i8fiy.] 5 



in Centropt. pennulatnm, Etn. Length of wing, 5 mm. 



During life (to the best of my recollection after a lapse of 

 six years) the turbinate eyes are reddish-chocolate brown, and 

 the apical joint in the forceps limb was less slender than in 

 I < A:t.m^M Centropt. pennulatum — in fact comparable to its counterpart 

 in Cloeon simile {cf. Trans. Linn. Soc. [2] Zool., vol. 3, pi. xvii). 



Hab. — Tizi-Ouzou ; near the village of Tissadourt, about an 

 hour's walk 8. W. of the town 1 ^ and 1 ? im., November 4th, 1S92), 

 and Mirabeau (6 ^ im., November 5th, 1892). 



Rather like Centropt. tenellum in colouring (except in having un- 

 handed femora), but in no way related thereto as a species. 



Centeoptiltjm sp. — Biskra (1 ? im., April 16th, 1894.). 



Cloeon DiPTERtrM, Linn. — Ain Sefra, Oran (1 i and 1 ? im., Bleuse) ; Algiers, 

 {Lucas). Occasionally found in hotels, resting on walls or curtains, at Algiers, 

 Azazga, Constantine, Bone, and Biskra, often entering as subimago to moult. Males 

 sometimes assemble over the Route de la Corniche in the gorge of the Roumrael at 

 Constantine. Streamlets of strongly brackish water in the neighbourhood of 

 Hammam-es-Salahin, near Biskra, are inhabited by the nymphs. See Ent. Mo. 

 Mag., June, 1895. p. 144. 



Cloeon EUFtrLUM:, Miil. — Constantine ; near the confluence of the Roummel 

 and the Alerzoug (1 :? im., October 17th, 1895) ; Le Tarf (on the road between 

 Bone and La Calle), at a " krelidge " (1 $ im., June 29th, 1896). Lac Tonga, near 

 La Calle ; abundant at the base of Koudia Deidei, assembling over the edge of the 

 marsh bordering the lake (4 $ im., July 16fch, 1896). Biskra (1 ? im., April 18th, 

 1894). 



Rhitheogena. sp. . — Biskra ; near the market garden above the barrage 



(1 S im., March 19th, 1895). The occurrence of an insect of tliis genus in this 

 locality is noteworthy, and is suggestive of the possibility of its having travelled 

 down from the higher valleys penetrating between the spurs of the Aures. 



EcDYUETJS FLUMINUM, Pict. {angustipennis, Ramb.). — Biskra; common a little 

 above the barrage over the swifter parts of the stream, ranging to and fro rather 

 close to the surface of the water, about 6 p.m. In the adult fly the 1st joint in the 

 <J fore-tarsus is not quite half the length of the 2nd joint [e. g., as 12 is to 25] (1 

 (? im., April 14th and 16lh, 1894; 4 S im., March 26th, 1897). 



EcDYUEUS TEN'OSUS, Fab, var. ?. — Constantine; occasionally met with on 

 slopes dominating the Roummel at moderate distances from the water. 1st joint in 

 the adult ^ fore-tarsus two-thirds the length of the 2nd joint \e. g., as 12 is to 18] 

 (1 $ im., October 3rd, 1893 ; 2 $ im., 1 $ subim., May 18th and 20th, 1895, 

 respectively). 



The lateral stripes of the abdomen are evanescent, and in the pterostigmatic 

 region of the fore-wing the cross veinlets do not anastomose so freely as to form two 

 regular rows of cellules ; but in other respects the imago resembles E. venosus. The 

 subimago has wings of rather a different tint from the typical form of this species. 



Seaton, Devon : October, 1 898. 



