2l8 MAINE AGRICULTURAL, EXPERIMENT STATION. I909. 



basal cells R and M distinct and closed at the distal end by the 

 crossveins or by the coalescence of the basal section of the 

 media and cubitus ; the cell M much shorter than the cell R. 



Table of genera. 

 a. R=-|-3 shorter than the distance of its base from the cross- 

 vein and shorter than R4+5. 

 b. Antennae 17 jointed, slender (figs. 75, 76). c^ V'' 



I. Bolitophila. ^ 

 bb. Antennae 12 jointed (fig. 74). 2. Hesperinns. 



aa. Ra-fs much longer than the distance of its base from the 

 R-M crossvein (fig. 79). Fossil genus. 



3. Mycetophcctus. '' 



I. Genus Bolitophila Meigen. . \ 

 Bolitophila Meigen, Syst. Beschr. Zweifl. I. 220. 1818. 

 Messala Curtis, Brit. Ent. 581. 1836. 



Head hemispherical ; 3 ocelli arranged in a curved line on 

 the broad front; palpi 4 jointed; antennae filiform, in the male 

 nearly as long as the body, of the female shorter, 2-}- 15 jointed. 

 Thorax small, highly arched. Abdomen slender, of the male 

 with 8, of the female with 9 visible segments. Legs slender, 

 tibial spurs short and weak. Venation as figured (figs. 75, 76). 



Table of species. 

 a. Anterior branch of the cubitus disconnected at the base 

 (fig. y6). I. disjuncta 



aa. Anterior branch of cubitus connected at the base. 



b. R=+3 ends in Ri (fig. 75). 2. cinerea. 



bb. R=-f 3 ends in the costa. 



c. The subccsta ends at or distad of the base of the 



radial sector in the male. 3. hybrida. 



cc. The subcosta ends noticeably proximad of the 



base of the radial sector. 4. montana. 



I. Bolitophila disjuncta Loew. 

 1869. disjuncta Loew. Beschr. europ. Dipt. L 19. 17. 

 Male. Length 6 mm. Head cinereous, proboscis brownish, 

 palpi yellowish ; antennae about as long as the insect, fuscous, 



