SEBICOSTOMID^E. 83 



2. POTAMARIA ASSIMILIS. 



Nigra ; tibiae tarsique obscure ochracei ; alee fuscce immaculate, 

 anticce cupreo tinctce. Long. 4 5 ; alar. 13 14 lin. 



Potamaria assimilis, Steph. III. Brit. Ent. Hand. vi. 183, 2. 

 England. 



3. POTAMARIA HYALINA. 



Nigra ; palpi, tihice tarsique ochracea ; antennae graciles, fusca ; 

 alee subhyalincB, pallidefuscescentes, immaculatce. Long. 4^ ; 

 alar. 14 lin. 



Potamaria hyalina, Steph. III. Brit. Ent. Hand. vi. 183, 3. 

 England. 



4. POTAMARIA NIGRA. 



Nigra, nigro-pilosa ; abdominis segmentis apice tarsis basi tibiis- 

 que ferrugineis ; alee nigricantes. 



Phryganea nigra, Barnston, MSS. 



Black, clothed with black hairs above, with some tawny hairs 

 beneath : antennae rather short, much longer than the body : breast 

 tinged with gray : hind borders of abdominal segments, tarsi at the 

 base and tibia ferruginous : wings blackish with black hairs. 

 Length of the body 2 lines ; of the wings 7^ lines. 



a. St. Martin's Falls, Albany Kiver, Hudson's Bay. Presented by 

 G. Barnston, Esq. 



Genus 2. SEBICOSTOMA. 



Palpi maxillares maris lati, crassi, hirsutissimi, sursum flexi et 

 fronti adpressi, personati : tibiae anticae et intermediae bicalcaratae, 

 posticae quadricalcaratae : alae anticae radio subcostali in sectore api- 

 cali lo in anastomosi, areola basali una ; areola apicalis la areolaa 

 discalis basim non attingens ; alae posticaB anastomosi antica inter 

 sectorem apicalem 2um et 3um intermpta, exinde areola discali 

 nulla ; anastomosis postica distincta. 



Sericostoma, Latr. Fain. Nat. 439 ; Curt. ; Steph. ; Westw. ; Pic- 

 tet ; Schneider. 



