180 



NOri:S ON DIPTERA. 



B.fiisca, Meigen. Found in hedges, woods, &c. during i 

 the spring, autumn, and winter, in various parts of England. 



Orphnephila clevia, Haliday. September, North Wales; 

 frequents moist shady spots. 



Lestremia, Macquart. This genus has more affinity to \ 

 Molobrus than to Cecidomijia. The antennae resemble those : 

 of Zygoneuva, which is still nearer allied to Molobrus. 



Chrysomyia, Macquart. Answering to Meigen's second i 

 division of Sargus, and comprising S.formosus, S. politus, &c. i 



Atherix melcena, Hoifmansegg. May, in woods near ij 

 London. The male probably belongs to the genus Spaniaf J 

 Meigen. The disposition of the nervures of the wings varies i 

 very much. 



Atherix immaculata, Fabricius. Found near London in i 

 June. 



Tachypezu arenaria, Haliday. Inhabits sea- weed and rocks i 

 on the coasts of South Devonshire, Cornwall, and the Isle of 

 Wight, during the summer and autumn. Var. ? /i. alata. 

 Ala; amplce, subfuscce ad costam obscuriores. September, 

 South Devonshire and Cornwall. 



T. graminum, Fallen. September, in the Isle of Wight, 

 near Alum-bay. 



T. praelusio. Griseo-fusca, oculi obscuriores, pedes palli- 

 diores, alee angusta brevissimce siiblimpidce. (Long, lin. h.) 

 Dull, pale, half the size of T. graminum ; body longer and 

 more slender, antennae very short, abdomen thrice the length 

 of the thorax, looks like a little Molobrus, runs fast, but has 

 not the activity of the preceding species. September, on plants 

 in a thick wood, near the Devil's-bridge, North Wales. 



T. ? hirta. Nigra, obscura, parce hirta, T. arenaria triple 

 major, oculi et halteres obscure rufi, pulvilli flavi ; alee 

 subfuscoe amplce, nervi nigri. (Corp. long. lin. 1 \ ; alar. lin. 

 22.) June, on sea-weed in the Isle of Wight. 



Drapetis, Megerle ; 1 aterrima, Haliday ; 'ilfuscipes, Mac- 

 quart ; 3 nigra, Meigen ; 4 eccilis, Megerle ; 5 flavipes^ 

 Macquart. All these inhabit Britain, but probably are not 

 all distinct species, for their size and the colour of their legs \ 

 and wings vary very much ; they run with extraordinary swift- 

 ness. D. nigra and Z). exilis may be found near London 

 from May to October, among grass, and beneath planks placed 

 on decayed vegetable matter, &c. When in these situations 



