EPHEMERlDiK. C.ENIS. 61 



Deep brown-black, slightly shining ; abdomen pitchy ; filaments nearly four 

 times as long as the body, pale fuscous, faintly dotted with fuscouSj articu- 

 lations long; legs pitchy-brown; wings transparent; costa, especially 

 towards the base, fuscous. 



Taken in the vicinity of London, in June. 



Sp. 2. dimidiata. Piceo-nigra, abdomine pallido, pedibus ochraceix, alls lacteis 

 costa fused. (Exp. Alar, 3g lin. ; Long. corp. 1|: lin. ; 1. set. 4 lin.) 



Cae. dimidiata. Steph. Nomen. 2d edit. Appendix.- — Br. minimus. Curtis, 

 Phil. May. 1834.? 



Pitchy-black, shining ; abdomen pale ; legs ochreous ; setse long and pale ; 

 wings milk-white, costa fuscous. 



Taken near London ; and in Norfolk ? 



B. With the filaments scarcely longer than the body, or shorter, stout at the 

 base: — Brachygercus, Curtis. 



Sp. 3. brevicauda. Piceo-fusca, abdomine pedibusque pallidis, alis albidis, costa 

 fused, setis brevibus. (Exp. Alar. 4 — 4§ lin.; Long. corp. 1| — 2 lin,; 

 1. set. f lin.) 



Eph. brevicauda. Fabricius. — N. G. brevicauda. Steph. Catal. 306. No. 3386. 



Pitchy-brown, or black, slightly shining ; abdomen pale, its base fuscescent ; 

 filaments about half its length, and, with the legs, pale ; anterior femora 

 dusky ; wings whitish, transparent, the costal nervures fuscous. 



Found near London, in June ; and near Cambridge and Whittle- 

 sea Mere, in July 1833. 



fSp. 4. Harrisella. Pallida, alis hyalinis, costa concolore. (Exp. Alar. 6 lin. ; 

 Long. corp. 24 lin. ? 1. set. 1 lin. ?) 



Br. Harrisellus. Curtis, Phil. Mag. 1834. — Ephemeron. Harris, Exp. 

 pi. yi.f. 3. — Cae. Harrisella. Steph. Nomen. 2d edit. Appendix. 



Pale: wings "deadish-white," transparent; costa concolorous. 



Harris says the expansion of this insect is about half an inch : Curtis that it 

 is five lines long. I have never seen a specimen corresponding with 

 Harris's figure, but, if his dimensions are correct, the other must be erro- 

 neous : this latter appears to have been arrived at by measuring the lower 

 figure in Harris's plate, which represents the insect in a sitting position. 



Found by Harris in a window, in London. 



Sp. 6. pennata. Thorace lato fusco ferrugineo, abdomine pedibusque albidis, 

 oculis atris, setis brevibus pennatis. (Exp. Alar. 5 lin.; Long. corp. 2 — Sj 

 lin. ; 1. set. 1 lin.) 



N. G. pennata. Steph. Ca'.al. 306. i\'o. 3387. 



