A NEW Notoschoenomyza MALLOCH AND A KEY TO THE SPECIES (DIPTERA, MUSCIDAE, COENOSIINAE)

A new species of Notoschoenomyza Malloch, N. diminuta sp. nov. from Chile, is described and the male and female terminalia are illustrated. A key to the identification of all Notoschoenomyza species is presented.

The purpose of the present paper is to describe one new species: Notoschoenomyza diminuta and to present a key for all known species.

MATERIAL AND METHODS
The material examined belongs to the Canadian National Collection of Insects, Ottawa, Canada (CNC), as well as to the Museu Nacional, Rio de Janeiro, Brazil (MNRJ).
The terminalia of the holotype and of the female paratype were prepared in a solution of potassium hydroxide at 10%, and in a water-bath for ten minutes.They were then dissected in glycerol and drawn and packed in a microtube with glycerol and fixed to a straight pin together with the specimen.

Notoschoenomyza diminuta sp. nov.
Diagnosis.Palpus yellow, frons and face golden, antennae dark brown, apex of femur and base of the tibia reddish-brown.
Colour. Brown with grey pollinosity.Head with frons, face, fronto-orbital plate, and gena golden; antenna, arista, ocellar triangle, and occiput dark brown; palpus yellow.Mesonotum with four brown stripes at dorsocentral and intra-alar row of bristles.Calypters white; haltere yellow; wing brownish with brown veins.Legs brown with grey pollinosity, apex of femur and base of tibia reddish brown; pulvillus white; claw black.
Length.Male: Body: 2.7 mm to 3.4 mm Wing: 2.6 mm to 2.9 mm Head.Eye facets of same size.Four pairs of strong frontal setae with short and fine setae inserted between them, the upper reclinate.Inner vertical seta strong, long, and convergent.Outer vertical seta strong, long, and divergent.Ocellar seta strong, long, and divergent.Postocellar seta fine, small, and divergent.Arista bare.Vibrissa strong and long; 1-2 supravibrissal setulae.
Thorax.Acrostichal setulae ciliform; dorsocentrals setae 1:3; 2 humerals; 1 post-humeral; 1 presutural and 2 post-sutural intra-alars; 2 supraalars.Scutellum with one pair of basal and two pairs of apical bristles strong, all long and convergent.Notopleuron with two bristles, the anterior longer.Anepisternum with a row of 5-7 bristles.Fore femur with a row of anterodorsal and ventral bristles.Fore tibia with a median anterior and posterior bristles, a pre-apical dorsal and an apical anteroventral; pretarsi with a basal ventral bristle measuring about less than the sum of length of the remaining tarsomeres; claws and pulvillus developed.Mid femur with a row of anterior bristles, a ventral bristle on basal third, 1-3 anteroventral bristles on basal third and a preapical posterodorsal bristle.Mid-tibia with supramedian and submedian anterodorsal bristles; supramedian, median, and preapical posterodorsal bristles, a preapical dorsal bristle, and an apical anteroventral, ventral, posteroventral, and anterior bristles; tarsi.Hind femur with an irregular row of anterodorsal and anteroventral bristles and preapical dorsal bristle.
Terminalia.Cercal plate longer and fine, anterior margin with a deep incision and posterior margin with a shallow incision.Surstyli with round apex (Figs. 2, 3).Hypandrium tubular and long (Fig. 4).
Female: Length.Body: 3.8 mm Wing: 3.0 mm Differs from male only in the median bristle in hind tibia, which is stronger than in the male.
Etymology.The epithet refers to the small size of the species in comparison with the other congeneres.