NOTES ON DIPTERA. 179 



12"^ conicus, acuminatus : thorax trans caput longe produc- 

 tus : pedes crassi ; tarsi incurvi, articulo basalt brevissimo. 

 P. extremus. Fem. Obscure ferrugineus, parce Jiirtus : 

 thoracis et abdominis latera pallida : antennce fusccB : pedes 

 nigro-fusci : alee fiisccB, breves, pubescentes. (Corp. long. 

 lin. 1|; alar. lin. 2^.) Found near London. 



Cecidomyia producta, Meigen. Found near London. 



Erioptera pygmaa, Macquart. Inhabits woods near Lon- 

 don in May. 



Limnophila, Macquart. Separated from Limnobia, Meigen, 

 and comprising L. punctata, Meigen, and other species, that 

 have five posterior cells to each wing. 



Limnobia occulta, Meigen. Frequents the verdant banks 

 of mountain rivulets in North Wales, and the vicinity of the 

 lakes of Westmoreland and Cumberland during the autumn. 

 The species of insects, as well as the soil and climate of the 

 above-mentioned countries, are nearly alike. 



Cylindrotoma, Macquart. Founded upon Limnobia dis- 

 tinctissinia, Meigen. Taken at New Lanark, Scotland. 



Tipula dispar, Haliday. Rare near London, but very 

 common in North Wales from September to November. The 

 short wings of the female, like those of many winter moths, 

 are useless for flight, and it crawls over heath and furze 

 bushes. 



Pachyrhina, Macquart. A genus answering to Meigen's 

 second division of Tipula, and comprising T. crocata, pra- 

 tensis, imperialis, &c. 



Ptychoptera lacustris, Meigen. Found at New Lanark. 

 It has darker and more slender legs than P. contaminata. 



Dictenidia and Xiphiira, Brulle. These two genera were 

 separated from Ctenophora, by Brulle. The type of the 

 former is C. bimaculata ; of the latter, C. atrata ; while 

 C. pectinicornis is left with that genus. Ptychoptera is allied 

 to Dictenidia and Ptych. pectinata, Macquart connects them. 



Hexatoma nigra, Latreille. Found at New Lanark, 

 Scotland. 



Bolitophila maculipennis. B. fusca major ; alee maculis dua- 

 bus fascis, una disco, altera ad nervi suhcostalis apicem. 

 (Corp. long, lin 3^ ; alar. lin. 6.) Found but very rarely 

 near London in the spring; and in the autumn, near Amble- 

 side, in Westmoreland. 



