239 



slight, pale polHnosity; palpi and proboscis brown; postocular cilia 

 whitish. Mcsonotiim metallic bliie-black, becoming cupreous on the 

 posterior half, without distinct pollinosity ; scutellum more greenish ; 

 pleura; black, slightly shining and without metallic luster. Abdomen 

 black-brown, shining, with a bluish luster on dorsum ; ventral append- 

 ages of hypopygium yellow. Legs yellow, mid and hind cox?e black- 

 ened at bases, tarsi brownish towards the apices. Tegula: yellowish, 

 fringe concolorous. Wings clear, the anterior half slightly grayish, 

 veins brown. All bristles black. 



Frons distinctly over one third the width of the head, becoming 

 narrower anteriorly ; face linear, distinct only below antennre, in the 

 form of a small triangle ; palpi and proboscis very small ; head 

 distinctly higher than long, the antennae inserted slightly above the 

 middle ; eyes slightly pubescent, the facets distinctly enlarged below 

 level of antenna? on an area bordering the face; third antennal joint 

 elongated, acutely pointed, and very distinctly pilose (PI. XIII, Fig. 

 1 1 ) ; arista in type very short, possibly broken. Legs slender, slightly 

 hairy, the hairs especially noticeable the whole length of the antero- 

 dorsal surface of the hind tibia? and on the same surface of the basal 

 joint of the hind tarsus; the mid femora have a row of distinct 

 bristles the whole length of the postero-ventral surface; mid tibia with 

 a rather distinct bristle at basal third on the antero-dorsal surface; 

 hind femora much less strongly bristled than the mid pair, the hair- 

 like bristles confined to the antero-ventral surface. Wings with cross 

 vein at middle ; veins 3-4 slightly divergent ; costa very short-haired, 

 unthickened. 



Length, 1.5 tnm. 



Locality, New Orleans, Louisiana (S. A. Forbes). 



This species resembles actitns Aldrich in the shape of the third 

 antennal joint, but differs in several essential characters from the 

 description of that species as given by Aldrich. 



Chrysotus flavisetus, n. sp. 



Male. — Metallic green. Frons dark metallic green, anteriorly 

 white pollinose; face thickly covered with silvery pollinosity which 

 almost obscures the green ground-color; antennae black-brown, arista 

 concolorous; palpi white; proboscis brownish; postocular cilia whitish. 

 Mesonotum emerald green, with distinct whitish pollinosity; scutellum 

 with a bluish tinge ; pleurae black, posteriorly opaque, anteriorly with 

 a metallic, bluish luster. Abdomen rather darker than the mesonotum, 

 the dorsum with a cupreous tinge; the slightly projecting ventral 

 appendages of the hypopygium yellow. Tegulae, tegular fringe, and 



