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II. New and little-known Palaearctic Perlidce. By Kenneth 

 John Morton, F.E.S. 



[Read Dec. 4th, 1895.] 



Plate II. 



About a year ago I attempted a preliminary revision of 

 the palaearctic species of the genus Nemoura, as a 

 beginning in the direction of increasing our knowledge 

 of the Perlidx. It was then my intention to take up the 

 genus Leudra next, but the difficulty of getting materials 

 in that genus has led me to postpone treatment of it. 

 Additional material has, however, come to hand in 

 other genera, and I now submit descriptions of several 

 new species belonging to Nemoura, Tieniopteryx, and 

 Capnia. 



With regard to Tseniopteryx, as the description of the 

 new species will include comparative references to T. tri- 

 fasciata, it will, with the addition of appropriate figures, 

 serve to make the latter species better known, especially 

 as regards the c? structure. Albarda's paper (Annales 

 de la Soc. Ent. de Belgique, tom. xxxiii.), dealing at 

 length with the nebulosa group, taken in conjunction 

 with the following notes and figures relating to T. Eisi 

 and T. trifasciata, will practically constitute a revision of 

 the European species of the genus, the only species 

 excepted being monilicornis, which I have not yet 

 seen. 



The addition of another species of Capnia to the 

 British list, or rather its separation from the acknow- 

 ledged C. nigra, is interesting, and a Capnia from 

 Amurland is also described. 



This opportunity is also taken to give a description 

 and figures of a curious little form which may yet be 

 found in this country. It was described by Rostock, in 

 1892, as Capnodes S chiller i ; but as the generic name had 

 already been used by Guenee in Lepidoptera in 1852, the 

 new term Capnopsis is proposed. 



TKANS. ENT. SOC. LOND. 1896. — PARTI. (MARCH.) 



