1905.] 147 



Subfam. Gomphin^. 



Onychogomphus furcipalus, L. — Sebdou, June 30th and July 2vA, 2 $ 9 • 



Onychogomphus uncatus, Charp. — Teniet-el-Haad, June 13th ; Sebdou, June 

 24th, 25th, and 30tli. A species apparently of rather western distribution, not 

 taken by Mr. Eaton. On the other hand. Miss Fountaine unfortunately missed O. 

 costie and O. genei, which occurred to Mr. Eaton in the more eastern districts of 

 Algeria in April, May, and June, and which formed a very interesting feature of 

 his collection. 



Oomphus lucasii, Selys. — Teuiet-el-Haad, June 14th and 18th ; two <J and 

 two ? . A ? from Sebdou, June 25th, remains a little uncertain. 



Cordulegaster annulatus, Latr. — Sebdou, June 29th and July 9th ; Tleincen, 

 July 14th ; one S on each date. Believed to be new to Algeria, although previously 

 known from Morocco ; a striking form — jirobably the extreme of var. immacuUfrons, 

 Selys. They may almost merit a distinct name, but iny southern material is too 

 small to allow me to pronounce as to this, being confined to a few ^ $ from Digne, 

 Basses Alpes. 



Subfam. ^schnin^. 



JSschna mixta, L.^Teniet-el-IIaad, June 18th, one ? fully mature ; certainly 

 mixta, notwithstanding the early date. 



Boyeria Irene, Fonsc. — Sebdou, June 26t]i till July 8th, a few S S and one $ ; 

 Tlemcen, July 18th, one c? ; a'so new to Algeria. An interesting insect, of build 

 somewhat like the tropical genera Qynacantha and Acanthagyna. Its known range 

 appears to be rather restricted ; Selys, in his 1887 list, gives Southern France, the 

 Iberian peninsula, and the Mediterranean islands. I am not sure what the last may 

 comprise, but the species occurs in Sardinia. 



Subfam. Caloptertgin^. 



Cahpteryx hsemorrhoidalis, Van der L. — Sebdou. A series in mature and 

 perfect condition, chiefly taken on June 25th, but single specimens are dated July 

 6th and August 6th and 13th. 



Calopteryx exul, Selys. — Sebdou, June 25th. A single (J , slightly imperfect, 

 of this most interesting Algerian form. 



Subfam. Ageionin^. 



Platycnemis subdilatata, Selys.— Sebdou, June 25th, 26th, and 30th. A varied 

 series (compare Mr. McLachlan, I. c, p. 156, on the subject of the variation of this 

 species). Miss Fountaine was especially struck with the delicate beauty of the 

 white form, the $ of which has a reddish-brown head and thorax. 



ISCHNURA FOUNTAINE!, 71. Sp. 



(J . Head above bronzed black. Post-ocular spots moderate. Posterior 

 margin of prothorax with the central lobe small and rounded. Thorax bronzed 

 blackish, humeral lines obsolete or obsolescent. Abdomen above daj-k, blackish or 

 greenish-black : segments 1 and 2 with metallic sheen, sides of these segments pale 

 blue; segments 3 to 7 bronzed black, 8 pale blue, 9 and 10 black above. In 



