ON A RAKE BRITISH ENTOMOSTRACON. 61 



ON A RARE BRITISH ENTOMOSTRACON, 



IL Y( iCnVlTCS S< )1!J>T]> I 'S. 



BY H. K. KOKREST, F.R.M.S. 

 Reail he/ore the Society November 30th, 1880.] 



IhjocnjptuK aonUdus lias beeu found in Russia, Norway, Denmark, 

 and Boliemia ; at Dantzig. Vienna, and at Sedgefield in the county of 

 Durham. It was found in the hist-uamed place in 1863, and described 

 and figiu-ed in the "Annals and Magazine of Natural History, 186:5," 

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



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 Ilyoeri/ptiis sordidtts. I have to acknowledge with 

 thanks the kind assistance of Professor A. Weismanu 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 ffir wissenschaftliclie 

 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 

 few points (to be noted hereafter) in which it differed from the descrip- 

 tion, there could be no doubt that it was I. f^ordidits. Mr. Bolton 

 believes that my specimen came from a small pond in Sutton Park, 

 near Birmingham, and that there were several more in the same water, 

 but when I called upon liim next morning there was not one to be seen. 

 I had fortunately made a careful drawing of it on the previous evening, 

 and also taken copious notes of its anatomy and peculiarities. Although 

 I have carefully searched the pond from which it is supposed to have 

 come, I have never found any more, and the only other specimen that 

 I have seen is one that was accidentally preserved by another gentle- 

 man when mounting a slide of J''olvo.v globator from the same locality. 



* Sedgf flpld, county Durham, i^ the only published British locality, but sicce 

 writing this paper I uj,ve laeiu favour' d by Professor (i. S. Brady with a list of 

 four other places in which he has found it. and whi 'h he has kmdlv allowed me 

 to publish. Tney are Lough Arddery, Conueuiara ; L,out;h Aubwee, Conuemaia; 

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

 drained.) 



