46 Annals Entomological Society of America [Vol. VI, 



18 Neurigona deformis n. sp. 



Figure 18. 



Thorax black; abdomen yellow with black bands; h^^popygium 

 black, small; three joints of the front tarsi flattened; wings with the 

 costa and third vein much arcuated, and with a brown cloud along the 

 front towards the tip. Length of male 6-6>^ mm., of female 0)4 mm. 



Male : Face not very narrow for a male, but narrowest in the center, 

 and silvery white; front and occiput black, covered with white pollen, 

 which is thickest on the front and upper part of the occiput; antennae 

 yellow, the rather long arista brownish; frontal bristles black; orbital 

 cilia and post-vertical bristles yellowish. Thorax black, rather shining on 

 the dorsum, thinly dusted with white pollen, this pollen much thicker 

 along the front, on the sides, and between the acrostichal bristles; the 

 pollen on the flattened space before the scutellum thick and somewhat 

 greenish; pleurae covered with white pollen, which almost conceals the 

 ground color; humeri, posterior angles of the dorsum, space between 

 the front coxae, and metathoracic epimera yellow; scutellum black on 

 the disk, yellow beneath, which color extends somewhat onto the edge 

 of the disk; metanotum black with white pollen. Abdomen yellow; 

 second to fifth segments with black bands at base, those on the second 

 and third segments widest on the center of the tergum, narrowing to a 

 point on the lateral sides; hairs on the dorsum of the second and third 

 segments mostly black, those on the rest of the abdomen and the long 

 bristles on the margin of the first segment yellow; hypopygium black, 

 polished, and with its appendages more or less testaceous; sheath on 

 the venter of the fifth segment corrugated, and opaque black. Legs 

 long and slender, pale yellow; front coxcE with minute yellow hairs on 

 the front, and several yellow and one or two black bristles near the tip; 

 middle coxas with a few black hairs and bristles near the tip; front 

 femora with about ten long yellow hairs on the outside near the tip; 

 middle femora nearly bare except near the tip; front metatarsi about 

 the length of their tibiae; second, third, and fourth joints of front tarsi 

 flattened, bare on the sides, ciliate with black hairs on the edges, the 

 longer hairs on the top edge longer than the width of the third joint, 

 those on the lower edge very short, last two joints of front tarsi infus- 

 cated; middle metatarsi about equal to their tibias in length; middle 

 trochanters with a black bristle; first and second joints of hind tarsi 

 nearly equal; middle and hind tarsi black; hind tibiae infuscated. 

 Halters, tegulae, and their cilia pale yellow. Wings narrowed at the 

 base, and with the costa much arcuated, the swell starting just before 

 the middle ; hind margin indented at the tip of the fifth and sixth veins ; 

 third vein much arcuated ; last section of fourth vein nearly in a straight 

 line with the basal part; wings hyaline, with a brownish cloud along the 

 costa, beginning at the same point as the swell and extending to the tip 

 of the fourth vein, fading out behind; a narrow faint cloud may be 

 traced along the fifth, and last section of the fourth vein; veins pale 

 yellow at the base of the wing, becoming brown on the disk. 



