SERICOSTOMIDiE. — POTOMARIA. 183 



robust^ obtuse, somewhat elongate : legs rather short and slender ; anterior 

 tibiw without spurs, intermediate with a pair at the apex, hinder with a pair 

 at the apex, and a second pair considerably below the middle. 



These insects may be known by having the anterior tibiae destitute 

 of spurs, either in the middle or at the apex; the antennae are 

 shorter than the wings and stout, with the basal joint slightly robust 

 and a little pilose: — they are of large size, and have the wings 

 obtusely rounded at the apex : they frequent running waters. 



Sp. 1. analis. Plate xkxiv. f. 4. — Nigra, alls fuscis, anticis macula anali 

 alba, nebulisque basalt albidis. (Long. corp. 4^ — 6 lin, ; Exp. Alar. 13 — 15 

 lin.) 



Phr. analis. Fabricius.—Vo. analis. Steph. Catal. 318. No. 3622. 



Black : head densely clothed with a golden pile ; antennae deep brown, with 

 darker clouds ; wings fuscous, with darker nervures, posterior immaculate, 

 anterior more or less clouded with whitish towards the base, and with a 

 somewhat triangular white spot on the anal angle; legs ditty-ochreous, 

 femora dusky. 



Apparently rare : taken in July in the New Forest, near Brock- 

 enhurst, and likewise in Devonshire. 



Sp. 2. assimilis. Nigra, alls fuscis, cupreo tinctis, immaculatis, tibiis tarsisque 

 obscure ochraceis. (Long. corp. 4 — 5 lin.; Exp. Alar. 13 — 14 lin.) 



Po. assimilis. Steph. Catal. 319. No. 3623. 



Black : head with a bright ochreous tuft behind; palpi and antennae dusky; 

 wings fuscous, immaculate, anterior with a coppery tinge, the nervures 

 darker ; legs dusky, with the tibiae and tarsi dirty-ochreous. 



Also found in the New Forest, in July, and in the north of 

 England, and in Devonshire. 



Sp. 3. hyalina. Nigra, antennis gracilibus, brunneis, alis subhyalinis pallide 

 fuscescentibus, immaculatus, palpis tibiis tarsisque ochraceis. (Long. corp. 



44 lin.; Exp. Alar. 14 lin.) 

 Po. hyalina. Steph. Catal. 319. No. 3624. 

 Black: head with a pale tawny patch of hairs behind; palpi ochreous; 



antennae slender, pale brown ; wings somewhat transparent, pale fuscous, 



with darker nervures ; anterior immaculate, posterior rather dusky ; femora 



blackish ; tibiae and tarsi ochreous. 



Inhabits the metropolitan district, in June. 



