Mr. A. E. Eaton on some British Neuroptera. 401 



triangle ; they seem to consist of one joint only, and are testa- 

 ceous. The filiform part is curled in a peculiar manner, its 

 general direction being first upwards and then backwards and 

 inwards towards the tip of the penis. Its middle portion being 

 hidden more or less by the long hair of the segment, the extre- 

 mities are at first liable to be mistaken for two independent 

 organs; and the shape of the upper would be likened to an 

 italic S. The above-mentioned appendices are glabrous ; but the 

 app.interm.are clothed with short hairs. The whitish app.interm. 

 are obovato-lanceolate and curved inwards at the tips j they are 

 furnished with a slender divergent process near the base, and 

 are applied to the edge of the segment during life. Seen from 

 the side in this position, they appear to be obliquely truncate. 

 Penis bifid, strongly deflected in dried specimens; the tri- 

 angular points of its upper sheaths project from beneath its ob- 

 long upper cover. Its long and subulate lower sheaths are 

 about equal in length to the penis, and are curved downwards 

 at the tips. The dorsal extension of the last segment has a 

 raised dot on each side^ and two raised longitudinal lines in the 

 middle*. 



This insect is common above Cambridge, from the end of 

 April to the end of May. I have found it also on the Kennet 

 and Avon Canal, near Reading. 



Tribe SUBULICORNES. 



Family Ephemeridae. 



Genus Cloeopsis, mihi. 



C diptera, L. 



In the museum, together with the ordinary form of this in- 

 sect, are some specimens whose costal area is traversed towards 

 the apex by numerous irregular veins, which here and there are 

 united so as to form double cells. An examination of living 

 specimens is required before their identity can be disproved ; 

 but as, even in the dry examples, there appear to be some other 

 slight deviations from the type, this is possibly a distinct 

 species. 



* Dr. Hagen considers these to be the app. sup., and the app. sup. of this 

 paper to be the penis-sheaths. In figs. 9 and 10 the wings are represented 

 with the costal fokl not flattened out ; and the pouch-hke fold near the 

 short nervure at the base of the fore wing ( ^ ) is not given in fig. 10. 

 This should be borne in mind if at any time they happen to be compared 

 with the figure in a monograph of Berea and its allies which, I am told. 

 Dr. Hagen is going to bring out. The usual tubercles on the head are 

 largely developed. 



