96 Britisli Dragonfiics. 



Immature Colouring^. 



The male closely resembles the female, the markings 

 in both being bright }-ello\v, and distributed as in the 

 adult female. The coxa; are yellow also. The ptero- 

 stigma is pale yellow between black nervures. L. 

 pallidistignia of some authors is evidently an immature 

 form of this species. De Selys says * that Hagen 

 often noticed the pairing of specimens with pale ptero- 

 stigmata, in which case consequently the male was not 

 black. The difference in appearance between mature 

 and immature males is most striking, and, unless care 

 is used, will lead to confusion with those not much 

 acquainted with the genus Syuipctruui. 



Variation. 



Size is rather inconstant in this species. In other 

 respects the male does not exhibit much variation. In 

 the female the distribution of the yellow markings on 

 the abdomen varies to some extent, as does also the 

 amount of saffron suffusion on the wings. Sometimes 

 this spreads a little along the costal region of the 

 fore-wings, and even becomes slightly more intense 

 near the cubital point, as in S. flaveoliim. I have a 

 female in which a good part of the fore-wings is tinged 

 with brown, as in old specimens of S. striolatiiiii. 



Oviposition. 



The method of procedure resembles that of .S". strio- 

 latum, and is fully described in De Selys' " Revue des 

 Odonates," pp. 344, 345. 



* "Revue des Odonates," p. 49. 



