148 [June,'lf>05. 



segment 3 the bronze is broadest in front, then narrows, ex|jancUng again towards 

 the liind margin ; 4 and 5 rather narrowly black widening towards the hind 

 margin, and in 6 the black becomes rapidly broader, 7 being entirely black above ; 

 the lateral posterior part of 7 and tiie sides of 8, 9, and 10 blue ; under-side of 

 abdomen mainly yellow. The bronze on the upper surface of the middle segments 

 seems to be rather narrower than in the other species. 



In the (f the dorsal tubercle of segment 10 is little raised, but tlie excision is 

 wide. The superior appendages are produced into a long process turned inwardly, 

 these processes being closely approximated but not crossing ; these appendages are 

 blackish above, but beneath they are whitish or pale testaceous. The inferior 

 appendages are large, nearly vertical, with an acute black tooth turned inwards, in 

 some aspects traces of one or two minute teeth ; excepting the teeth, all whitish. 



In the only $ which can be associated with the $, the posterior lobe of the 

 prothorax is distinctly raised somewhat triangular, the apex, however, almost 

 truncate. Segment 1 of abdomen witli an almost square bronzed mark ; 2 with the 

 bronze sliglitly narrowed behind. 



Abdomen, <?, 23 mm. Hind-wing, 15^ — 16 mm. 



Biskra, 2nd April. 



Apparently very distinct from all the other species of Isclinura 

 found in Europe and Northern Africa, the inferior appendages of the 

 cJ being especially different. It differs from /. graellsii in the 

 absence of the dorsal tubercle on the second segment of the abdomen, 

 this tubercle being a character of Isclinura maroccana also {cf. Kolbe, 

 Berliner Ent. Zeitschr. Ed. xxviii, 1884, p. 133). McLachlan (Ent. Mo. 

 Mag., XXV, p. 349), expressed the view that these two species were the 

 same. Be that as it may, neither has anything to do with the present 

 species, and I. lamellata, Kolbe, seems to be equally excluded. 



Ischnura graellsii, Rbr. — Sebdou, various dates, June 23rd to 3Uth. The 

 examples are very similar to others before me from several Spanish localities 

 (received from Father Navas). 



Ischnura sp. ?— Biskra, April 2nd. I am unable to satisfy myself with regard 

 to this form. I submitted two $ to Dr. Ris, who inclines to the view that they do 

 not differ specifically from graellsii. The appendages are very similar, yet I think 

 there are slight differences. Then the posterior margin of the prothorax shows 

 converging pale crests separated by a slight excision, in this respect different from 

 graellsii. The peculiar structure noticeable on the dorsum of the 2nd abdominal 

 segment is also much less pronounced than in graellsii {cf. McLachlan, Ent. Mo. 

 Mag., XXV, p 349). These must remain doubtful until an opportunity arises of 

 studying Isch. genei, to which species, it seems to me, they are allied. 



Fyrrhosoma tenellum, Vill. — Sebdou, August 8th, I ^ . 



Agrion mercuriale, Charp. — Sebdou, June 25th, 1 J . 



Agrion cserulescens, Fonsc. — Sebdou, June 23rd, 2*ith, and 30th. Both sexes. 

 Personally I have not seen Agrion scitulum from Algeria, although it is recorded 



