

THE MIDLAND NATURALIST. 



" Come forth into the light of things, 

 Let Nature be your teacher." 



Wordsworth. 



OX A RAKE BRITISH ENTOMOSTRACON, 

 ILYOCRYPTUS SORDID US* 



BY H. E. FORREST, F.R.M.S. 



Ilyocryptus sordidus has been found in Russia, Norway, Denmark, 

 and Bohemia ; at Dantzig, Vienna, and at Sedgefield in the county of 

 Durham. It was found in the last-named place in 1863, and described 

 and figured in the "Annals and Magazine of Natural History, 1863,'' 

 p. 415, by the Rev. A. M. Norman. f 



On the 22nd November, 1879, Mr. Bolton showed me an Entomos- 

 tracon which at the time was unknown to me, but which I have since 

 ascertained to be Ilyocryptus sordidus. I have to acknowledge with 

 thanks the kind assistance of Professor A. Weismann in determining 

 the species. 



There are three known species of the genus, of which a full account 

 has been published by W. Kurz in " Zeitschrift fiir wissenschaftliche 

 Zoologie,'' supplement to Band xxx., 1878. 



Upon referring to this work and comparing the three species there 

 described with my specimen, I found that although there were some 



* Read before the Birmingham Natural History and Microscopical Society, 

 November 30th, 1880. 



1 Sedgefield, county Durham, is the only published British locality, but since 

 writing this paper I have been favoured by Professor G. S. Brady with a list of 

 four other places in which he has found it, and which he has kindly allowed me 

 to publish. They are Lough Arddery, Connemara ; Lough Aubwee, Connemara ; 

 pools by the side of Ennerdale Lake ; 'and East Belsay Lake, Northumberland, (now 

 drained.) 



B 



