292 British Dragonflies. 



macLilis dorsum fere implentibus, in medio paullulum 

 angustioribus. (T. de Charpenticr's " Libellulinae 



Europaeae," p. 159, t. 42, f. 2.) 



Size. 



Length of Male, 27mm. to 31mm. ; expanse of wings, 

 31mm. to 35"5mm. Length of P'emale, 29mm. to 31mm. ; 

 expanse of wings, 35mm. to 39mm. 



Male Imago. 



The Head resembles that of A. puclla, except that 

 the blue spot behind the eyes is almost round. Pro- 

 tJiorax blackish-bronze, with a blue spot on each side, 

 and a blue border on all four sides, but slightly inter- 

 rupted at the middle of the hind margin. The mcso- 

 and JHcta-thorax also closely resemble the same parts 

 in A. piiclla. Legs black above, blue below. Wings 

 hyaline ; pterostigma diamond-shaped with blackish 

 centre, succeeded by a hyaline ring, and that by a black 

 border. Abdomen blue above and below, marked with 

 black-bronze on the upper surface, as follows : On 

 the first segment a squarish black spot, on the second 

 one resembling the usual sign for the planet Mercury 

 (Plate XXVII., c) ; the next four segments have spots at 

 the hinder end, prolonged in front into a lanceolate 

 point in the third and fourth, and sometimes in the 

 fifth, and even the sixth. The seventh segment is 

 almost entirely black, and the eighth is blue, usually 

 with two tiny spots ; the ninth has the posterior half 

 black, bordered behind with blue ; and the tenth is 

 black, notched behind, and there edged with blue. The 

 appendages are about as long as the tenth segment, and 



