the; mycetophilid.e of north amurica. 263 



lilaced near the middle of the subcosta; R=+3 is obHque and 

 ends in the costa; coalesced part of the media is one-third 

 shorter than the petiole ; anal vein is not produced to the 

 margin. Halteres yellow. Pine Lake, Wisconsin (W. M. 

 Wheeler) ; Black Mts., N. C. (Beutenmueller) ; Knoxville, 

 Tenn. 



23. Platyiira scapularis n. sp. 



Male. Length 5 to 6 mm. Head piceous, front subshining 

 black; the posterior eye margin, scape of antennae and clypeus 

 rufo-piceous ; flagellum fuscous, palpi and proboscis yellowish. 

 Mesonotum black subopaque, collar, scutellum, humeri, and 

 lateral margins to the base of the wings, articulations at base of 

 wing, junction of scutellum and metanotum, yellowish; the 

 metanotum including the prominent lateral lobes, pleura, and 

 sternum rufo-piceous. Setae of mesonotum, black, short, and 

 apparently not arranged in rows, but uniformly distributed, 

 most conspicuous at the base of the wing; those on the scutellum 

 numerous but short. Abdomen subopaque black, some of the 

 ventral segments more or less yellowish, particularly on the pos- 

 terior margins; hypopygium (fig. 105) black. Legs and coxse 

 yellow, the middle and hind coxse sometimes, and tarsi and 

 spurs, fuscous ; the black setulse of coxse conspicuous at tip ; 

 claws toothed ; fore metatarsus nine-tenths, the second fore 

 tarsal joint two-thirds as long as the tibia. Wing somewhat 

 smoky, apex from before the tip of R1+3, brown ; subcosta ends 

 in the costa before the base of the radial sector ; the subcostal 

 crossvein is situated proximad of the middle of the subcosta; 

 R2-I-3 slightly oblique, coalesced part of the media longer than 

 the petiole in length;' anal vein not reaching margin. Halteres 

 yellow. Kendrick, Idaho, and Stanford University, Calif. 

 (Prof. Aldrich). 



Female, and immature male. The humeri, lateral margins of 

 mesonotum, base of scutellum, and posterior margins of the 

 abdominal segments yellow. Females from Friday Harbor and 

 Moscow, Idaho. (Prof. Aldrich). 



