PERLIDE9. 14 



Genus 4. PERLA. 

 Palpi selacei. Alae venosae. 



Perl a, TrVo^roy ; Fair.; Lair.; Ncwmati ; Curt.; Steph. ; Pilet ; 



Burm. 

 Diura, Billherg. 



Maxillary palpi of moderate leu<^th ; first joint short; second, 

 third, and fourth larj^er, not dilated ; fifth sirai;,Mit : inandihles and 

 niaxiilaB of moderate size, or small : wins^s veined, with only a few 

 cross-veins ; eighth abdominal set^ment without an inferior prolon- 

 gation in the female : tail-bristles long. 



Group I. DICTYOPTERYX. 



Caput parvum. Aloe rotundata?. Venae longitudinales soepc 

 irregulares. Regionis submarginalis pars terminalis venis transver- 

 sis divisa. Alarum posticarum regio anjilis magna, plicata. 



Dictyopteryx, Pictet, Hist. Nat. Xeur. Perl. 143. 



Anal region of the hind-wings large, folded ; terminal part of 

 the submarginal region divided by cross-veins ; longitudinal veins 

 of this same part often irregular: head small : maxilUc multiden- 

 tate : wings large, rounded. Colour of the body almost always 

 black, with a yellow stripe on the head and on part of the thorax. 



1. Pkrla. intricata. 



Flava ; prothorax longitiidine multo latins., villa flava ; aht ob- 

 scure fusac, dense reliculaUe., regione submarginali irregulari- 

 ter reticulata. 



Perla intricata, Pictel, Hist. Nat. Xeur. Perl. 1 J2, 1, pi. 7, f. 1— s. 

 Jiximb. Hist. Nat. Itis. Neur. 452, o. 



Chamounix. 



2. Pi:rla microcephala. 



Flava; protlwrax lorKjitiulinc mullD latino, villa Jlavu; uLc pallidc 

 fuscft, mediocriter reticulaUe. 



Perla bicaudata ? Linn. Sysl. Nat. ed. 12, OOX, 1. Faun. Suec. 

 14H9. Gmel. ed. Si/st. Nat. i. 2(>31, 1. Barbut, Gen. 216. 

 Berk. Si/n. i. 150. Stew. Elem. Nat. Hist. ii. 213. Turt. Syst. 



