British Drcxgonflies. 



vertex brownish, preceded by a black line descending 

 along the eyes ; behind the eyes bright yellow, with a 

 brown-black band at each end of the yellow patch, and 

 one intersecting it. Prothorax blackish, russet behind, 

 hairy at the margin. Thorax downy, red, with the raised 

 prominences carmine, interspersed with dull black. Sides 

 red, with two irregular yellowish bars, one about the 

 centre, the other basal These bars have sometimes a 

 bluish tint. Between the bars and the legs is a small 

 bright blue patch. Wings hyaline, nerviircs carmine, 

 becoming darker after death, a saffron patch at the 

 base of the hind-wings, sometimes also indicated 

 on the fore- wings. Accessory membrane rather 

 small, white. Ptcrostigma yellowish to pale reddish- 

 brown, enclosed within two strong black nerxures. 

 3mm. long. Legs black at sides, yellowish-brown in 

 centre, tarsi black. Abdomen c}'lindrical, not constricted 

 at the third segment, blood-red, fading to brownish-red 

 after death. The base of the first segment is black, 

 followed by a thin red line, this again being succeeded 

 by a black patch extending over about half of the second 

 segment in front, but extending dorsally back into a 

 point. In some specimens there is a small black dorsal 

 spot at the commencement of the third and fourth 

 segments. A black dorsal blotch on segments 8 and 

 9 extends over nearly the whole length of the segment. 

 On each side of segments 7, 8, and 9 is a lateral black 

 streak. Appendages superior, scarlet, almost as long as 

 the last two segments, slightly elbowed, with about 

 ten black points beneath, tips black ; inferior, nearh- 

 triangular obtuse, yellowish, blackish towards ti}j. 

 (Mr. C. A. Briggs' description from Surrey specimens.) 



