204 British Dragonflies. 



Linnaeus' description. 



L. alis giaucescentibus, thoracis lineis quatuor flavis. 

 (C. Linnreus, " Systema Natura;," i., p. 544, n. 9, 1758). 



. . LIBELLULA grandis alis giaucescentibus, 

 thoracis lineis quatuor flavis. Libellula grisea, alis flaves- 

 centibus, thoracis lateribus lineis flavis, cauda diphylla. 

 Descr. Duo folia fusca lanceolata, in cauda 

 Abdomen longum, angustum, rufo-fuscum, interdum albo 

 maculatum. In Thoracc lineoLie utrinque du;t, oblique 

 transversales, flava^ ; thorax alias abdomini concolor, 

 hirsutus. Ahc flavescentes macula ferruginea. Est inter 

 maximas. (C. Linnaeus, " Fauna Suecica," p. ^iJl, No. 

 1467, 1761.) 



Size. 



Length of Male, 70mm. to 76mm. ; expanse of wings, 

 96mm. to loimm. Length of Female, 69mm. to 76mm. ; 

 expanse of wings, lOimm to 104mm. 



Male Imago. 



Face yellowish-brown ; labrum and labium of a more 

 russet tinge ; on the top of frons a darker brown crescent ; 

 vertex yellowish-brown. Eyes blue, in contact for a long 

 distance ; behind e}-es a small yellow triangle. Pro- 

 tliorax brown. Thorax russet-brown, with two oblique 

 yellow stripes on each side ; a blue spot at the attach- 

 ment of each of the wings. Legs rather dark brown. 

 Wings suffused with saffron ; all the ncrvurcs russet ; 

 anal angle of hind-wings pointed. Pterostigma russet, 

 narrow, 3'5mm. long. Accessory membrane rather small, 

 whitish. Abdomen rather swollen at first and second 



