222 Mr. A. H. Haliday on the generic distribution 



Subg. 1 . NoTiniiLA. 



Ncrvus costalis in ala? apice evanesccns. Tibiae mediae cxtrorsum 

 spinosae. Facics perpendicularis lateribus ciliata. Palpi dilatati. 

 Abdomen depressum inerme. 



Sp. 1 . cincrea, N : thorace ferruginoso, abdomine cinereo ni- 



gro-maculato, facie fulvescente, palpis tibiis tarsisque ferrugi- 



neis. 



Fallen Act. Holm. 1813. p. 250.— Hydrom. 8. Meig. Dipt. Eur. 



vi. 65. Macq. S. a B. ii. 521. pi. xxi. fig. 9. — Keralocera palustris, 



Desv. Myod. 88. — K. trapce 8$ fulvicornis, Ibid. 78. 9. 



Everywhere abundant in marshes. Desvoidy has observed 

 that it deposits its eggs in the flowers of Potamogeton. 



Sp. 2. riparia, N : thorace ferruginoso, abdomine cinereo nigro- 

 maculato, facie cinerea, palpis tibiis tarsisque ferrugineis, tibiis 

 annulo nigro. 



Meig. Dipt. Eur. vi. 65. Macq. S. aB. ii. 522. 



Found on the borders of the lake at Blarney Castle, county Cork. 



Sp. 3. uliginosa (Curtis App.), N : thorace ferruginoso, abdomine 

 cinereo nigro-maculato, facie fulvescente, palpis pedibus nigris, 

 tarsis ferrugineis ; m.f. 2 lin. 



In a marsh between GlengarifF and Adrighoule ; banks of the 

 Shannon at Tarbert ; shores of Belfast Lough, much less common 

 than the first species. 



Antennas and palpi black. Face tawny yellow. Frontals 

 dull black. Vertex, orbits, and thorax rusty brown. Abdo- 

 men cinereous, with a blackish spot at the sides of each seg- 

 ment. Legs black, the tarsi (at least the two hinder pair) 

 ferruginous. Halteres yellowish. Wings obscurely hyaline. 



Subg. 2. Dich;Eta, Meig. 



Abdomen maris convexum, apice bispinosum segmento penultimo 

 margine pectinato. Characteres reliqui fere quales Notiphilce. 



Sp. 4. caudata, N : D : nigra obscura, facie fulvescente, tarsis fer- 

 rugineis. 



Fallen Act. Holm. 1813. p. 249. Hydrom. 8. — Diclaetaid. Meig. 

 Dipt. Eur. vi. 62. tab. 58. fig. 1 — 6. Macq. S. aB. ii. 521. pi. xxi. 

 fig. 8. 



Found in England. Communicated by F. Walker, Esq. 



Subg. 3. Discomyza, Meig. 

 Alee abdomen non superantes, postice decurvae. Tibia: mediae 



