264 Professor Williston on the 



Mycetophila. 

 Meigen, Illiger's Mag., ii., 263, 1803. 



Table of Species. 



1, Vein between the outer part of the first basal cell and the 



second basal cell thickened nodulosa, n. sp. 



Yein at outer part of first basal cell not thickened. ... 2 



2. Hind metatarsi distinctly shorter than the remaining 



joints together insipiens, n. sp. 



Hind metatarsi about as long as the following joints 



together dolosa^ n. sp. 



1. Mycetophila insipiens, n. sp. (PI. YIIL, fig. 19, wiug.) 



$ . Antennae about as long as the thorax, yellow ; brownish 

 toward the end. Front and face yellow. Mesonotum yellowish- 

 red. Abdomen reddish-yellow ; each segment broadly brown on 

 its posterior part. Legs, including the coxse, light yellow ; front 

 tibiae about one-third of the length of the tarsi, and shorter than 

 the metatarsi ; middle tibiae with two large and one small bristles 

 on the inner side ; middle and hind tibiae with spines on the outer 

 side ; hind metatarsi distinctly shorter than the remaining joints 

 of the tarsi together. Wings tinged with yellowish ; a small 

 brownish cloud on the basal section of the third vein. Length 

 2^ mm. 



Six specimens. 



2. Mycetophila dolosa, n. sp. 



(^ . Antennae brown, somewhat compressed, 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 Pleurae yellowish-brown. 

 Coxae and legs light yellow, the tarsi appearing blackish from 

 the hair ; front tibiae less than half of the length of the tarsi, and 

 a little longer than the metatarsi ; hind tibiae with two rows of 

 spines on the outer side ; middle tibiae with spines on the inner 

 side ; hind metatarsi nearly as long as the following joints together. 

 Wings tinged with brownish. Length 2|-3 mm. 



3. Mycetophila nodulosa, n. sp. (PI. YIII., fig. 20, wing.) 



cJ. Antennae brownish-yellow, the basal joints yellow^ ; longer 

 than the head and thorax together. Front and face light 



