OrtJictnnn. 123 



Leach Edinb. Enc. ix. 136 1815. Lib. opaliiia, C'harp. 

 Hor. Ent. 45 : 1825;. Lib. olyuipia, Eonsc. Ann. Soc. Ent. 

 Erance, \i. 139, t. 6, f. 1-2 11837); Seh's Mon. Lib. ICur. 

 40 (1S40) ; Ramb. Ins. Nevr. 67 (1842). Lib. dnbia, Ranib. 

 Ins. Xcvr. Gj (1842). 



Fabricius' description. 



L. alis li}-alinis : stig'matc mar!j;inali fusco, corpore 



c?erule.scente Media. Os naxescens fronte 



nigricante. Corpus civrulescens, immaculatum. Al;e basi 

 imniaculata.'. Eabricius, " Entomoloi^'ia Systematica," 

 Supplement, p. 285, 1798). 



Size. 



Len!7th of Alale, 41mm. t(j 43'5mm. ; expanse of winijs. 

 5gmm. to 02'5mm. Len;j;'th of Eemale, 4onHn. to 42mm. ; 

 expanse of uins^s, yj"^ to ()2mm. 



Male Imag-o. 



Head and face yellowish-brown, darker on the vertex. 

 Eyes dark ash}--blue, in contact but a short distance. 

 Thorax \ery dark brown, slighth' powdered with blue 

 behind ; two conspicuous pale \-ello\\ish-blue dorsal lines, 

 three broad, oblique, lateral, yellow ones; prominences 

 between wings }'ellow. Legs stout, ver\- dark. \Vi)igs 

 hwaline, costal ner\ure \-ellow, about tweh'c ante-cubital 

 nerxaircs, about ten post-cubitals. Pterostigiiia orange, 

 outlined \\ith a strong black nerxure, rather oxer 3mm. 

 long. Aeeessory i/ieinbraue small, narrow, whitish. 

 Abdoinen narrow, somewhat flattened, but witli a mid- 

 dorsal keel, poxx'dered with blue, two tin\- dorsal black 

 transx'erse lines on segments 3 to 8 in the posterior 



