504 British Dragonjlies. 



middle lobe obtuse-angled, margin serrated ; palpus with 

 inner margin serrated ; distal margin notched, and with 

 a sharp, internal point ; movable hook rather short, sharp. 

 Occiput rather narrow; sides slojDing much backwards; 

 corners rather rough ; hind-margin \ery concave. Pro- 

 thorax somewhat pentagonal ; lateral corners rather sharp 

 and dark. Thorax fairly smooth, and uniform in tint. 

 ]Viug-cascs about 5mm. long, reaching about to the 

 end of the fourth segment. Legs of moderate length ; 

 fore- about 7mm., mid- 8mm, hind- iimm.; sometimes 

 indications of a ring near distal end of femora ; 

 distal end of tibia; and tarsi rather darker ; several 

 longitudinal lines of rough points ; no hairs visible in 

 dry specimens ; rather longer spines on tibiae and 

 tarsal joints. Abdomen with a slightly paler line 

 along each side ; a mid-dorsal, broad, dark line on all 

 the visible segments except the tenth, containing a large 

 elliptical, or pear-shaped pale basal spot, this spot 

 having in its centre a longitudinal still paler line ; on 

 the sutures two mid-dorsal dark spots, with a fainter 

 one on each side ; upper surface of abdomen with 

 numerous small rough points ; end of tenth segment 

 triangular, apex being dorsal and raised somewhat, 

 margin with a ring of points. Caudal laiiicllic 5-5mm. 

 long, broad, sharp-pointed ; trachea; much-branched and 

 conspicuous ; a dark cross-line a little beyond the 

 middle of each lamella, and generally a fainter one 

 more distal and parallel to it ; margin spin}' along the 

 basal part as far as the cross-line, hairy round the 

 distal part (Fig. 54). [Bred on several occasions, and 

 empty nymph-cases found when the imagines were 

 emerging.] 



