PERLIDF.S. 14."5 



Pf.rl.v VENTR.AI.IS. 



Fusca ; prothorax hnujitud'me vix lad us, vitta Jlava ; ala- limpidtt, 

 apud costam Lite Jlav<r. 



Perla ventralis, Pictet, Hist. Nat. Xrur. Perl. 161, o, pi. 8, f. 8, 9. 



Balkan. 



8. Perla iMHorrii, 



Lictc fusca ; prothorax non vittatus. 

 Perla Imboffii, Pictet, Hist. Nat. Neur. Perl. 1G6, 0, pi. 0, f. 9, 10. 

 Basle. 



Group 2. ISOGENUS. 



Nigra, vitta flava. Ala? macula apud stiijma nebulosa ; vena 

 subcostalis accessoria valde raniosa et irregularis ; regiouis sub- 

 marginalis pars tonniualis veiiis trausversis nou divisa. Alae pos- 

 ticcE regione auali magna, plicala. 



Isogenus p., Newman, Ent. Mag. i. 415. Sexuum amborum alis 

 pariier repandis, pariterque abdomen legentibus ; lelo setis 

 duabus inslructi). 



Nejdielion, Pictet, Hist. Nat. Neur. Perl. 144, 3. 



Terminal part of tbe submarginal region witbout cross-veins ; 

 accessory vein of tbe subcostal vein mucb ramified and very irregu- 

 lar. Species wilb a black body, wbicli bas almost always tbe yellow 

 strij)c, witb tbe likeness of Dicti/opterj/x ; tbey are also cbaracterized 

 by a lilackisb clouflod spot on tbe side where tbe principal line of 

 the cross-veins terminates. 



9. Pi:ri,a nluecula. 



Caput macula Jlava acripitali ; frntis nmuiiio }iii/ra ; prallunax 

 lomjitudine paullo latius, vitta Jlava ; altc autictc snrdiile In/n- 

 lime, nubecula coslali ultra medium fusca. 



Perla bicaudala, St. Farg. et Serv. Enc. Meth. Ins. x. 69, 1. Dum. 



Cons. GSn. Ins. pi. 27, f. 10. Pirtet, Ann. Sci. Nat. xxviii. pi. 



(), f. 6, 7. liurm. JIandb. Fnl. ii. 87H. 

 Perla nubecula, Pictet, Hist. Nat. Neur. Perl. 170, 7, j)l. 9, f. 1 — (J. 



