2<34 Professor Williston on the 



Mycetophila. 

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



Taijle of Species. 



1. Veiu between the outer part of the first basal cell and the 



second basal cell thickened iiodulosa, n. sp. 



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



2. Hind metatarsi distinctly shorter than the remaining 



joints together insipicnH, n. sp. 



Hind metatarsi about as long as the following joints 



together dolu.sa, n. sp. 



1. Mycetojyhila insipiens, n. sp. (PI. VIII., fig. 19, wing.) 



$ . 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 coxa3, light yellow ; front 

 tibiaj 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 tibiaj M'ith 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 tliird veiu. Length 

 '2h mm. 



Six specimen,s. 



2. Mycetophila dolosa, n. sp. 



(^ . AntenniB 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 Pleun^ yellowish-brown. 

 <Jox8e and legs light yellow, the tarsi appearing blackish from 

 the hair ; front tibia3 less than half of the length of the tarsi, and 

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

 spines on the outer side ; middle tibiie 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. 3Iyceto2)hila noduIosa,n. sp. (Pi. VIII., fig. 20, wing.) 



(J. Antennte brownish-yellow, the basal joints yellow ; longer 



than the head and thorax together. Front and face light 



