XVIIl] 



BRITISH SPECIES 



345 



2-5, black, pointed ; inf. triangular. ? abd 26 28, hw 3031, pt 3-5. Wings 

 slightly suffused. Thorax brown; abd. brown or yellowish, with darker 

 mid-dorsal line; apps. 1-5 pointed. Local; Southern. June Sept. 



19. O. canceUatum Linn. 3 abd 30 31, hw 37 38, pt 2-5, dark; memb. 

 greyish -black. Two cell-rows between Ms and Rspl. Thorax brownish; 

 abd. blue in adult, with tip darkened; abd. broader than in No. 18. App. 

 sup. 2-5, black; inf. triangular. ? abd 31 32, hw 39 40, pt 3. Abd. brown 

 or yellow, with two black dorsal bands ; apps. short, black. Local ; Southern. 

 May July. 



Tribe Sympetrini (Characters, p. 270). 



Genus XL Sympetrum Newman (fig. 133) ( =Diplax Charpentier) 

 (fig. 176). Fw with less than 10 Ax, the last incomplete. No dark patch at 

 base of hw, but frequent saffroning. Disc, field of fw narrowed towards wing- 

 border. Sectors of arc. united in both wings. Abd. not dilated. Important 

 specific differentiation of hamuli on seg. 2 of <$, and of v.v. of ?. 



Fig. 176. Lateral view of appendages of second abdominal segment in the males 

 of Sympetrum. A. 8. striolatum Charp. B. 3. imlgatum Linn. c. 8. fons- 

 colombei Selys. D. S. sanguineum Miiller. E. 8. danae Siilzer. F. S. 

 flaveolum Linn. Original (except F, drawn by Mr H. Knight). 



20. S. striolatum Charpentier (fig. 133). 3 abd 2729, hw 2729, pt 2-5, 

 reddish. Wings just tinged with saffron at bases; venation reddish-brown. 

 A black line between vertex and frons, not extending to eyes. Thorax brown, 

 hairy. Abd. red, 3 8 with small black spots posteriorly, 8 9 with mid-dorsal 

 black spot. Hamulus with long straight inner branch (fig. 176 A). $ similar, 

 but abd. brown with larger black markings. V.v. not prominent, notched. 

 Very variable species. (S. nigrescens Lucas, 1912, is a variety superficially 

 resembling No. 25.) Very common. June Nov. 



21. S. vulgatum Linn. <$abd26 27, hw 27 28,pt2-5. Closely resembles 

 No. 20, but darker in colour. Black line between vertex and frons extends 

 downwards alongside the eyes. Hamulus with short hooked inner branch, 

 not so long as outer branch (fig. 176 B). V.v. of $ very prominent, not notched. 

 $ abd 24 25, hw 27 28, pt 2-5. Rare; Southern. July Sept. 



22. S. fonscolombei Selys. <$ abd 28 29, hw 29 30, pt 3, yellow or 

 reddish. Venation red. Hw with a small saffron patch at base. Hamulus 



