222 Maine: agricultural expe;rimlnt :tation. 1909. 



described above. In habitus 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 MycetophcEtiis Scudder. 

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

 This fossil genus ap|)ears 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. intermedius Scudder, from Florissant, 

 Colorado. 



2. Subfamily myce;tobiin^. 

 MycetobiincB 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. Mycetohia. 



bb. Ri-fs and R^-fs separate distad of the crossvein. 

 (Fig. 78). 2. Palceoplatyura. 



aa. Subcostal vein (Sci) vestigial. 



. b. The media forks distad of the base of R2+3. (Fig. 80). 



3. Ditomyia. 



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



(Fig. 81). 4. Syryimerus. 



