222 M^MNE AGRICULTURAL, EXPERIMENT :TATI0N. I909. 



described above. In babitus it reminds one far more of the 

 Bibionid genus Plecia than it does Bolitophila, from which it 

 differs mainly in having 12 antennal joints and but 4 palpal 

 joints. I believe it should be placed with the Bibionidse. 



3. Genus Mycetophcutus Scudder. 

 Mycetophcrtiis Scudder. Bui. U. S. Geol. Survey 93. 19. 1892. 

 This fossil genus appears to be closely akin to Hesperinus, 

 differing mainly in having a much longer R2+3. Venation as 

 figured (fig. 79). Legs long and slender, the fore femora con- 

 siderably longer than the thorax, the tibia longer than the 

 femora, both abundantly spinose. Abdomen 8 segmented. 

 The only species is M. intermedins Scudder, from Florissant, 

 Colorado. 



2. Subfamily MYCETOBiiNyE. fc 

 Mycetobiince Winnertz. Verb, zool.-bot. Ges. Wien. XIII. 



666. 1863. 

 A group possessing in common the following characters; 16 

 or 17 jointed antennse ; 3 ocelli on the vertex; wings rather 

 broad, both the R-M and the M-Cu crossvein present and nearly 

 equidistant from the base of the wing; radius 3 branched; legs 

 long and slender and the tibial spurs rather short. 



Table of genera. 

 a. Subcostal vein (Sci) long, reaching at least 1-4 the length 

 of the wing and usually ending in the costa. 

 b. R2+3 and R^+b both arise at the R-M crossvein. 

 (Fig. yy). - . I. Mycetobia. 



bb. R2+3 and R4-f-B separate distad of the crossvein. '-^ 

 (Fig. 78). 2. Palccoplatyura. 



aa. Subcostal vein (Sci) vestigial. 



b. The media forks distad of the base of R=+3. (Fig. 80). _ 



3. Ditoniyia.^' 

 bb. The media forks proximad of the base of R2+3. 

 ( Fig. 8 1 ) . 4. V Symmerus. 



