Efiallagma. 299 



segmenti anticum tangit. Ultima duo segmenta in 

 medio dorso atra. Appendices marium superiores 

 brevissimae, \ix extra abdomen conspicuae, globulares, 

 subpilosae, fuscae. Inferiores longiores, laterales cur\'atae 

 cylindricae, atrae. Foeminarum appendices brevissimae, 

 conicae, obtusae, et fiit videtur) cocrulescentes." (T. de 

 Charpentier's " Libellulinae Europaeae," p. 163, pi. xlii., 

 f. I, 1840). 



Size. 



Length of Male, 31mm. to 33mm. ; expanse of wings, 

 36mm. to 39mm. ; Length of Female, 29.5mm. to 33mm. ; 

 expanse of wings, 37mm. to 40mm. 



Male Imago. 



Head blackish-bronze above, face and eyes blue ; two 

 pear-shaped blue spots on the occiput, with their tails 

 pointing towards the middle line. ProtJiorax triangular, 

 rounded behind ; it is bordered in front with blue, and 

 much more narrowl}- behind, while there is a blue spot 

 on each side. Mcso- and mctcx-tJwrax blue, the upper 

 surface of the former with three black bands, a broad 

 medio-dorsal one, and a narrower one on each side. 

 Wings hyaline ; the diamond-shaped pterostigma black. 

 Legs black above, greenish-blue below. Alwioineii blue, 

 with bronze-black markings, whose arrangement will be 

 best seen from the figure. The second segment bears an 

 elliptical spot (Plate XXVII., /;;, usuall)- connected with 

 the hind marginal circlet, this spot affording a read}' 

 means of distinguishing the species. I^owqv anal appeudages 

 rather long and slender, turned in at the point, which is 



