THE MYCETOPHILID^. 117 



the thorax; the middle one placed before the two lateral ones. 

 Pectus testaceous. There are also ferruginous bands on the abdo- 

 men. The wings are marked with a tawny hue. The veinlets of 

 the prae-brachial areolet forming a right angle, the fore one about 

 half the length of the hind one, and nearly as long as the fourth 

 longitudinal before its fork. The fork of fifth nearer base of wing 

 than fork of the fourth longitudinal vein. Tarsi are brown ; legs 

 tawny ; tibiae covered with long stout spurs ; fore tibiae longer than 

 fore metatarsi. 



AI. stfllida, WW.. 



This species is described* as being blackish-brown. The antennae 

 are tawny at the base and no longer than the thorax. Palpi tawny. 

 Thorax clothed with pale down ; tawny in front, on each side, and 

 beneath. Wings gray ; transverse veinlets of the proe-brachial areolet 

 slightly clouded with brown ; veinlets of the prc'e-brachial areolet 

 forming an obtuse angle, the hind one longer than the fore one and 

 twice the length of the fourth longitudinal vein before its fork ; fork 

 of fifth longitudinal vein further than fork of fourth from the base of 

 wing. Halteres testaceous. Legs tawny, short and stout. Tarsi 

 blackish ; hind femora with black tips j fore tibice longer than fore 

 metatarsi. 



Af. slgnato, Mg. = M. distigma. 



The life-history of this species seems to be roughly known. 

 vStanniusf reared it from Boletus edidis, found especially in pine- 

 woods. The larvae, according to Osten-Sacken, spin their cocoons 

 without leaving the fungi. The cocoon is truncated at one end, 

 and this truncature covered with a delicate web, which the fly 

 breaks through in escaping. The larvre, as in all of this genus, are 

 yellowish-white and stout, the horny head being brown. The imago 

 is yellow to rusty yellow ; the thorax with three distinct and dark- 

 brown longitudinal stripes, the middle one expanded in front ; sides 

 of the thorax sometimes brown. Abdomen variable in colour ; 

 yellow, the anterior segments marked with brown, and divided 

 into two spots by a line down the middle ; the sixth segment and 

 $ organs tawny. Head yellow and brownish in parts \ antennae 

 brown ; yellow at the base. Legs tawny yellow ; hind femora brown ; 

 tarsi brownish. Wings yellowish ; tawny veins ; a brownish spot on 



* " Ins. Brit.," vol. iii., p. 15. 



t Bemerkungen iiber einige Arten Zweiflugl. Gattungen. Macrocera etc. Isis, 

 1830. 



