l8o MAINE AGRICULTURAL EXPERIMENT STATION. I9IO. 



segments wholly black; hairs black. Hypopygium (fig. 137) 

 dusky yellow, resembling that of M. bicolor Dzied, forceps 

 slender, acuminate, the central "processus" truncate, with lat- 

 eral setse near the tip and projecting far beyond the superior 

 forceps. Legs slender, dusky yellow, fore metatarsus i.i 

 times as long as its tibia ; each middle coxae with a cepha- 

 lad projecting sickle-shaped spur which is about 1-3 as long 

 as the fore metatarsus ; setse of hind tibiae little longer than 

 the diameter of the member. Hind coxse outwardly for the 

 most part brown. Wings (fig. 106) hyaline, slightly cine- 

 reous tinged ; subcosta ends in the costa opposite the distal 

 end of the small cell; subcostal crossvein is before the middle 

 of this cell, which is about twice as long as wide ; R^^g ends 

 beyond the tip of the wing; petiole of the media is % as 

 long as Mo; cubitus forks proximad of the R-M crossvein. 

 The wing is 6.5 mm. long, which is 2.1 times as long as the fore 

 metatarsus. Halteres yellow. One specimen from Maine taken 

 by Mr. Owen Bryant in August. 



Female. A specimen taken at the same time and place differs 

 as follows : lower margin of pleura is dark ; the yellow of the 

 abdominal tergites is confined to a posterior fascia, the fore 

 metatarsus and tibia are subequal ; coxal spurs wanting ; sub- 

 costa interrupted at the tip ; subcostal crossvein slightly distad 

 of the middle of cell R^ ; cubitus forks only slightly proximad 

 of the R-M crossvein. Wing is three times as long as the fore 

 metatarsus. 



15. Mycomya sigma n. sp. 

 Male. Length 4 mm. Head, face, and antennae brownish, 

 the basal joints of the last and the palpi yellow; intermediate 

 antennal joints but little longer than wide. Thorax yellow, the 

 three dorsal stripes dark reddish brown, the middle one broad 

 on anterior margin, tapering and not reaching the scutellum; 

 the laterals abbreviately anteriorly and broadened posteriorly; 

 metanotum and lower margins of pleura also brown ; the two 

 scutellar bristles and the setae of mesonotum brown. Abdomen 

 brown, posterior and lateral margin a little more yellowish, 

 margins not sharply defined; hairs pale. Hypopygium (fig. 

 138) yellow; forceps short and slender, intermediate appendages 

 lanceolate and acute and the "processus" consisting of a pair of 

 slender, slightly clavate median lobes. Legs long and slender, 



I 



