SERICOSTOMIU.E. 83 



2. POTAMARIA ASSIMILIS. 



Nigra ; tibia; larsiqne obscure ochracei ; alcB fusccp immaculatCBy 

 anticcB cupreo tincUc. Long. 4 — 5; alar. 13 — 14 lin. 



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



England. 



3. Potamaria uvalina. 



Nigra ; palpi, tihicc tarsique ochracea ; antenncB graciles, fuscee ; 

 aUe subhi/alina, pallide fuscescentes, immaculatce. Long. 4-^ ; 

 alar. 14 lin. 



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



England. 



4. Potamaria nigra. 



Nigra, nigrn-pilosa ; abdominis segmentis apice tarsis basi libiis- 

 que ferrugineis ; alee nigricantes. 



Phrygauea nigra, Barnston, MSS. 



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

 beneath : antenna? rather short, much longer than the body : breast 

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

 base and tibi® ferruginous : wings blackish with black hairs. 

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



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

 G. Barnston, Esq. 



Genus 2. SERICOSTOMA. 



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

 fronti adpressi, personati : tibiae antica; et intermedia; bicalcaratae, 

 postica; quadricalciuratffi *. ala3 anticae radio subcostali in sectore api- 

 cali lo in anastoraosi, areola basalt una ; areola apicalis la areolae 

 discalis basim non attingens ; alae postica' anastomosi antica inter 

 sectorem apicalera 2uin et 3iim interrupta, exinde areola discali 

 nulla ; anastomosis postica distincla. 



Sericostoma, Latr. Fam. Nat. 439 ; Curt. ; Steph. ,• U'estw. ; Pic- 

 tet ; Schneider. 



