200 British Dragonflies. 



slightly into hooks ; movable hook sharp and slender. 

 Eyes large, situated at the fore corners of the head, 

 somewhat spherical, with a projection backwards towards 

 the middle line of the head. Occiput rough, rather large, 

 separated from eyes by a curved line ; lateral margins 

 pale and sloping backwards ; a but little raised median 

 carina, and on each side of it a smooth spot ; hind 

 margin concave. Protliorax about as broad as the 

 middle of occiput, swollen somewhat, pale at sides. 

 Leg-basc-proccsses blunt, rough, enclosing a little more 

 than a right angle, posterior a little the longer (Fig. 19, 

 No. 5). Mcso-thoracic spiracles exposed, dark. Thorax 

 mottled at sides. ^-egs rather stout and fairly long, 

 first pair about i6mm., mid- i8mm., hind- 23mm. ; 

 femora with two dark rings, also indicated on tibiae. 

 Wing-cases about 9mm. long. Abdomen enlarged 

 gradually to the seventh segment, then contracting a 

 little more rapidly to the end ; a mid-dorsal whitish 

 line in the basal half of each segment as far as the 

 seventh or eighth, the ground-color darker on each 

 side of it, and containing a fine black oblique streak 

 with a black spot behind it ; on each side of most of 

 the segments two more black spots and two smooth 

 patches ; nine and ten are less ornamented ; the whole 

 of the abdomen above is more or less mottled with 

 various shades of brown ; no dorsal sjjincs ; lateral 

 spines on segments 6 to 9. Upper anal appendage 

 notched at tip ; laterals about half length of lower ones, 

 pointed ; lower ones triangular, jjointed, a little longer 

 than upper one. Female valves long, reaching to the 

 tenth segment. [Chiefly from an empty n^'mjih-case of 

 a female, from which the imago was bred.] Male 



