220 SUPPLEMENT. 



the tibiffi hardly longer than the metatarsi. Wings lightly tinged with brownish ; anterior branch 

 of the posterior furcation separated at its origin from the vein. Length 4 millim. 

 $ . Head above black. The yellow of the mesonotum has an elongated black spot or stripe in the middle, 

 narrowed to a point, and separated from the same colour of the sides by a slender, curved, yellow stripe ; 

 posterior half of the pleura black. Wings with a brownish cross-band distally. Abdomen almost 

 wholly black. 



Hab. Mexico, Cuernavaca in Morelos, Medellin, near Vera Cruz (II. H. Smith), 

 Orizaba (H. H. Smith & F. D. Godman). 



Two males and two females, no two of which agree in all respects, and possibly not 

 belonging to the same species. The second male (from Medellin) differs in having the 

 abdomen yellow, with a large black spot on each side of the segments, except the sixth ; 

 the hypopygium is also black. Both of the females are from Orizaba : in one, which 

 is probably conspecific with the Cuernavaca male, the median triangular spot of the 

 mesonotum is absent, the mesonotum being marked as in the male, and the fascia of 

 the wings is obsolete. N. opima, Loew, from Connecticut, is certainly closely allied 

 to the typical males described, but it has the wings nearly as in the females. 



MYCETOPHILA. 



Mycetophila, Meigen, in Illiger's Magazin f. Ins. ii. p. 263 (1803). 



The species of this genus in the collection before me are each represented by 

 a single example which I am unable to identify. As the identification of Mycetophiloe 

 is often difficult, I do not think it advisable to name them till more material is 

 obtained. 



1. Mycetophila ? 



2 ■ Head yellowish-brown. Antennae brown, the basal joints yellowish. Mesonotum yellowish-red, 

 unicolorous, opaque ; pleurae in part more brownish. Abdomen brownish-black. Legs light yellow ; 

 tip of hind femora narrowly blackish ; all the tarsi brownish. Wings yellowish ; a small brown spot on 

 the first section of the third vein and the prefurca of the fourth ; neuration nearly as in the following, 

 the furcation of the fourth vein a little more distal. Length 3| millim. 



Hab. Mexico, Omilteme in Guerrero 8000 feet (H. H. Smith). 



2. Mycetophila ? 



$ . Front reddish-yellow, not shining ; face and mouth-parts lighter yellow. Antennas yellow, brownish 

 distally ; about as long as the mesonotum. Mesonotum uniform reddish-yellow, opaque ; pleurae lighter 

 yellow. Abdomen reddish-brown. Legs light yellow, the tarsi brownish. Wings uniformly yellowish, 

 the third vein terminating nearly midway between the tip of the first and that of the anterior branch of 

 the third ; prefurca of the fourth vein short, not longer than the first section of the third ; the posterior 

 furcation occurring a little before the proximal end of the anterior cross-vein. Length 4i millim. 



Hab. Mexico, Omilteme in Guerrero 8000 feet (H. H. Smith). 

 This species is related to M. dolosa, Willist. 



