FUNGUS GNATS OF NORTH AMERICA. 95 



yellow. Mesonotum yellowish with 3 broad black vittse dilated 

 anteriorly; hairs yellowish, setae black; pleura and metanotum 

 fuscous black; scutellum yellow, lateral angles blackish. Abdo- 

 men fuscous black, moderately shining, the last segment except 

 the base, the posterior margins of the remaining segments, a 

 median stripe on segment 2 and the bases of 3 and 4 yellow ; 

 lamelte of the ovipositor ochraceous. Coxae and legs pale yel- 

 low, tips of posterior femora black, flexor surface of each 

 middle tibia with a single setae ; hind metatarsus shorter than 

 joints 2, 3 and 4 taken together. Central wing spot large* 

 preapical spot fills out the apex of cell Ri from tip of vein Rx 

 and reaches Cui interrupted over cell Mi; a more or less dis- 

 tinct gray cloud behind the cubitus opposite the central spot. 

 "jMaryland ;" Hemlock Falls, N. J. June. 



16. Mycetofhila nodulosa Williston. 



Trans. Ent. Soc. London. 264. 1896. 

 Male. Length 2.5 mm. Antennse brownish-yellow, the bas.il 

 joints yellow; longer than the head and thorax together. Front 

 and face light ochraceous yellow; palpi brown. Mesonotum^ 

 light ochraceous yellow, lightly white pruinose on the sides, 

 and with blackish and yellow hair; pleura brownish-yellow. 

 Abdomen reddish-brown; pubescence chiefly black. Legs yel- 

 low, the coxse and femora light yellow, the broad nind femora 

 at the tip brown. Front tibiae about 1-3 of the length of the 

 tarsi and shorter than the metatarsi ; middle tibiae with spines 

 on the inner sidd ; hind tibiae with 2 rows of spines on the 

 outer side. Wings lightly tinged, the outer part of the first 

 section of the media, the crossvein and the base of the second 

 section of Rs thickened, forming a straight spindle-shaped mass. 

 "St. Vincent Isl." 



17. Mycetophila dolosa Williston. 



Trans. Ent. Soc. London. 264. 1896. 

 Male. Length 2.5-3 "^i"^!- Antennae brown, somewhat com- 

 l^ressed, the basal joints yellowish. Front and face brown, 

 mesonotum dark brown, opaque, with a thin yellowish sheen 

 in some reflections. Abdomen dark brown or black, the venter 

 yellow. Pleura yellowish-brown. Coxae and legs light yellow, 

 the tarsi appearing blackish from the hair; front tibiae less than 



