^ [Jainuuy, 



LIST OF EPIIEMERIDM HITHERTO OBSERVED IN ALGERIA, 

 WITH LOCALITIES. 



BY THE REA'. A. E. EATON, M.A., F.E.S. 



The species of Ephemeridce indicated in this ai'ticle as natives of 

 Algeria probably represent two-thirds of the May-fly constituents of 

 the fauna of that country, taking a liberal estimate of the number 

 likely to be indigenous. Only one species of wide geographical dis- 

 persion has been recorded (in Lucas' "Exploration Scientifique ") aDd 

 the additions here made to the list were not obtained as the result of 

 any especial attention directed to this Family on the part of the col- 

 lector ; they should be reckoned merely as the outcome of casual 

 observations by a trained ej^e. The method of keeping specimens alive 

 for description and for delineation of details under the microscope 

 was not resorted to, insects of other Orders being the principal 

 objects of quest. AVhere the collector is not specified, the writer was 

 the captor of the species. 



PoTAMANTiius LTTTEUS, Linn. — Constantine ; near a ford of the Roumiuel 

 about two miles south of the town (1 (J im., May 29th, 1895). 



Habrophlebia modesta. Hag. — Bone ; beyond the Orphehnat, near the con- 

 fluence of the Cha Bellareou and the Oued Deb (3 <? iui., May 11th, 1896). 



Habrophlebia sp. — Azazga (1 $ im., September 2nd, 1893). 



C^Nis halterata, Fab. — Biskra ; abundant along the conduit and by the 

 river towards the barrage (10 ex.. May 17th, 1^93 ; 1 ex., February 2nd, and 1 ex., 

 February 7ih, 1894; and 1 ex., April 16th, 1895). In the desert near Hamman-es- 

 Salahin, 1 $ ex. was found upon the surface of a brackish streamlet. 



Baetis ehodani, Pict. — Blida (1 $ im., February 28th, 1893) ; other smaller 

 examples from Frais Vallon, near Algiers (October 27th, 1892), and Tizi-Ouzou 

 (November 8th, 1892) are doubtful. 



Centroptiluji luteolum, Mill. — Bone ; stream at the foot of the mountain 

 beyond the Asile des Veillards (1 <? im., April 7th, and another May 3rd, 1896). 



Centeoptilum algiricum, sp. Hov. — Imago (dried). — Thorax above pitch- 

 black. Dorsum of abdomen pitch-brown, translucent in segments 2 —6 ; setae and 

 forceps (all but the basal joints of the latter, which are brownish) whitish. Fore- 

 leg umber-, or light pitch-brown, more ti'anslucent in the tibia and tarsus than in 

 the femur ; hinder-legs with slightly amber-tinted femora, and whitish tibiae and 

 tarsi. Wings vitreous ; the principal longitudinal veins very faint whitish-amber 

 tinted from some standpoints, with the roots of the subcosta and radius browner, 

 and with about six (!• to 8) usually simple and almost straight oblique cross-veinlets 

 in the ptcrostigmatic region of the fore-wing. Hind-wing and forceps somewhat as 



