1913] North American Dipterous Genus Neurigona 41 



humeri, pleura, scutellum, and the flattened space before paler; scu- 

 tellum with a blackish spot at base; pleuree with a black line in front of 

 the halters, this line sometimes broken into two spots; metanotum 

 black. Abdomen yellow with narrow black bands near the base of 

 segments two, three, and four, the first sometimes infuscated at base; 

 hairs of the abdomen mostly pale; hypopygium nearly as long as seg- 

 ments four and five, but not very thick, first half yellow, last half black 

 or testaceous. Legs pale yellow; front coxae with a few yellow bristles 

 near the tip; middle cox^e with black hairs and bristles; front metatarsi 

 hardly as long as their tibiae, second joint shorter than fourth, and with 

 the apex widened and extended in the form of a short spur on top, 

 somewhat infuscated at tip; third joint a little longer than fourth, and 

 both with a row of short bristles below, these bristles hardly as long as 

 the diameter of the joint ; middle metatarsi about four-fifths as Jong as 

 their tibiae, fourth joint slightly flattened, fourth and fifth joints fus- 

 cous; apical half of middle tibis brown; hind tarsi with the first joint a 

 little shorter than the second, and becoming fuscous from the tip of the 

 first joint. Wings grayish hyaline; fourth vein bent forward from the 

 center of the last section, the tip quite close to the tip of the third vein, 

 and some distance in front of the apex of the wing. 



Female: Differs from the male in having the face quite wide; the 

 abdomen with the hind margins of segments two and three, and some- 

 times the bases of all the segments infuscated; the hairs and bristles of 

 the front coxse black; all the tarsi normal and scarcely infuscated; 

 metanotum yellow. 



Described from two males and five females, taken by Prof. 

 J. M. Aldrich, at Lawrence, Kansas, on June 8th. 



13 Neurigona transversa n. sp. 



Figure 13. 



Thorax reddish yellow, with three pollenose vitt£e; abdomen yellow, 

 with the hind margins of the segments pale; a narrow black line above 

 the pronotum. Length 5-5 3^ mm. 



Female: Face wide, with the sides parallel; face and palpi whitish; 

 antennas deep yellow, first joint paler; palpi with yellow bristles at tip; 

 front and occiput black, thickly whitish pollenose; frontal bristles 

 brownish yellow, orbital cilia rather long and whitish. Dorsum of the 

 thorax reddish yellow, with three vitts formed with yellowish pollen, 

 the narrow central one between the acrostichal bristles has the pollen 

 more dense, the lateral vitts not so sharply defined. There is a bare 

 spot above the root of the wing in each of these vittas; metanotum, 

 scutellum, and the flattened space in front thickly covered with yellow- 

 ish pollen, which is thinner at the base of the scutsllum, the pollen on the 

 lower part of the pleurae more whitish; the usual black line in front of 

 the halters; a yellow bristle above the front coxae; front of the meso- 

 notum with a black transverse line which is almost interrupted in the 

 middle. Abdomen reddish yellow, slightly infuscated, and with dis- 

 tinct yellowish white bands on the hind margins of the segments, that 



