67 



2. Xantliogramma felix n. sp. «. 



Female. — Face and cheeks yellow (in all my specimens, except one, the face 

 has the hrownish-red tiut^e, which the faces of Syrphi sometime assume); 

 vertex dark metallic green, emitting a stripe of the same color, which reaches 

 the base of the antennae, where it expands a little ; between this stripe and the 

 eyes, the front is yellow. Antennae black, sometimes faintly reddish on the 

 under side, near the suture of the second and third joints; third joint rather 

 large, oval, blunt. Thoracic dorsum of a rather bright metallic green ; on 

 each side a yellow stripe runs from the humerus to the callosity near the 

 scutel ; the latter yellow, its extreme base and corners blackish or brown. 

 Pleurae with a large, ill-defined yellow spot below the wings. First abdominal 

 segment with a yellow spot each side (just under the halteres) ; the first cross- 

 band (on the second segment) is either interrupted by a very narrow black line 

 in the middle, or entire ; the second band is coarctate in the middle, its hind 

 margin being a shallow obtuse angle; the same may be said of the third band, 

 except that the obtuse angle is deeper and often has a notch in the middle, 

 which sometimes cuts the band in two; there is a narrow fourth band at the 

 base of the fifth segment, encroaching upon the hind margin of the preced- 

 ing segment; the fifth segment has a narrow yellow posterior margin. Legs 

 yellow, hind legs black or brown, excejjt the base of the femora and a space 

 on both sides of the knees. Wings with a distinct brownish tinge on their 

 distal half, anteriorly; stigma brownish; sometimes the whole wing has a 

 brownish-yellow tinge. Length, 9}2~^*^/2 ^^^- ^^• 



Habitat, Westpoint, N. Y., in Sept. 8-10, three females ; Illinois; 

 Pennsylvania. (The specimen from the latter locality is smaller, 

 wings more hyaline, legs and antennae of a paler color.) The first 

 and third band are as often interrupted as not; the second often 

 shows a vestige of an interruption in the shape of an indistinct 

 blackish line in the middle. 



3. Brachyopa racua n. sp. i. 



Brownish gray, thorax with three brown stripes; abdomen brown, its basal 

 third whitish yellew, with a brown line in the middle; arista bare. Length, 

 8-9 m. m. 



Face, front and vertex densely clothed with a grayish pollen; loAver part of 

 the face very much projecting; a brownish stripe runs across the cheek, from 

 the eye to the mouth; antennae brownish, grayish pollinose ; arista bare. 

 brown, reddish at base. Thoracic dorsum yellowish-gray, with three brown 

 stripes; the intermediate one geminate and abbreviated posteriorly. Scu- 

 tellum brownish-yellow. Abdomen brown, shining; first and second seg- 

 ment whitish yellow (as if translucent), the second brown posteriorly and 

 with a longitudinal brown line in the middle. Legs grayish brown; liind 

 femora slightly incrassate on the under side, with a brush of short spine-like 



