FUNGUS GNATS OF NORTH AMERICA. 1 59 



of the middle of cell R^ ; subcosta ends in the 

 costa (fig. 99). 5. indnlgens n. sp. 



aa. Media forks proximad of the apex of the cell R^ which is 

 more than 3 times as long as wide. 

 b. Apex of cells R^^- and M^ nearly hyaline. St. Vin- 

 cent Isl., W. I. 6. maculipennis. 

 bb. Apex of cells R^+g and M, broadly brown clouded. 



c. The brown cloud covering R2+3 produced across 

 the media ; subcostal crossvein proximad of the 

 apex of the very oblique basal section of the 

 radial sector (fig. 100). 7. illustris n. sp. 



cc. The brown cloud covering R2+3 not produced; a 

 brown cloud behind Cu, ; abdominal segments 

 bimaculate (fig. 97). 8. balioptera. 



I. Necempheria macular is n. sp. 

 Male. Length 4 mm. Head and antennae yellow, the latter 

 slightly darker apically ; palpi dark brown, ocellar tubercle 

 black; second joint of scape with a black seta on dorsal side 

 near apex, the basal joints of flagellum over twice as long as 

 wide, the apical end of each joint of flagellum except the first 

 with setulas more erect than on the remainder of the joint. The 

 pleura, sternum, scutellum, and lateral margin of mesonotum 

 pale yellow ; the dorsum pale brown, margined with darker 

 brown, on the paler portion are 2 fine longitudinal lines which 

 converge and meet in the vertex of an elongate triangular brown 

 spot just cephalad of the scutellum; metanotum brown. The 

 lateral margins of the mesonotum are provided with black setae, 

 more conspicuous at the base of the wings, also a few on ante- 

 rior margin and just cephalad of scutellum, a few small ones 

 on the dorsum, two longer ones on the scutellum. Tergites of 

 the first, third, fifth and a larger part of the sixth segment of the 

 abdomen dark brown ; a spot near the anterior margin of the 

 second and fourth and produced in a median line ; the remain- 

 ing parts, venter, and hypopygium (fig. 130) yellow. Legs 

 yellow, tarsi more dusky, fore metatarsus is over 0.9 as long 

 as the tibia ; setae of fore tibiae few and short, those of middle 

 and hind pairs more numerous, the longest about as long as the 

 diameter of the tibia ; spurs black ; claws with one tooth each. 

 Wings (fig. 98) hyaline, with a spot covering the small cell and 

 the R-M crossvein but not reachinq; the cubitus, another cover- 



