FUNGUS GNATS OF NORTH AMERICA. 257 



I, Gnoriste niegarrhina Osten Sacken. t^ 

 Bull. U. S. Geol. Survey. Terr. III. 193. 1877. 

 Male and female. Length of body 7 mm. ; of the proboscis 

 5.5 mm. ; face deep velvet black, opaque ; antennae brown, sec- 

 ond joint somewhat reddish ; proboscis brown ; vertex black, 

 with a slight gray pollen ; thorax brownish-yellow, with 3 

 black stripes on the dorsum, the intermediate geminate; in the 

 male the thorax is nearly entirely black ; abdomen dusky, in the 

 female the segments with posterior margins yellowish. Legs 

 yellow ; tarsi infuscated, in the male one claw of each foot 

 modified, in the fore and middle feet this claw is deep spoon- 

 shaped, with fluted sides and serrate margin, in the hind foot 

 it is more slender, ribbed. Wings with slight yellowish tinge, 

 a light gray shadow along the hind margin beginning at the 

 apex. Halteres yellow. (Fig. 169). Hypopygium (Figs. 137, 

 139). "California," Mass. (C.W.J.) and Ithaca, N. Y. May 

 and June. 



2. Gnoriste groenlandica Lundbeck. 

 Dipt, groenl. I, Vidensk. Meddel. nat. Foren. i. Kbhvn. 1898. 

 Male and female. Length 6.5 to 7.5 mm. ; proboscis 4 mm. 

 Coloring similar to G. megarrhina, but more cinereous. Wings 

 hyaline slightly yellowish tinged, venation as in G. opicolis ex- 

 cept that the cubitus forks nearer the base of the wing. Fore 

 metatarsus and its tibia subequal in length. "Greenland." 



3. Gnoriste niacra n. sp. 



Male. Length 6|- mm ; proboscis 2 mm. Black, shining, 

 including front and vertex ; proboscis, palpi and antennse 

 brown ; thorax with yellow hairs ; legs including coxre yellow, 

 tarsi darker; one claw of fore and middle foot modified as in 

 G. megarrhina, the hind foot is broken in the single male speci- 

 men. Wings hyaline with yellow tinge along costal margin 

 (Fig. 170). Halteres yellow. Hypopygium yellowish resem- 

 bling that of megarrhina, differing chiefly in the form of the 

 forceps (Fig. 138). 



Female. In coloring similar to the male but the thorax is 

 yellow to brown with 3 shining black subconfluent dorsal stripes. 

 Tarsal claws not modified. In both sexes the fore metatarsus 

 is about ^ as long as the tibia. White Fish Bay, Wisconsin 

 (W.M.W.) Mav. 



