10 MYCETOPHILID*. 



the elongated coxae and spurred tibiae, and their movements are 

 short, skipping, and abrupt, like those of other genera with simi- 

 larly formed legs, such as Pulex, Orc/iesia, Anaspis, Talitrus, etc. 

 The fore legs have comparatively short tibiae and long tarsi, the 

 hind legs long tibiae and short tarsi. 



The larva of M.fusca is vermiform ; its head is small, with two 

 short antennae ; there are two spiracles on the prothorax, and two 

 on the seven basal joints of the abdomen. The larvae of most 

 species feed on Fungi or Boleti, and spin silken webs, within 

 which they become pupae. The species may be grouped thus : 



a. TibisB thickly beset with long, stout spurs. 



b. Subanal vein or pobrachial vein simple or entire. Species 1-4. 



b b. Subanal vein forked. 



c. Wings with a subapical band. Species 6-11. 

 c c. Wings with no subapical band. 



d. Wings with a discal spot. Species 12-15. 

 d d. Wings unspotted. Species 16-18. 

 a a. Tibia3 thinly beset with short slender spurs. 



b. Fork of the subanal vein very much nearer than the fork of the 

 subapical to the base of the wing. Species 19-21. 



b b. Fork of the subanal vein much nearer than the fork of the sub- 

 apical to the base of the wing. Species 22-24. 



b b b. Fork of the subanal vein a little nearer than the fork of the 

 subapical to the base of the wing. Species 25-27. 



b b b b. Fork of the subanal vein very little nearer than the fork of 

 the subapical to the base of the wing. Species 28, 29. 



b b b b b. Fork of the subanal vein hardly nearer than the fork of the 

 subapical to the base of the wing. Species 30, 31. 



b b b b b b. Fork of the subapical vein as far as the fork of the sub- 

 anal from the base of the wing. Species 32. 



b b b b b b b. Fork of the subapical vein a little nearer than the fork 

 of the subanal to the base of the wing. Species 33. 



bbbbbbbb. Fork of the subapical vein very much nearer than the 

 fork of the subanal to the base of the wing. Species 34-41. 



In the eighteen following species the body is rather stout ; the an- 

 tennae robust and compact, slightly setaceous, a little longer than the 

 thorax ; the legs are thick ; the posterior tibiae have very long spurs ; 

 and the hind tibia? are armed on each side with long stout spines ; the 

 tarsi are comparatively short, and the posterior are thickly setose be- 

 neath. This group comprises nearly all the Mycetophilas with spotted 

 wings. The species from the first to the sixth have a simple subanal 

 or pobrachial vein, and in the rest the subapical vein is very short 

 before its fork, which is opposite, or nearly so, to the fork of the sub- 

 Anal. 



1. nigra, Meig. Zw. i. 270. 23 (1818), vi. 304. 23 (1830) ; Mcq. ; 



