J. R. MALLOCH 177 



of iiuirji;iiiul bristles; arista inibescent; third antennal joint twice as long as 

 second. Post humeral bristle duplicated, no setae adjacent to it; prealar 

 bristle long; prosternal plate almost parallel-sided anteriorly. Abdomen 

 subcjdindrical, slightly tapered; fifth stcrnite with moderately long processes 

 which are rounded apically and unchitinised, have some very fine hairs along 

 inner margins and some long bristles on apical half. Fore tibia with an 

 antero-dorsal and a posterior bristle; fore tarsus much longer than fore tibia; 

 mid femur with two antero-ventral bristles, one near base and the other near 

 apex, and a strong postero-ventral bristle near base; mid tibia with one antero- 

 dorsal, one postero-donsal, and one or two posterior bristles; hind femur 

 with an irregular series of antero-ventral bristles, and three or four strong 

 bristles on basal half of postero-ventral surface, the surface hairs long; hind 

 tibia with one antero-ventral, two antero-dorsal and two postcro-dorsal 

 bristles, and a posterior bristle near base, which is most excei)tional in tliis 

 genus. Costal thorn moderately long. Length, (3 mm. 



Type. — d^ ; Nain, Labrador, August, 1918, [Illinois]. 



Pegomyia triseta sp. u. 



Male. — Yellowish or reildisli testaceous. Back of head, cheeks and orbits 

 blackened, gray pruinose; antennae rufous yellow, third joint infuscated 

 on outer side except basally; palpi yellow. Thorax with the exception of 

 the anterior lateral angles and the scutellum black, gray pruinose, the dorsum 

 indistinctly vittate. Abdomen slightly gray pruino.se on dorsum, and with 

 a darker, reddish testaceous dorso-central vitta. Leg.s reddish testaceous, 

 th? tarsi infuscated. Wings, calyptrae, and halteres yellowish. 



Eyes separated by about the width of anterior ocellus; third antennal 

 joint about 2.75 as long as second; parafacial narrower than third antennal 

 joint at base of antennae, much narrowed below; cheek barely half as high 

 as length of third antennal joint. Thorax with two or three pairs of strong 

 l)resutural acrostichals and beside them some weaker hairs; prealar not over 

 one-third as long as the bristle behind it; posthumeral bristle duplicated; 

 sternopleurals 1:2; one or two hairs at base of stigmatal bristle. Abdomen 

 depressed; second tergite longest; hypopygium small; fifth sternite with the 

 l)rocesses rather short, not broad, unchitinised, the surface clo.se to inner 

 margins with rather dense erect short black hairs, but not fringed. Fore 

 tibia with an antero-dorsal and one or two i)osterior bristles; mid tibia as 

 in i)receding species; hind femur with similar armature to that of preceding 

 species; hind tibia with one antero-ventral, three or four antero-dorsal and 

 usually three postero-dorsal bristles. Veins three and four slightly con- 

 vergent apically. Lower ctdyptra slightly protruded. Length, 6 mm. 



Tijpe. — cT; Cottage Beaulieu, Montreal, Canada. June U, 

 1906, [Illinois]. Paratypes. — Two males; Auburndale, Tvlassa- 

 chusetts, June 13, 1908, (C. W. Johnson). 



TRANS. AM. ENT. .SOC, XLVI. 



