270 On the Jtirassic Dipteron, Platyur.i fittoni. 



British ]\Iiiseuni, 1 took occasion to cxaniiiie the typo of 

 P. fittoni (B.M. rog. no. In. 12753). Moreover, I was tortu- 

 iiate enough to discover among some undetermined material 

 the counterpart of the type, whicli is in rather better con- 

 dition than the type itself. By a study of the two iialves of 

 the specimen, I was able to make out the wing- venation in 

 some iletail, as shown in the accompanying figure. Unfor- 

 tunately the base and tip, as well as the lower half of one 

 wing, are im))erfcct, and the second wing, which appears to 

 be folded on itself, shows little or no structure. The portion 

 of the wing preserved, liowever, shows clearly tlie tip of the 

 long subcosta, the three-branched radius, and the two-branched 

 media. The r-m cross-vein appears to be situated slightly 

 before the fork of the ratlial sector, but is not very clearly 

 marked. The upper branch of tho sector (i?2+a) is long aiid 

 ends in the costa a very short distance beyond the tip of i^^. 



MycetophcBtm {Platyura) fittoni (Brodie). Wing of type. 



The venation of P. ^/tont as now ascertained has no re- 

 semblance to that depicted in Forster's figure (copied by 

 Johannsen) of Mycetojjhilites. On the other hand, it agrees, 

 so far as it is preserved, with that of the American Miocene 

 genus Mi/cetoph(etus, Scudder (Bull. U.S. Geol. Surv. no. 93, 

 p. 19, 1892). This genus was referred by Johannsen to the 

 subfamily Bolitophilina?, but it does not tit 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 resemldance to some of the Anisopodidfe, such as 

 Mijcetohia. The position of the r-vi cross-vein before the 

 fork of Rs would seem to exclude Mycetophcetus from 

 the Anisopodidre, but it may, perhaps, be regarded as 

 an archaic form intermediate between this family and the 

 Mycetophilidag. 



