FUNGUS GNATS OF NORTH AMERICA. 267 



Venation as figured (Fig. 178). Halteres yellow. Wisconsin. 

 "N. J." I have examined the type hence the synonymy. 



\/ r 



10. Genus Boletina Staeger. /: 



Kroger: Naturhist. Tidsskr. III. 22,2^. 1840. 

 ^ ,^-. PalcroanacUiiia Meunier, Alonogr. Mycetophilidse, etc. 143. 



1904. 

 Ocelli 3, placed in a flattened triangle upon the broad front, 

 the middle one small, laterals remote from the eye margin. 

 Legs slender, fore metatarsus shorter than its tibia, one claw of 

 each foot in the male frequently modified, scoop-like, and 

 fluted. A\^ings elongate, costa somewhat produced beyond the 

 tip of the radial sector; subcosta ends before the middle of the 

 wing in the costa, subcostal crossvein (ScO present or absent; 

 media forks under or somewhat distad of the radial sector; 

 cubitus forks under or proximad of the fork of the media; 

 anal vein incomplete (Figs. 179-192). 



The genus Palceanacliuia cannot be considered distinct, for, 

 with the exception of the absence of the subcostal crossvein,' 

 there are no structural dififerences. In one species (B. obscura) 

 this vein may be either present or absent ; in some others it is 

 quite faint and inconspicuous. 



Table of species. 

 a. Subcostal crossvein (Sco) present. 



b. Halteres black; Sc ends in C opposite base of Rs; Sc^ slightly 

 proximad of proximal end of crossvein. i. abdominalis. 



bb. Halteres mainly yellowish. 



c. Yellow species; hind margins of abdominal segments 2 to 5 



and the whole of 6 and 7 black; wings hyaline, broad apices 



gray; media with long petiole. 2. AUocotoccra parvula. 



cc. Thorax usually dark, or with dark vittse; if not then petiole of 



media but little longer than the crossvein. 



d. The fork of the cubitus proximad of the proximal end of 



the R-M crossvein (Figs. 179-181). 



e. Subcostal vein ends in the costa distad of the base of Rs ; 



coxas black. 3. obscura n. sp! 



ee. Subcostal vein ends in the costa opposite or proximad of 



the base of Rs ; coxae yellow. 



f. Fore metatarsus less than 2-t, as long as tibia; pleura 



y^"o^^'- 4. cincta n. sp. 



ff. Fore metatarsus at least 2-7, as long as tibia; pleura 



"'^^'^- 5- melancholica n. sp. 



