198 Britisli Dragonflies. 



anal angle ; costal margin brown ; nervures black. 

 Ptei'ostigma black, fairly wide, 3mm. long. Accessory 

 nieinbranc small, pale in front, darker behind. Abdomen 

 swollen at first and second segments, constricted at 

 middle of third, then fairly uniform to the end ; ground- 

 colour dark brown, darker in neighbourhood of spots, 

 sutures black ; first segment, hind mar^-in green, sides 

 yellow ; second, a yellow mid-dorsal lengthened triangle, 

 an interrupted yellow streak across middle, along hind 

 margin four large connected green spots, auricles and 

 sides of fore part of segment blue ; segments 3 to 7 

 with two large green spots on dorsal surface near hind 

 margin separated by median carina, nearer the front 

 margin two smaller triangular ones, more yellow, also 

 separated by carina, a basal transverse yellowish-green 

 line, and on the sides two basal blue spots separated 

 by a black line ; the eighth segment has two small 

 lateral basal spots on each side and a pair of large blue 

 dorsal ones at the posterior end of the segment ; 9 

 and 10 have each one large unbroken posterior blue 

 spot ; on ventral surface are two large basal blue spots 

 on the middle segments. Anal appendages, upper 

 spreading at middle, surface oblique, rounded at end, 

 and terminating with an incurved sharp point ; a 

 yellowish streak down the upper surface ; lower rather 

 long, sharply triangular, slightly truncated at tip. 



Female Imago. 



Face yellow, with an orange tinge. Eyes greenish. 

 Pterostigma brown. Anal angle of hind-wings rounded. 

 Abdomen stout ; but little constricted at third segment ; 

 none of the spots become blue — they only reach )'ellowish- 



