Sotne Palaearctic species of Cordulegaster. 277 



black border (proximal) of the labrum does not descend on 

 the sides; the whitish border behind the eyes is broader; 

 the yellow rings of the abdomen are broader and none of 

 them interrupted by a dorsal arete ; that of the 8th is much 

 extended on the sides ; the lateral spot of the 9th larger, 

 and an analogous lateral yellow point on 10th. In some 

 examples one sees a vestige of the black line on the f rons ; 

 in others, the dorsal arete on the ring of segment 8 is finely 

 black. 



The females differ especially from northern examples by 

 the great breadth of the median yellow rings of the abdo- 

 men, which in the 2nd and 3rd segments communicate on 

 each side with the terminal rings in such a way as to isolate 

 a black dorsal spot rounded behind upon the 2nd, pointed 

 on the two sides upon the 3rd ; the 8th segment is variable 

 as to the dilatation of the ring, but this ring is always much 

 interrupted above by the black dorsal arete. The front 

 is very rarely entirely without spot ; there is ordinarily a 

 vestige. The black border of the labrum is incomplete as 

 in the (^. The wings in both sexes are often darkened 

 (smoky at the extremity). In some examples they seem 

 narrower than in the type and the costa externally is of a 

 clearer yellow. (After de Selys.) 



In a series of 9 males from Digne, Basses Alpes, there are 

 two more or less distinct types of pattern, A being much the 

 commoner. In B the yellow markings are more extended, 

 and on the three last segments noticeably so. In 4 males 

 (July 1902, Morton) there is no trace of the frontal line ; in 

 3 of 6 examples (July 1914, Morton) there is a slight trace 

 of this marking. Unfortunately I do not appear to have 

 captured a 2 in this locality. 



In Spain the species is very interesting. 1 fj 2 ^ ? from 

 N.W. Spain {<^, Casayo, 2-8, vii. '06; $9, Vigo, 18-27, vi. 

 '06 ; Branuelas, 10-16, vii. '06, Chapman) are very close to 

 northern C. mi7mlatns. The frontal line is well marked in 

 all ; the sides of the 3 last segments in the females are rather 

 more marked with yellow than in northern examples. 



At La Granja, where the species is abundant at the clear 

 streams there, the males are very similar in appearance to 

 those found at Digne (form A) ; a fair proportion (4 out 

 of 9) having the frontal line marked in varying degrees. 

 A 9 does not differ very greatly from the N.-W. Spanish 

 females, but the yellow rings are rather broader and the 

 frontal line is absent. 



