of the British Hydromyzidse. 223 



nisi apice nudae. Corpus depressum. Facies latissima rugosa. Ab- 

 domen 4-annulatum, orbiculatum, planum, subdeflexum. 



Sp. 5. incurva, N: Discom: nigra tarsis posterioribus antennisque 

 luteis. 



Psilopa id. Fallen, Hydrom. 6. — Discomyza id, Meig. Dipt. Eur. 

 vi. 76. tab. 58. fig. 14—17. Macq. S. aB. ii. 529. pl.xxi. fig. 13. 



Found on the wooded cliflfs about Isle-oronsay in Skye ; Septem- 

 ber. Runs swiftly, but scarcely flies. 



Subg. 4. Trimerina, Macq, 

 Tibiae mediae nisi apice inermes. Alae planae abdomen non supe- 

 rantes. Abdomen marginatum quasi 3-annulatum, i.^e. segmentis 

 1° et 5° minimis, tribus intermediis magnis. Facies perpendicularis. 

 Antennae articulo 3° oblongo. 



Sp. 6. Madizans, N : Tr : nigricans submetallica, antennis femo- 

 ribus anticis pedibusque posterioribus rufis. 



Fallen, Act. Holm. 1813. p. 252. Meig. Dipt. Eur. vi. 74. Ent. 

 Mag. i. 178. — Psilopa id. Fallen, Hydrom. 7, — Trimerina id, Macq. 

 S. aB. ii.529. 



Not uncommon on grassy banks, running actively and flying little. 



Subg. 5. Hygrella. 



Tibiae mediae nisi apice nudae. Abdomen immarginatum segmentis 

 5 subaequalibus. Alae abdomen superantes. Facies perpendicularis, 

 lateribus ciliata. Antennae articulo 3° oblongo deflexo. 



Sp. 7. nitidula, N : H : obscure aenea, antennis tibiis tarsisque po- 

 sterioribus ferrugineis, alis hyalinis. 



Fallen, Act. Holm. 1813. p. 252. Meig. Dipt. Eur. vi. 75,— Psi- 

 lopa id. Fallen, Hydrom. 7. — Notiphila comta. Meig. Dipt. Eur. 

 vi. 68. — Hydrellia id, Macq. S.aB. ii. 524. — Keratocera viride- 

 scens. Desv. Myod. 790 ? 



England ; communicated by F. Walker. 



Sp. 8. leucostoma, N : H ; obscure aenea, antennis pedibusque fer- 

 rugineis, alis hyalinis nervo transverso fusco-cincto. 



Meig. Dipt. Eur. vi. 68. tab. oS, fig. 12. — Hydrellia id. Macq. 

 S.aB. ii.524. 



Common among aquatic plants. 



Subg. 6. DiscocERiNA, Macq, 

 Tibiae mediae nisi apice nudae. Alae planae. Facies medio con- 

 vexa lateribus ciliata. Antennae articulo 3^^ suborbiculato. Probos- 

 cis basi tantum geniculata. 



