CH. IV] DRAGONFLIES 115 



13. S. striolatum, Charp. Dorsal surface of abdomen of ^ 



red with yellow spots near hind margin of segments. 

 Length of $ 3944 mm., <j> 39 42 -5 mm. Expanse 

 of wings 56 62 '5 mm., $ 5863 mm. 



14. 8. fonscolo?nbii, Selys. abdomen crimson : nervures of 



wings of both sexes crimson. [A very rare visitor.] 



15. 8. Jtaveolum, Linn. <$ abdomen dull red, base of wing in 



both sexes suffused with rosy yellow. [An occasional 

 immigrant.] Length of 31 37 mm., $ 33 mm. 

 Expanse of wings 48'5 60mm., $ 56mm. 



(12) 16. Legs black. 



(18) 17. 8. sanguineum, Mull. Abdomen of $ crimson and dilated 

 posteriorly, of $ yellowish olive with red mid-dorsal 

 line. Pterostigma dark red in both sexes. Length of 

 ( and $ 33 36 mm. Expanse of wings $ 50 57 mm., 

 <j> 5358 mm. 



(17) 18. 8. scoticum, Don. Abdomen of $ almost black and 

 dilated posteriorly, of 9 yellowish brown, with black 

 mid-dorsal line. Pterostigma black in both sexes. 

 Length of $ 3134 mm., $ 27'5 33 mm. Expanse 

 of wings $ 48 51 -5 mm., $ 42*5 52mm. 



(11) 19. Antecubital nervures about 12. 



genus Orthetrum. Male abdomen blue in anterior part 



at least. 

 2 species : 



(21) 20. 0. ccerulescens, Fabr. Pterostigma yellow. Abdomen of 

 ( entirely blue, of 9 yellowish brown. Wings of 

 $ yellowish near base anteriorly. Length of 41 

 43'5 mm., $ 40 42 mm. Expanse of wings < and 

 ? 5962-5 mm. 



(20) 21. 0. cancellatum, Linn. Pterostigma black. Abdomen of 

 <J blue anteriorly, black posteriorly, of $ yellow with 

 black lateral lines. Length of <$ 48'5 52*5 mm., 

 9 49 mm. Expanse of wings < 7683 mm., $ 77 mm. 



(3) 22. Sub-family CORDULIIN^E. 2nd abdominal segment of 

 males provided with a pair of small projecting flaps 

 "auricles" and inner margin of hind-wing concave in this 

 sex. Appendages of 10th abdominal segment of male 





