Vol. IX] VAN DU ZEE— NORTH AMERICAN MEDETERUS 263 



Described from one female taken by me at Sacramento, Cal., 

 June 4, 1915. The name was selected because the cross-vein 

 was further from the wing margin than in the known related 

 species. 



Holotype, female, in collection of the author. 



5. Medeterus aeneus, new species 



Male : Length 2 mm. Face dark green, shining but dulled with pollen ; 

 front opaque with gray pollen ; proboscis rather small, black ; antennae 

 small, black, third joint rounded at tip; arista apical; lower orbital cilia 

 pale. Mesonotum bronze brown with purplish or coppery reflections and 

 dulled with gray pollen, without any trace of a vitta; center of posterior 

 depressed area green; pleurae dulled with gray pollen, ground color 

 blackish with green reflections ; bristles above fore coxae yellowish ; acros- 

 tichal bristles small, in two rows ; an area of small bristles above the 

 humeri ; dorsal bristles small in front, larger posteriorly ; scutellum with 

 one pair of large bristles and a pair of minute hairs just in front of them 

 on the margin ; abdomen dark bronze green, first segment more bluish ; 

 hypopygium of moderate size, black, its appendages yellowish ; coxae and 

 femora black ; broad tips of femora, the tibiae and tarsi yellow ; last tarsal 

 joint of all feet black; fore tibiae mostly brownish; hind metatarsi half the 

 length of the second joint; tegulse and halteres yellowisih ; tegular cilia 

 white ; wings grayish hyaline ; last section of fourth vein slightly arched 

 so that the third and fourth veins are nearly parallel at their tips; last 

 section of fifth vein one and a fourth times as long as the cross-vein ; veins 

 black. 



Described from one male taken by me at Los Angeles, Calif., 

 Apr. 27, 1915. 



Holotype, male, in collection of the author. 



6. Medeterus cuneiformis, new species 



Female : Length 2 mm., of wing 2.5 mm. Face below the suture greenish 

 with thin gray pollen ; face above the suture and the front thickly covered 

 with gray pollen; proboscis rather small, black; antennae black, third joint 

 of moderate size, rounded, about as wide as long; arista subapical ; orbital 

 ciHa white, long; mesonotum and scutellum greenish gray, nearly opaque 

 with gray pollen and with a sharply defined, brown median vitta which 

 extends from the front almost to the hind margin of the scutellum ; scutel- 

 lum with one pair of bristles ; pleurae and coxae black, covered with gray 

 pollen ; fore coxae with pale hairs on the front surface ; acrostichal bristles 

 in two rows ; four dorso-central bristles on each side inserted im small 

 brown dots ; bristles above fore coxae small, white ; abdomen dark green 

 with pale hairs; femora black; broad tips of femora, the tibiae and tarsi 

 yellow; tarsi darkened towards their tips; second joint of hind tarsi one 

 and a half times as long as the first; tegulae and halteres yellow, cilia of 

 the tegulae white ; wings grayish hyaline, yellow at base, with a cuneiform, 

 brown spot filling the angle between the second and third veins at the base 

 of the third vein and extending a little back of that vein; third and fourth 



