SYNOPSIS OF NORTH AMERICAN SYRPHID^. 113 



border. Abdomen only a little narrowed toward tbe base. Legs yel- 

 low ; front and middle femora toward the base, and a ring on bind 

 tibiae, blackish ; hind femora, except the base, bhick. Wings nearly 

 hyaline ; stigma pale yellow 5 a minute stump of a vein on the outer 

 cross- veins. 



Two specimens, Beverly, Massachusetts, May 8 (E. Burgess, National 

 Museum, Professor Riley's collection). This pretty species is very dis 

 tinct from K. globosa, in the larger, more elongate antennae, in the less 

 produced epistoma, in the less spatulate, broader at the base, and more 

 pointed abdomen, and in the nearly uniform bright metallic color. 



SPHEGINA. 



Sphegina 'Sleigen, Syst. Beschr., iii, ll>;3, 1622. 

 Small, nearly bare, slender species, black, brown, or yellow, more or 

 less shining. Antennae short, third joint rounded, the arista bare, basal. 

 Face deeply concave in proiile below the antennae, the epistoma por- 

 rected, not descending below the eyes. Eyes bare, separate in the 

 male; front of equal width, broader in the female. Abdomen twice or 

 thrici- as long as the thorax; at the base in the male pedicellate— in the 

 female much contracted, but not so slender ; third and fourth segments 

 expanded, especially in the female, and convex above. Legs slender; 

 hind femora much thickened, with short spines below ; hind metatarsi 

 thickened. Wings long and broad; marginal cell open, third vein 

 straight, anterior outer angle of first posterior cell rectangular or acute; 

 anterior cross-vein before the middle of discal cell. Type of genus, S. 

 clunipes Fallen, Europe. 



TABLE OF SPECIES. 



1. Wings large ; abdomeu short ; front iu female nearly as broad as long, infuscata 



Front iu female much longer than broad 2 



2. Fifth abdominal segment iu female considerably broader than long . . lobata 



Fifth segment in female but little broader than long 3 



3. Thorax more or less black rufiventris 



Thorax not at all black ( 9 ) Keeniana 



Sphegina Keeniana, n. sp. (Plate IV, fig. 11.) 



Habitat. — Pennsylvania ! 



9 . Length, 5 to 6™™. Front black, thickly dusted on the sides, leav- 

 ing a slender, shining stripe, interrupted in the middle. Antennae yel- 

 low, third joint rather large, orbicular. Face light yellow, blackish in 

 the middle above ; cheeks and occiput black, lightly dusted. Thorax 

 yellow; the dorsum and scutellum darker, with a reddish cast; the lower 

 part of the pleurae behind, brown. Abdomen yellow, broad behind; 

 first segment behind, obscure spots on the sides of the second segment 

 in front, and small spots on the posterior angles of the fourth and fifth 

 segments, blackish ; second and third segments on the posterior part 

 with a rather narrow, black cross-band; fifth segment moderately 



