J. R. MALLOCH . 167 



third joint brownish apioally; palpi whitish yellow; proboscis glossy black. 

 Thorax not vittate. Abdomen slightly testaceous on sides of two basal dorsal 

 segments; segments three and four with a pair of blackish spots, the bases 

 of the larger dorsal bristles set in black dots. Leg.s entirely yellowish testa- 

 ceous. Wings clear, veins yellow. Calyptrae white. Halteres pale yellow. 



Head at least 1.5 as wide as high when .seen from in front; frons one-third 

 as wide as head, orbits not differentiated, each orbit with three or four bristles, 

 the upper, backwardly directed one slightly shorter than the second and 

 ocellars; eyes almost hemispherical; parafacial, in profile, linear; cheek about 

 as high as width of third antennal joint, the latter twice as long as second, 

 its apex with a rather sharply produced upper angle; arista with very short 

 pubescence; vibrissa long and strong. Presutural acrostichals two-rowed, 

 rather long; lower stigmatal bristle very minute or absent. Legs short and 

 stout, the femora stouter than in most species of the genus; all tibial bristles 

 long and strong, the antero-dorsal one on mid tibia longer than the postero- 

 dorsal; hind tibia with one or two long setulae on middle of postero-dorsal 

 surface; basal joint of hind tarsus less than one-third as long as tibia, with 

 a short basal ventral bristle. Veins three and four parallel on apical sec- 

 tions, their apices in nearly vertical line. Length, 3.25 nun. 



Type.— Cedar Lake, Lake County, Illinois, August 4, 1906, in 

 a tamarack grove, [Illinois]. 



Coenosia johnsoni sp. n. 



MdU'. — Black, opaque, densely gray pruine.scent. Interfrontalia o])aque 

 black when seen from above, remainder of head gray i)ruinescent; base of 

 third antennal joint yellowish. Thorax not vittate. Abdomen with three 

 I)airs of rather faint brown spots on dorsinn; hypopygium and greater por- 

 tion of fifth sternite brownish. Legs entirely yellow. Wings slightly yellow- 

 ish. Calyptrae and halteres nearly white. 



Head as high as broad; frons about one-third as wide as head; each orbit 

 with four bristles and a few hairs; parafacial very narrow; antennae not 

 extending over three-fourths of the distance to mouth; third joint not sharply 

 angulate; arista pubescent. Thoracic bristles longer and stronger than 

 those of abdomen; acrostichals two-rowed. Abdomen elongate, cylindrical; 

 hyi)opygium of moderate size; processes of fifth sternite about twice as long 

 as broad, with long hairs on their inner halves and some strong bristles apic- 

 ally. Femoral bristles long, rather irregularly alternately long and short; 

 femora stouter than usual; tibial bristles normal in number, not very long; 

 hind tarsus not as long as tibia, basal joint less than one-third of the tibial 

 length. Wing over 2.5 as long as broad. Length, 5 mm. 



Typc—d"; Oold Rock, Ontario, Canada, July 21, 1905, (H. H. 

 Xewconili), [Illinois]. 



Coenosia dorsovittata sp. n. 



Male. — Black, subojiaque, densely gray jjruinescent. Head black, with 

 silvery white pruinescence; antennae and interfrontalia with less conspicuous 



TKANS. ,\M. ENT. SOC, XLVl. 



