Vol. IX] VAN DUZEE— NORTH AMERICAN MEDETERUS 269 



the knees dark yellowish; the second joint of hind tarsus one and three- 

 fourths times as long as first. Tegulae and halteres brown, the former with 

 brownish cilia showing white reflections in certain lights. Wings tinged 

 with grayish ; veins brown ; venation normal. In the male the last section 

 of the fifth vein is three-fourths as long, in the female a little longer than, 

 the cross-vein; tips of third and fourth veins rather closely approximated 

 in the female, slightly more widely separated in the male ; fourth vein end- 

 ing almost exactly in the apex of the wing. 



Described from two males and one female from Ashland, 

 Oregon, reared June 16, 1916, from Pinus ponder osa, by F. P. 

 Keen. This species differs from maurus Wh. in having the 

 antennae darker, the cross-vein nearer the margin of the wing, 

 the middle tibiae wholly black in both male and female (in 

 maurus they are yellow in the male), and the appendages of 

 the hypopygium black, yellowish in maurus. 



Holotype, male, and allotype, female, in collection of the 

 United States National Museum ; paratype in collection of the 

 author. 



16. Medeterus planipes, new species 



Male : Length 2.8 mm. Face, front, and thorax bright shining green 

 with violet reflections; dorsum of thorax with a little brownish gray pol- 

 len; antennae blackish, small with slender arista; orbital cilia and bristles 

 above fore coxae black ; scutellum with four bristles ; abdomen shining 

 green ; hypopygium stout, not elongated, black with slender yellowish ap- 

 pendages ; fore coxae black with yellow tips ; middle and hind coxae yel- 

 lowish ; trochanters yellow ; femora black with yellow hairs ; tibiae and 

 tarsi pale yellow with fifth tarsal joint black and small, nearly as wide as 

 long ; fore tarsi plain, tapering from base to tip ; fourth and fifth joints 

 of nearly equal length; hind metatarsi a little shorter than the second joint; 

 tibiae with pale hairs ; middle tibiae with one black bristle above, three on 

 the side on basal third, and black spurs at tip; posterior pair with a few 

 yellow bristles near the tip and one black bristle near the base and another 

 at tip; tegulae brownish, their cilia and the halteres yellow; wings grayish 

 with typical venation ; last section of fifth vein about as long as the cross- 

 vein; costa brown, veins yellowish. 



Female : A female taken with the male described above has the first 

 antennal joint yellow and all coxae blackish. 



Described from one male and one female taken at Los 

 Amates, Guatemala, Feb. 18. 



Holotype, male, and allotype, female, in collection of the 

 author. 



17. Medeterus flavipes, new species 



Male : Length 3 mm. Face and front violet, shining ; thorax green 

 with violet reflections on its anterior half, almost wholly violet along the 

 front ; abdomen shining green ; antennae black small ; lower orbital cilia 

 black, but with pale hairs on the lower part of the head behind the cilia ; 



