THE MYCETOPHILIDM. 



S. Riificauda, Mg. 



This is slightly smaller than Thomcc, and can easily be distinguished 

 from it by its red abdomen. Dale has taken it from rotting hay and 

 straw in the autumn. 



There are a large number of this genus found in England. Win- 

 nertz, in his "Monograph of the Sciarinae," describes 175 species, 

 and those who wish for detailed descriptions, and who intend work- 

 ing at this group, should consult it. As it seems a somewhat rare 

 work in England I append his method of classifying this genus of 

 the Mycetids : 



I. The second long, vein (unterrandader) joins the costa at or beyond the fork 



of the fourth long. vein. (Fig. 19, A, B.) 



A. Wings black or brown. 



I. Antennoe black or brown. 



A. Transverse veinlet situated before the middle of the second long. vein. 



a. The apex of the cubitus (second long, vein) lies nearer to the 

 apex of the wing, than does the apex of the lower prong of 

 the fork. 

 /?. The apex of the cubitus (second long, vein) and that of the lower 



prong are equidistant from the apex of the wing. 

 -/. The apex of the lower prong of fork is nearer the apex of wing 

 than the apex of the cubitus, 

 u. The transverse veinlet is situated in the middle of the second long. vein. 



«. /3. and 7. as above, 

 c The transverse veinlet is situated beyond the middle of the second long, 

 vein. 



a. Only. 



B. Wings yellow. 



1. Antennae black or brown. 



A. Transverse veinlet situated before the middle of the second long. vein. 



a. and /3. 



B. Transverse veinlet situated /// the middle of the second long. vein. 



a. Only. 



2. Antenn* yellow. 



A. Transverse veinlet situated before the middle of the second lon^^. vein. 

 /3. Only. 



II. The second long, vein joins the costa before the fork of the fourth long, vein 



(Fig. 19, c.) 



A. Wings black or brown. 



1. Antenn.^ black or brown. 



A. a, /3, y, as above. 



B. «, /i, as above. 



c. o, /S, y, as above. 



2. Antennae yellow. 



A. y, as above. 



B. n, /3, y, as above. 



B. Wings yellow. 



1. Antennre black or brown. 



A. « as above. 



B. a as above. 



C. a, fi, as above. 



2. Antennae yellow. 



A. a as above. 



B. a, i3, y, as above, 

 c. a, [i, y, as above. 



