46 EEV. A. E. EATON ON RECENT EPHEMEEID^ OR MAYFLIES. 



Polymitarcys [type] virgo, Etn., Ent. Mo. Mag. v. 84. (1868, Aug.) ; Traus. Ent. Soc. Lond. (1871), 

 60, pi. i. 5 & iii. 15-15 b [details] ; Palmeu, d. Morphol. d. Traclieensyst. sect. i. pp. 1-21, taf. i. 1-7 

 (1877) ; Mocsary [vide Ephtmerum under citations for Palingenia longicauda (1878)] ; Rostock, 

 Jahresber. d. Vcr. f. Naturk. Zwickau, 1877, p. 81 (1878); Vayssiere, Ann. Sc. Nat. (6), Zool, xiii. 43, 

 figs. 9-12, & 80-80 bis [nymph] (1882). 



Adult {in life), 6 . — Head whitisli, tinged with grey above, the oculi and bases of the 

 ocelli black, tlie hinder ocelli met interiorly by a fine curved fuscous line. Pronotum 

 whitish, clouded more or less with grey, and on its front edge in two places on each 

 side tinged with sepia-grey. Meso- and metathorax pale brown-ochreous or lutescent, 

 their peaks and the decurrent membranes of the wing-roots whitish. Abdomen 

 whitish, the dorsum clouded more or less with grey, especially at the tips of the 

 segments, the last two ventral segments and the peuis somewhat ochroleucoiis. Seta3 

 and forceps white, the former pellucid, with opaque joinings. Wings white, the costa, 

 subcosta, and radius of the fore wings grey. Legs white, the fore legs with a longitu- 

 dinal streak from the base outside the coxa, the femur (all but the back of the knee) 

 and the tibia blackish. The body of the 2 is more completely pale brown-ochreous, 

 before the eggs are discharged; afterwards the emptied abdomen is of a pale warm 

 sepia-grey. Length of body, <s 10-11, ? 16-17 ; wing, <s 11-12, ? 10 ; setse, <S im. 

 30-33, subim. 16, ? adult 13 mm. 



Bab. In Europe, from Madrid, France, and the Netherlands, eastwards, inhabiting 

 the chief rivers {e. g. the Seine at Paris, the Rhone at Lyons and Avignon, and the 

 Garonne at Toulouse) ; perhaps in Morocco as well. During the last and the first 

 quarters of the moon at the end of August and the early part of September, " la manne" 

 occasionally swarms late in the evening over the water. Dr. E. Joly narrates the in- 

 vasion of a milliner's shop by them at Toulouse, — the flies thronging to the gas-burners 

 and actually quenching the flames. Pictet's figure of the 6 fore leg is incorrect ; he has 

 given a fifth joint to the tarsus (seemingly by dividing the first jonit) and has exag- 

 gerated the inequality of the ungues. Doubtless his subjects were dried. 



Polymitarcys Savignti, Pict. 



Ephemera, Sav., Descript.de I'Egypt. Hist. Nat. i. 191 [cxplic. ic.], ii. Nevropt. 5 (1817). 

 Palingenia Savignyi, Pict., Hist. Nat. Nevro[it. ii. Eplieni. 157 [uudcscribed] (1843-5) ; Walk., List of 

 Neuropt. Ins. in Brit. Mus. part iii. 550 [undescr.] (1853). 



PvUjmitarcys Savignyi, ! Etn., Trans. Ent. Soc. London (1871), Gl, pi. iii. 10, 16 a [details]. 



Imago {dried), 6 . — Pronotum warm sepia-grey, with a longitudinal median line and 

 the front and lateral edges black ; meso- and metathorax light brown-ochreous, probably 

 varied above with warm sepia-grcy (the specimen is eroded). Abdomen beneath and at 

 the sides of the palest yellow ochre, becoming light brown-ochreous in segments 8-10 ; 

 above, segments 1-7 are broadly shaded with light Vandyke-grey, with the edges of the 

 dorsal vessel darker, and the joinings broadly whitisli ; in segments 8-10 the grey gives 

 place to light Vandyke-brown, which in certain positions changes to violet-grey, and the 

 sides of the segments are concolorous with the venter. Seta) and forceps white. Pore 

 femur above, and the tibia, viewed in certain directions, violet-grey ; the tarsus whitish ; 

 hinder legs with very pale yellow-ochreous femora, and the remaining parts whitish. 



