1913] North American Dipterous Genus Neurigona 57 



infuscated from the middle of the tibiae, the tarsi becoming black; first 

 and second joints of hind tarsi equal, black from the tip of the first 

 joint. Halters, tegulae and their cilia pale yellow. Wings brownish 

 hyaline, much darker in front of the third vein; veins dark brown; 

 third vein bent backwards at tip, fourth vein bent forwards from 

 beyond the middle of the last section, the tips of third and fourth quite 

 near together. 



Described from one male taken at Doe Bay, Wash., July 16, 

 1909, in the collection of Prof. J. M. Aldrich. 



29 Neurigona perbrevis n. sp. 



Figure 30. 



Dorsum of the thorax grayish green, with three brownish vittss; 

 abdomen black; hypopygium black, polished, and rather large; front 

 tarsi A\dth the last two joints flattened and fringed, fonning an oval tip ; 

 front tibi^ longer than their tarsi. Length 3^4 mm. 



Male : Face rather narrow ; face and palpi white ; front and occiput 

 seem to be black, but the ground color concealed by whitish pollen; 

 orbital cilia white; antennae yellow, the small third joint and the arista 

 brownish. Dorsum of the thorax grayish green, thickly covered with 

 pollen, (this pollen and that of the head and scutellum has a greenish 

 tint). Dorsum with four brown vittae, the lateral ones abbreviated in 

 front; scutellum the same color as the dorsum, but the edges a little 

 yellowish; pleurae black with white pollen. Abdomen black, covered 

 with white pollen which is thickest on the posterior margins of the seg- 

 ments; fifth segment with a yellow hind margin; venter yellow; hairs 

 on the tergum black, those on the sides of the last three segments 

 white; hypopygium shining black, polished, and rather large; append- 

 ages shining black. Legs yellow; front and middle coxae with yellowish 

 hairs and bristles; middle and hind coxae darkened on the outside; front 

 tibiae longer than their tarsi or femora, which are of equal length; meta- 

 tarsi longer than the remaining four joints together; fourth and fifth 

 joints black, flattened, and fringed on each side, forming an oval tip, 

 which is nearly twice as long as wide; middle metatarsi nearly three- 

 fourths as long as their tibiae; hind tarsi nearly as long as their tibiae, 

 the second joint a little longer than the first; hind femora with a few 

 yellow bristles below near the base. Halters yellow ; tegulae and their 

 long cilia whitish. Wings hyaline; fourth vein rather sharply bent 

 towards the third, ending in the apex of the wing, not very close to 

 the tip of the third vein; veins brown. 



Described from two males in the collection of the American 

 Entomological Society, which were taken at Alamogordo, N. M., 

 on April 20 and May 12, 1902. Type No. 5257. 



