THE 



TRANSACTIONS 



OF THE 



ENTOiMOLOGICAL SOCIETY 



OF 



LONDON 



FOR THE YEAR 1870. 



I. On some new British species of Ephemeridse. By the 

 Rev. A. E. Eaton. 



[Bead 3rd January, 1870.] 



In the course of the last year or two, I have met with the 

 following species of our native Epliemeridce, most of which 

 have been undescribed until now. 



With the exception of SipMonuriis armatus, which was 

 found in the collections of Messrs. R. McLachlan and P. 

 C. Wormald, I have seen living specimens of the imago 

 of each of the species described. 



The measurements are given in millimetres ; and in 

 the lengths of the caudal set^e^ the notation "set. 30 and 

 35 — 30 and 36 " indicates that the length of the lateral 

 seta is 30mm. , of the median seta 35 — 36 mm. 



1. Ephemeea lineata. 



Ephemera Danica, Pictet, Ephem. 130, pi. vii (wee 

 Milller) . 



$ . Eyes sooty umber. Thorax above fusco-piceous. 

 Abdomen greenish-gray, tinged with fuscous, at the apex 

 luteous; each of the hinder segments has six longitudinal 

 black dorsal streaks, and two ventral lines : of those there 

 are one short and two long streaks on each side, excepting 

 in the more forward segments where the short middle 

 pair is wanting, and only four streaks remain. Setae 

 fuscous with black joinings; forceps yellowish. 



TRANS. ENT. SOC. 1870. PART I. (MARCH.) B 



