262 MAINi; AGRICUI.TURAI, i^XP^RIMI^NT STATION. I909. 



the coalesced part of the media is about 2-3 as long as the 

 petiole; the anal vein does not reach the margin. These char- 

 acters are also possessed by the type in the Cambridge museum. 



21, Platyura inoerens n. sp. 



Male and female. Length 5 mm. Head, palpi, and scape 

 yellow; the middle of the front surrounding the ocelli and the 

 flagella brown. Thorax wholly yellow, with only faint indica- 

 tions of darker lines ; setae black, not arranged in' longitudinal 

 lines. Abdomen yellow, the immediate bases of the segments 

 more or less brownish, especially in the female; hypopygium. 

 as figured (fig. 96). Legs yellow, tarsi appearing darker due 

 to black setulse; fore metatarsus 1.14, the second tarsal joint 

 0.94 times the tibia in length. Wings (fig. 84) yellowish 

 hyaline; the subcosta ends in the costa before the base of the 

 radial sector ; the subcostal crossvein is about in the middle of 

 the subcosta; R2-I-3 is oblique; coalesced part of the media 

 about one-third longer than the petiole ; anal vein not produced 

 to the margin ; a pale brown diffuse preapical fascia extends 

 from between R2+3 and apex of the costa to beyond the media, 

 quite faint posteriorly. Halteres yellow. Friday Harbor 

 Washington, July, from Professor Aldrich. 



22. Platyura genualis n. sp. 



Male and female. Length 5-| mm. Head and mouth parts 

 yellow; the flagellum and a spot covering ocelli and extending 

 to the occiput, brown. Thorax yellow with only faint indica- 

 tions of ferruginous stripes; metanotum with brownish spot; 

 setse of the mesonotum black, very few in number except at the 

 base of the wing and on posterior margin where they are longer 

 and more conspicuous. Abdomen, including venter, yellow ; 

 basal third or fourth of segment with a brown fascia which 

 may be more or less emarginate ; setse few, black ; hypopygium 

 stout, (fig. 100) yellow, setae black. Legs yellow, tarsi appar- 

 ently fuscous; fore metatarsus subequal to, second fore tarsal 

 joint about two-thirds as long as its tibia; empodium small, 

 pectinate, claws each with two stotit teeth. Wing hyaline, cloud 

 at apex of costa extends indistinctly to M2; subcosta ends 

 before the base of the radial sector ; the subcostal crossvein is 



