NO. 193r.. MU8C0ID FLIES FROM SOUTH AMERICA— TOWNSEND. 339 



bristles on scutellum, one very weak pair between these, one weak 

 decussate apical pair, one weak separated discal pair. The posterior 

 one of the two strong lateral pairs reaches beyond base of third abdom- 

 inal segment when well appressed. No true macrochsetae whatever 

 on first abdominal segment even on sides, one short median marginal 

 pair on second, with two lateral ones on each side, a row of ten mar- 

 ginal on third segment, and a marginal and discal row on fourth, the 

 anal discal ones weaker in female Hind tibiae equally pectinate in 

 both sexes, with a stronger hardly longer bristle or two near middle. 

 Claws nearly equal in both sexes, fairly short. Venation typical, 

 apical cell open and ending well before wing tip, fourth vein without 

 stump or wrinkle at bend, hind cross vein nearer to bend of fourth. 



Reproductive habit, leaf-oviposition ; uterus short and thick, with 

 black microtype eggs. 



Type-species. — Metopiops mirabilis, new species. 



METOPIOPS MIRABILIS, new species. 



Length of body of female 6 mm., of male 7 mm. ; wing of female 

 4.5 mm., of male 5 mm. Three females and two males. Piura 

 and Chapair^, in valley of Rio Piura, Peru, June 19, 1910, to May 

 21, 1911, on foliage. 



Parafrontals, parafacials, cheeks, and orbits of female deep golden 

 pollinose throughout, sometimes the orbits nearly silvery; corre- 

 sponding parts of male burnished silvery-white, but the orbits, vertex, 

 and cheeks have a very faint golden tinge in some lights. Facial 

 plate and facialia of male dull silvery, those of female ashy. Occiput 

 ashy. Frontalia of female brown, not visible in male or only slightly 

 so. Antennae of male wholly blackish, the first two joints in female 

 sometimes reddish. Palpi of female brownish-yellow, those of male 

 reddish-brown or brownish. Thorax silvery pollinose, thinly so on 

 mesoscutum, with a tinge of golden on pleurae and sides and middle 

 of mesoscutum in male, but only a faint suggestion of golden in 

 female. The usual four vittae on thorax, the two median vittae 

 narrow and distinct, the outer ones broad, broken, and obscure; a 

 short, more or less distinct fifth vitta between the median pair behind. 

 Scutellum pale brick-yellowish, thinly silvery. Second to fourth 

 abdominal segments silvery pollinose, with a faint tinge of golden in 

 female and a distinct golden shade in male, only the narrow hind 

 borders of second and third segments brownish ; first segment brown. 

 Venter silvery, last segment faintly golden in female, distinctly so in 

 male. Ground color of abdomen shows reddish on sides and venter 

 in both sexes. Legs black, wings clear. Tegulae whitish, faintly 

 bordered with yellowish. 



Type.—Csit. No. 15178, U.S.N.M. Female, Chapair^, May 21, 1911 ; 

 TD4056,/. r. s. 



Cotype, female, June 19, 1910; TD 3919, ch., m., cph. sk. 



