CH. IV] DRAGONFLIES 117 



(32) 30. Eyes separate from one another. 



31. Sub-family GOMPHIN^E. Females devoid of ovipositor. 

 Ground colour black, with longitudinal yellow markings. 

 Sole British genus and species Gomphus vulgatissimus, 

 Linn. Length 49 mm. Expanse of wings ^ 62 mm., 

 9 68 mm., approximately. 

 (30) 32. Eyes meeting. 



(34) 33. Sub-family CORDULEGASTERIN^E. Eyes meeting at a 

 point only : females with ovipositor. Ground colour 

 black with transverse yellow markings. 



Sole British genus and species Corduleg aster annulatus, 

 Latr. Length ^ 75 mm., $ 85 mm. Expanse of wings 

 $ 92 mm., $ 100103 approximately. 



(33) 34. Sub-family ^SCHNIN^E. Eyes meeting for some distance : 



females with ovipositor. Genera Anax, Brachytron, 



(36) 35. Abdomen not spotted. 



genus Anax. Abdomen with black mid-dorsal line of 

 irregular width, <$ abdomen blue, $ green : anal angle 

 of hind- wings of <$ rounded: no "auricles." 

 1 species : A. imperator, Leach. Length of 77 mm., 

 9 74 77 mm. Expanse of wings, (104 mm., $ 102 

 108 mm. 



(35) 36. Abdomen spotted. 



(38) 37. genus Brachytron. Abdomen with spots, some blue, some 

 yellow. Thorax and anterior abdominal segments, dense, 

 covered with pale hairs. Pterostigma very narrow. Anal 

 angle of hind-wing of $ bluntly pointed. Ventral anal 

 appendage of < slightly notched at apex. 

 1 species : B. pratense, Mull. Length of $ 57 '5 mm., 

 $ 54*5 mm. Expanse of wings <$ 71*5 74 mm., 

 ? 74 mm. 



(37) 38. genus JEschna. Abdomen variously spotted. Pterostigma 



of moderate width. Anal angle of hind- wings of $ dis- 

 tinctly pointed : ventral anal appendage of $ pointed. 

 6 species : 



(48) 39. Abdomen nearly black, with blue or yellow spots. Wings 

 clear, not coloured. 



