer Professor of 

 Zoology in the Owens College, Manchester. 



Introduction. 



The splendid researches on the character of the fresh- 

 water fauna which have of recent years been made by 

 Zacharias at Plon, by Birge at Mendota, and by many others 

 abroad, serve to remind us how ignorant we are of the fauna 

 of our own English lakes. 



investigations of the inland waters of Scotland have been 

 conducted for some years by Scott*; but Beck's f paper is 

 the only one that gives a systematic account of the Entomo- 

 straca of the English lakes. 



As Beck's investigations were chiefly made in the autumn 

 months it occurred to me that it might be of interest to inquire 

 into the character of the fauna earlier in the year, with tiie 



* Scott, T., Scottish Fishery Reports. Scient. Invest. 1890 onward. 

 Invertebrate Fauna of Inland Waters of Scotland. 

 t Beck, C, J. R. Micr. Soc. (2) iii. p. 780 



