54 Annals Entomological Society of America [Vol. VI, 



their tibiae, remaining four joints together about one-fifth, or one sixth 

 as long as the first, third and fourth not much longer than broad, second 

 about the length of the two following, the third with a long hair at tip; 

 middle metatarsi about as long as their tibiae; first joint of hind tarsi 

 longer than the second. Wings hyaline, little tinged with grayish; 

 third vein only slightly curved at tip, last section of fourth vein approach- 

 ing third from the cross- vein slightly sinuous, the tip not far from the 

 tip of third, ending in front of the apex of the wing. 



Female: Front tarsi normal, with the first joint about three-fourths 

 as long as their tibiae, front coxae with yellow hairs and black bristles; 

 first and second joints of hind tarsi about equal; otherwise as in the 

 male. 



Redescribed from many specimens. Ont., Que., N. H., 

 Mass., Fla., Ind., Mich., 111., S. D., and Washington, D. C; 

 taken during Jime, July, and September. 



Note. — Dr. Loew in his description of this species says that 

 the upper orbital cilia are black, but I can see only pale cilia in 

 the specimens I have examined. 



26 Neurigona setosa n. sp. 



Figure 26. 



Thorax dull green; abdomen yellow with black bands; hypopygium 

 yellow; middle and hind coxk with a prominent black bristle on the 

 outside. Length 3-3 K mm. 



Male : Face narrow, of nearly equal width and silvery white ; front 

 and occiput greenish with white pollen; antenna yellow, third joint and 

 arista dark brown. Thorax dull greenish with yellowish pollen; the 

 flattened space before the scutellum poorly defined, and with a depressed 

 line in the center; pleura) black with white pollen; humeri, meta- 

 thoracic epimera, halters, and the root of the wing yellow; scutellum 

 dull green with yellowish pollen, with the lower edge yellow, and a 

 slightly elevated central ridge on the disk ; metanotum black with white 

 pollen; acrostichal bristles distinct, in two rows. Abdomen yellow; 

 second segment with a very narrow, the third with a wider metallic 

 greenish black band on the hind margin; fourth and fifth segments 

 entirely metallic greenish black; venter 3^ellow; hairs of the abdomen 

 yellow ; the black bristles on the hind margin of the first segment rather 

 short; fourth and fifth segments ciliate with long yellow bristles on the 

 lower lateral edges, these bristles more brown in certain lights; hypo- 

 pygium yellow, brownish on the basal edge, with several yellow and 

 two black appendages, the latter curved, mandible like, with a blunt 

 triangular tooth on the inner edge near the center, and with long yellow 

 hairs on the outside. Cox« and legs yellow; hairs and bristles on the 

 front side of the front and middle coxae yellow; middle and hind coxae 

 each with a large black bristle on the outside; middle and hind femora 

 each with a black bristle near the tip on the outside; middle femora 

 ciliate with short yellow bristles on the lower surface towards the 



