96 THE CANADIAN ENTOMOLOGIST 



Length 5.25 mm. 



Type.— Port Hope, Ont., June 13, 1897, (W. Metcalfe). 



This species is separable from its allies by the bristling of the mid femur, 

 the postero-ventral bristles being much longer than in any of the other species, 

 the longest at least twice as long as the femoral diameter. 



A NEW SPECIES OF CCENOSIA FROM CANADA 

 (DIPTERA, ANTHOMYIID^). 



BY .1. R. MALLOCH, F.E.S., URBANA, ILL. 



The species described in this paper is one which was submitted for identi- 

 fication by the Dominion Entomologist. The type specimen is deposited in 

 the National Collection of Insects, Department of Agriculture, Ottawa. 



Ccenosia fuscifrons, sp. n. 



Male. — Black, covered with dense white pruinescence. Head black, with 

 white pruinescence except on interfrontalia; antenna? and palpi black; proboscis 

 brown. Thorax and abdomen unmarked, apices of abdominal segments yel- 

 lowish. Legs pale yellow, gradually darkened from near base of femora apicad, 

 the tibiie and tarsi usually fuscous, sometimes the bases of tibicC pale. Wings 

 while at bases, distinctly browned beyond to apices. Calyptra white. Halteres 

 >'ellow. 



Frons nearly twice as long as broad; orbits narrow, well defined, the 

 bristles long, upper pair shorter than second and ocellars; antennae reach- 

 ing over two-thirds of the distance to mouth-margin, third joint slightly 

 angulate at apex above; arista bare; parafacial in profile almost linear; 

 cheek higher than width of third antennal joint, the margin with a 

 few long, slender bristles. Humeral angle with one long and four 

 or five short, stout bristles; presutural acrostichals in an irregular single 

 or double series; intra-alar bristles weak; lower stigmatal bristle weak 

 or absent, when present directed laterad or slightly upward. Abdomen short, 

 cylindrical, dorsum with a few scattered setulose hairs; hypopygium small, 

 retracted; fifth sternite with a large V-shaped excision, the processes short and 

 broad. Legs long and slender, the bristles hair-like; basal joint of tarsi on all 

 legs at least half as long as tibiae; fore tibia with one median posterior bristle; 

 mid tibia with the two median bristles very short, situated at about the same 

 distance from base; hind tibia with the antero-ventral bristle very weak and 

 short, the antero-dorsal and preapical dorsal bristles each over one-third as 

 long as tibia. Inner cross-^'ein of wing below apex of first vein; third vein 

 ending in apex of wing; apex of fourth basad of apex of third. 



Length 2.25 mm. 



Type.— Brockvillc, Ont., August 12, 1903, (W. Metcalfe). Paratypes, 

 Ottawa, August 17, 1907, (j. Fletcher); Port Hope, Ont., May 14, 1897, (W. 

 Metcalfe). 



This species most closely resembles argentate Coquillett of the North 

 American fauna, but may readily be separated from that species by the narrower 

 frons and the colour of same, which is fuscous instead of silverv. 



Mailed April 28th, 1919. 



