EPHEMERIS.E. C.ENIS. 61 



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

 times as long as the body, pale fuscous, faintly dotted with fuscous, 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 pallida, pediLus ochraceis, alls lacteis 

 casta fusca. (Exp. Alar. 3^ lin. ; Long. corp. \\ lin. ; 1. set. 4lin.) 



CsB. dimidiata. Steph. Nanien. 2d edit. Appendix — Br. minimus. Curtis, 

 Phil. May. 1834.? 



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

 wings milk-white, costa fuscous. 



Taken near London ; and in Norfolk ? 



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

 base: — Brachygercus, Curtis. 



Sp. 3. brevicauda. Picea-fusca, abdomine pedihusque pallidis, alis albidis, costd 

 fused, setis brevibus. (Exp. Alar. 4 — 4^ lin. ; Long. corp. If — 2 lin. ; 

 1. set. % lin.) 



Eph. brevicauda. Fabricius.—N. G. brevicauda. Steph. Catal. 306. Na. 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, casta concolore. (Exp. Alar. 6 lin.; 

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



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

 pl.vx.f.S. — Cse. Harrisella. Steph. ISlomen. 2d edit. Appendix. 



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



Harris says the expansian 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. 5. pennata. Thorace lata fusco ferrugineo, abdomine pedibusque albidis, 

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

 lin. ; 1. set. 1 lin.) 



N. G. pennata. Steph. Calal. 30b". No. 3387. 



