78 DTTEHAM DIPTERA. 



XII. 120. 



24 (23). X.5. at the middle of O. X-veins clouded. 



(760. subtineta, Ztt.) 



25 (20). X.5. before the middle of O. Antennae bearing 



bristly hairs about twice as long as each joint. 



26 (27). Pleura? grey. 



761. Limnophila lucorum, Mg. 

 Bedburn, 2 $, 2 ?, 7-7-02. 



27 (26). Pleurae yellowish. (762. septum, Verr.) 



28 (19). Fork of V.4.a. only from a half to one-tenth of the 



length of the handle (IV. 21), and sometimes 

 absent. 



29 (30). Light grey medium-sized species, usually with stripes 



on the thorax. 



763. Limnophila nemoralis, Mg. 

 Bishop Auckland, 1 $, 1 1-7-00; Shull, 1 $, 7-7-02; 

 Hesleden, 2 $, 12-8-02, in a wood. 



30 (29). Dark small species, thorax unstriped. 



31 (32). Blackish ; wings narrow, almost bare. 



(764. filata, Wlk.) 



32 (31). Brown; wings broad and hairy even on the disc near 



the tip. 



121. Adelphomyia, Bergr. (765. senilis, Hal.) 



122. Trichocera, Mg. 



Larvae in fungi and decaying vegetable matter. 



Note. — The species of " Winter Gnats " require more minute 

 study before any decided opinions can be given as to the dis- 

 tinctness of the species. — Verrall. 



1 (2). Brownish-yellow species, abdomen with brown and 



yellow rings. 



766. Trichocera anm/lata, Mg. 

 Bishop Auckland, 1 $, 2 ?, i-ii-oi. 



2 (1). Brown-grey species, abdomen unicolorous. 



