1 2 o AN A ceo UNT OF BRITISH FLIES. 



short ; tarsi brown ; tibiae dark ; very short spurs in hind ones. 

 Length, 2^ to 3 lin. 



(R. maculosa, Zett. 

 R. discoidea, Zett. 

 M. zonata, Steph. 



This is a common species, reddish-yellow in appearance, wiih 

 testaceous ventral surface. The palpi and antennae are testaceous ; 

 the latter dark at the base. The two veinlets, which form the prae- 

 brachial areolet, make a right angle ; the posterior one very much 

 larger than the fore one ; about three times the length of the fourth 

 longitudinal vein before its fork ; the hind branch curved. The anal 

 vein extends far beyond fork of fourth longitudinal vein. The abdo- 

 men is brownish-black, with four testaceous bands on the fore 

 segments ; the extremity of the abdomen is testaceous. The legs 

 are long and slender, dark reddish-brown; tarsi almost black; spurs 

 long ; very small on hind tibiae ; the fore tibiae much shorter than 

 fore metatarsi. Length, i| to 2 lin. 



There are four other British species of this genus ; viz., tnincata, 

 Wtz. ; maculosa, Mg. ; selecta, Wlk. ; and sericea, Mg. 



GY.^\j5.—Dynatosoma, Wtz. = Mycetophila, Mg. 



This genus much resembles Mycetophila. There are two ocelli 

 only. The base of the fourth hind areolet is much more distant from 

 the base of the wing than is the base of the second hifid areolet. 



^ r . • TVT [M. fuscicornis, Mg. 



D. fuscicornis, Mg. = - -^ ' o 



\M. prausta, Staeg. 



This is the only species of this genus found in Britain. It was 

 formerly included in the Mycetophila, and was described as one by 

 Walker ; but it is now raised to a distinct genus by Winnertz. 



The imago is blackish-brown ; thorax tawny in front, with three 

 dark-brown spots ; palpi yellowish. Antennae yellowish at the base ; 

 abdomen with a white tomentum beneath ; legs yellowish ; tarsi 

 brownish ; tips of posterior femora dark-brown ; fore-tibise long. 

 Wings grayish-brown, with two distinct brown spots, one on the tip 

 of the prae-brachial areolet and of the fork of the fourth longitudinal 

 vein, the other near the costa ; fifth longitudinal vein forked ; sixth 

 does not extend to the fork of the fifth. Length \\ to 2 lin. 

 Found in the autumn and winter. 



Genus. — Exechia = Mycetophila, Mg. 

 The ocelli two, small. Sides of the thorax with bristles. Abdomen 



