180 



Sub-genus 2. LEUCTRA. 



Palpi labiales brevissimi. Setae caudales nullae. Tarsorum 

 articuli lus et 3us longi ; 2us brevissimus, subtus parum dilatatus. 

 Alae angust83, pleruraque semicylindro involutae. Parastigmatis 

 venaB X non fingentes. 



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

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



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

 short : no rudiments of tail-bristles : 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. 15. 



Europe. 



9. NEMOUBA GENICULATA. 



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

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



a d. England. 



