130 Mr. E. Potts on a 



closely punctured ; thoracic dorsum almost nude, the white 

 liairs few and scattered, except at the scutello-mesothoracic 

 suture, where they are dense enough to form a band, and on 

 anterior part of mesothorax, where they form two obscui'e 

 sublateral longitudinal bands ; tegulas testaceous ; wings 

 hyaline, nervures dark brown, second submarginal cell 

 receiving first recurrent nervure almost at its extreme base, 

 and second near its end ; legs black, with white pubescence, 

 pale orange on inner side of tarsi ; spurs whitish ; all the legs 

 slender and simple ; anterior coxa3 with the usual stout spines ; 

 abdomen short and broad, rather shiny, strongly and closely 

 punctured, hardly at all pubescent, except that the hind 

 margins of the first four segments have dense white hair- 

 bands, the last being continued on to the base of the fifth ; 

 sixth segment densely white - pubescent at base, at apex 

 narrowed, produced and emarginate, the outline being like 

 that of the two humps of a camel, but viewed from the side 

 the outline is that of a rose-thorn, the end being curved 

 downwards ; beneath, the apex presents an obtuse median 

 prominence and a short tooth on each side, laterad of which 

 IS an angle representing an incipient tooth ; venter very 

 sparsely pubescent. 



Hah. Las Cruces, New Mexico, Aug. 23, 1897, at flowers 

 of Chrysopsisvillosa in tlie Zarrea-zone {C. H. T. Townsend) . 

 Another, also from Las Cruces, is only 9 millim. long, but 

 evidently conspecific. 



M. Townsendiana by the shape of the apex of the abdomen 

 recalls M. dejlexa, Cress., from Kansas, but in the latter the 

 tip is not emarginate and the mesothorax and vertex show 

 black hairs. 



XXL — A North-American Freshwater Jellyfish. 

 By Edwakd Potts *. 



On June 10, 1880, the first-known freshwater jellyfish 

 {Linmocodium Sowerbii, AUman and Lankester) was dis- 

 covered in the Victoria Regia tanks in Regent's Park, London. 

 ISIear the end of November 1<S84 a primitive " hydriform 

 organism," from which it was supposed the jellyfish might 

 have been derived, was found in the same tanks and described 

 by Alfred Gibbs Bourne f. 



* From 'The American Naturalist,' December 1897, pp. 1032-1035; 

 communicated by the Author. 



t 'Proceedings of the Royal Society,' Dec. 11, 1884, vol. xxxviii. p. 9 

 &c. See also paper by F. A. Parson, Journ. of Queckett Club, 2nd series 

 vol. ii. 1885- 8ti. ' 



