154 ENTOMOLOGICAL NEWS. [May, 



I append descriptions of the two new species: 



Xiphandrium americanum n. sp. 



Male. Length 2.5 mm.; length wings 2.25 mm. Slender species; pro- 

 boscis small, black; palpi rather large, yellow, with several stout black 

 hairs. Face metallic green, with golden reflection, covered with an almost 

 imperceptible layer of white dust. Antennas black, nearly as long as the 

 head and thorax; first joint slender, without hairs; second joint rounded, 

 transverse, with a few stout black hairs; third joint about two-thirds the 

 breadth of the head, broad at the base, but suddenly narrowing to a long,, 

 thin and very gradually tapering apical portion; the whole joint covered 

 with long and distinct gray hairs; the thick and distinctly pubescent arista 

 bent at an angle with the third joint and about one-third its length. Front 

 rather bright metallic green; inferior orbit with a long and conspicuous 

 beard of white cilia. Thorax and scutellum bright metallic green with 

 golden reflection; in some specimens considerably dimmed by a layer of 

 whitish dust; pleurae metallic green with a layer of light-colored dust; 

 scutellum naked, with only the usual bristles. Abdomen bright metallic 

 green with golden reflection, somewhat darker towards the posterior end; 

 covered with short black hairs; base of the small embedded hypopygium 

 black, the tips of the appendages yellowish or piceous; posterior pair of 

 appendages short and conical, directed at right angles to the long axis of 

 the abdomen, with long and conspicuous hairs; anterior pair of appen- 

 dages considerably larger, spatulate, less hairy and directed forwards; 

 coxae black, with whitish dust; fore coxae with yellow tips and glistening 

 white hairs on their anterior surfaces. Legs plain, covered with short, 

 but distinct black hairs; fore and middle pairs yellow; fore femora with a 

 conspicuous black streak along their outer faces; hind femora black with 

 a metallic greenish tinge, covered with whitish dust and with yellow tips; 

 all the tarsi infuscated from the tips of the first joint. Wings hyaline, 

 distinctly narrower towards their bases; posterior cross-vein distant about 

 one and one-half times its own length from the posterior margin, forming 

 a right angle with the third longitudinal vein; apical segment of the fourth 

 vein perfectly parallel with the third and terminating in the tip of the wing; 

 tegulae white, with pale cilia; halteres lemon-yellow. 



Female. Length 2 mm.; length of wings 2 mm. Face considerably 

 broader and less brilliantly metallic than in the male, with a thicker layer 

 of pale dust; first and second antennal joints like those of the male; third 

 joint hardly longer than broad, with the same kind of glistening gray 

 hairs as in the male; the apically inserted arista strongly pubescent, much 

 longer than that of the male, being nearly two-thirds the breadth of the 

 head in length and exhibiting the same S-shaped curvature as the elon- 

 gated third joint of the male antenna. The white beard of cilia on the 

 inferior orbit nearly as conspicuous as in tne male; the black stripe on the 

 fore femora less distinct; all the tarsi black from the tip of the first joint. 

 Wing not narrowed at the base; anal angle prominent; posterior cross- 

 vein somewhat further removed from the margin than in the male. 



