FAM. ^lYCETOPHILID^ 
n. Cubitus forks opposite the distal end of 
theR-M crossvein {P\. 5,^ 3) . 
nn. Cubitus forks before the proximal end 
of the R-M crossvein, the base of its 
anterior branch detached (PI. 5, 
Fig. 14) 
ii. Cubitus forks distad of the fork of the media. 
j. Fossil form from amber (PI. 5, Fig. 15). 
jj. Recent forms, ocelli in a transverse row on tht 
broad front, the middle one small (PI. 5, 
Fig. 16) 
hh. Scg {subcostal crossvein) absent. 
i. Cubitus forks proximad or under the fork of the 
media. 
j . Petiole of the media, measured from the crossvein, 
at least as long as the R-M crossvein. 
k. Petiole of the media at least as long as the 
anterior branch. 
I. Setae of the posterior tibiae strong; anterior 
branch of the media enters the margin of 
the wing before the apex; lateral ocelli 
coniiguous to the eye margin (PI. 5, 
Fig. 18) 
II. Setae of the posterior tibiae feeble; anterior 
branch of the media enters the margin of 
the wing beyond the apex; three ocelli on 
the front (PI. 5, Fig. 17). . . . 
kk. Petiole of the media, measured from the cross- 
vein, shorter than the anterior branch. 
I. The subcostal vein very long ending beyond 
three- fourths the length of the iving; fossil 
(PI. 5, Fig. 19) 
II. Subcostalvein not over half the wing in length. 
m. The branches of the cubitus apparently 
arising at the base of the wing ; fossil 
(PI. 5, Fig. 20) 
mm. Cubitus luith distinct petiole. 
n. Anal vein produced to the margin ( PI . 5 , 
Fig. 2 1) 
nn. Anal vein not produced to the margin 
(PI. 5, Fig. 22, 23) . . . 
jj. Petiole of the media measured from the crossvein 
shorter than this crossvein; ocelli two (PI. 5, 
Fig. 24) 
ii. Cubitus forks distad of the fork of the media. 
j. The three ocelli arranged in a triangle on the 
28. Genus Dianepsia, Loew. 
29. Genus Acrodicrania, Skuse. 
3o. Genus Pal/eophthinia, Meunier. 
3i. Genus Phthinia, Winnertz. 
32. Genus Anomalomyia, Hutton. 
33. Genus Aneura, Marshall. 
34. Genus Mycetophilites, Forster. 
35. Genus Thimna, Giebel. 
36. Genus Sackenia, Scudder. 
37. Genus Pal.eoanaclinia. Meunier. 
64. Genus Delopsis, Skuse. 
