184 PERLIDES. 



submedian areolet with one transverse vein. Length of the body 

 l| 2j lines ; of the wings 2 3j lines. 



a e. St. Martin's Falls, Albany River, Hudson's Bay. Presented 

 by G. Barnston, Esq. 



Sub-genus 3. NEMOURA. 



Palpi labiales breves, approximate Abdomen setis nullis api- 

 calibus, maris nonnunquam ungulatum. Tarsi articulis lo et 3o 

 longis, 2o brevissimo. Alae plerumque expanse. Parastigmatis 

 vense X fingentes. 



Nemoura, Pictet, Hist. Nat. New. Perl. 343, pi. 42, f. 6. 



Veins of the parastigma forming a very distinct X : labial 

 palpi short, approximate : abdomen with no rudiments of tail -bris- 

 tles ; that of the male in some cases furnished with two ungulae : 

 first and third joints of the tarsi long ; second very short : wings ge- 

 nerally outspread. 



Div. 1. 



Prothorax obscurus, granulatus, tuberculatus, lateribus rotun- 

 da tis. 



Sub-div. 1. 

 Antennae articulo lo flavo. Alae laete fuscae, fere unicolores. 



20. NEMOURA VARIEGATA. 



Nemoura variegata, Oliv. Enc. Meth. vii. 186, 3. Pictet, Ann. Sci. 



Nat. xxvi. pi. 14 ; Mem. Soc. Phys. Geneve, vii. 179 ; Hist. 



Nat. Neur. Perl. 386, 14, pi. 50. Zett. Ins. Lapp. 1055, 3. 

 Nemoura macrophthalma, Pictet, Mem. Soc. Phys. Geneve, vii. (mas). 

 Semblis pallipes, JBurm. Handb. Ent. ii. 875, 3. 

 Nemura lunata? Ramb. Hist. Nat. Ins. Neur. 461, 4. 

 Nemoura nebulosa? Steph. 111. Brit. Ent. Mand. vi. 140, 1. 



Fusco-nigra ; prothoracis lateribus rufo-piceis ; pedibus pallide 



rufescentibuSjfemoribus posticis annulo obscuro ; alis cinereis ve- 



nis fuscis. 



Europe. 



