Orthctnmi. 1 27 



pi. 18, f. I (1845) ; Charp. Lib. Eur. 65, pi. 5 

 (1840.1; Selys Mon. Lib. Eur. i"] (18401; Seh's, 

 Rev. Oclon. 12 (1850); Hai;-, Ent. Ann. 41 

 (1857). Oi-thctniut cauailatiiin, AIcLach. Cat. Brit. 

 Neur. 13 (1870); Kirby S\-n. Cat. Neur. Oclon. 38 

 (1890). Lib. fruinciiti, Miill. Eaun. Eridr. (:)2, n. 551 

 (1764;. Lib. liucolata, Charp. Hor. Ent. 44 (1825;. 



Linnaeus' description. 



L. alis basi immaculatis, abdomine dorso lateribusque 

 intcrruptc lutcis. ( C. LiniKcus, " Systema Natur;v," i. 544, 

 n. 7, 1758.; . . . . Dksc'K. Eacie.s pallida, fronte 

 nigra. Oculi posticc linea flava nigro interrupta. Thorax 

 anticc tcstaccus lineis duabus nigris et lateribus maculi.s 

 duabus fla\'is. Abdomen dorso flavurn utrinque linei.s 

 duabus nigris longitudinalibus et segmentorum marginibus 

 nigris. (C. Linnaeus, " Eauna Suecica," p. ^f}^, n. 1465, 

 1761). 



Size. 



Length of Male, 48'5mm. to 52'5mm. ; expanse of 

 wings, 76mm. to 83mm. Length of Eemale, 49mni. ; 

 expanse of wings, 77mm. 



Male Imago. 



LLcad dark, face paler, eyes blue. Thora.x \'ello\vish- 

 brown, with a lateral black line on each side of meso- 

 notum ; meso- and meta-pleura yellowish, separated 

 by a black line. Lcgx black, with the base of the 

 femora brown. Wings large, h\^aline, about fourteen 

 ante-cubital ner\'ures and nine post -cubital. Ptcrostigma 

 narrow, 2' 5mm. long on fore-wings, 3mm. on hind- 

 wings, black. Accessory mcnibrauc rather long, narrow, 



