270 On the Jurassic Dipteron, Platyura fittoni. 
British Museum, I took occasion to examine the type of 
P. fittoni (B.M. reg. no. In. 12753). Moreover, I was fortu- 
nate enough to discover among some undetermined material 
the counterpart of the type, which is in rather better con- 
dition than the type itself. By a study of the two halves of 
the specimen, I was able to make out the wing-venation in 
some detail, as shown in the accompanying figure. Unfor- 
tunately the base and tip, as well as the lower half of one 
wing, are imperfect, and the second wing, which appears to 
be folded on itself, shows little or no structure. The portion 
of the wing preserved, however, shows clearly the tip of the 
long subcosta, the three- pranclied radius, and the two-branched 
media. The 7-m eross-vein appears to be situated slightly 
before the fork of the radial sector, but is not very clearly 
marked, The upper branch of the sector (f,,3) is long and 
ends in the costa a very short distance beyond the tip of 2?,. 
paeitibigcoss a 
Mycetophetus (Platyura) fittoni (Brodie). Wing of type. 
The venation of P. fitton? as now ascertained has no re- 
semblance to that depicted in Férster’s figure (copied by 
Johannsen) of A/ycetophilites. On the other hand, it agrees, 
so far as it is preserved, with that of the American Miocene 
genus Mycetophetus, Scudder (Bull. U.S. Geol. Surv. no. 93, 
p- 19, 1892). This genus was referred by Johannsen to the 
subfamily Bolitophiline, but it does not fit in well with the 
recent members of this subfamily on account of the long 
upper branch of the radial sector, which gives it a rather 
striking resemblance to some of the Anisopodide, such as 
Mycetobia. The position of the 7m cross-vein before the 
fork of Rs would seem to exclude Mycetophetus from 
the Anisopodide, but it may, perhaps, be regarded as 
an archaic form intermediate between this family and the 
Mycetophilide. 
2 hte 
