180 PEELIDES. 



Sub-genus 2. LEUCTRA. 



Palpi labiales brevissimi. Setae caudales nullce. Tarsoriim 

 articuli lus et 3us lonf?i ; 2us brevissimus, subtus parum dilatatus. 

 AIee angustae, pleruraque semicylindro involutae. Parastigmatis 

 venae X non fingentes. 



Leuctra. Steph. III. Brit. Ent. Mand. vi. 144; Pictet, Hist. Nat. 

 Neiir. Perl. 343, pi. 42, f. 5. 



Veins of the parastigma not forming an X: labial palpi very 

 short : no rudiments of tail-brislles : first and third joints of the 

 tarsi long ; second very short, a little dilated beneath : wings nar- 

 row, long, generally rolled up into a half cylinder. 



Div. 1. 



Prothorax longus, autice et postice contractus. Abdomen su- 

 pra pallide flavum. 



8. Nemoura cylindrica. 



cylindrica, Deg. Ins. vii. 599, pi. 44, f. 17, 19. 



Nemoura cylindrica, Oliv. Enc. Meth. Ins. viii. 186, 4. Pictet, 

 Hist. Nat. Neur. Perl. 366, 7, pi. 47, f. 1—5. 



Europe. 



9. Nemoura geniculata. 



Nemoura geniculata, Steph. III. Brit. Ent. Mand. vi. 145, 1, pi. 31, 

 f. 4. Pictet, Hist. Nat. Neur. Perl. 369. 



a — d. Enffland. 



