64 British Dragouflies. 



ScLitcllum flavum. Abdomen nigrum : primum seg- 

 menting margine postico ; 2. fasciis duabus et macula 

 utrinque ; 3. 4. 5. 6. 7 macula dorsali, luteis. Appendices 

 anales nigral, superiores duobus ultimis segmentis 

 abdominis conjunctis paulo breviores ; inferior his 

 dimidio bre\ior. Pedes nigri. Ake alb;e, callis luteis, 

 macula marginali subquadrata fusca, membranula ac- 

 cessoria alba ; antica; puncto, postica^ puncto et macula 

 triangular! baseos nigris. . . . Long. 13-14. lin. extens. 

 alar. 26. lin, . . . Feminam non vidi. . . . Obs. 

 Haec species forsitan vera L. riibiciuida Linna^i est, 

 cujus descriptio illi satis convenit : sed nimia ejus 

 brevitas judicium certum ferre non sinit (P. L. Vander 

 Linden, " Monographi;u Libcllulinarum Europi^arum 

 Specimen," 16, 1825.) 



Size. 



Length of Male, 35-5mm. to 39mm. ; expanse of 



wings,* 53mm. to 58mm. Length of P'emale, 34mm. to 



36mm. ; expanse of wings, 52mm. to 55mm. 



Male Imago. 



Head. Face pale yellow, with black hairs ; labrum 

 narrowly edged with black ; labium black ; vertex black, 

 preceded by a broad black line extending along the side 

 of the eyes ; eyes blackish-brown, ashy-green beneath. 

 Thorax black, clothed with palish hairs ; on the front of 

 thorax two broad, longitudinal, crimson stripes, almost 

 interrupted towards the posterior end ; several other spots 

 and lines on the sides ; prominences between the wings 

 crimson. Wings hyaline, a triangular dark brown spot 



* " Exjmnsc of wings" in all cases refers to hiiul-wings. 



