304 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.43. 



be distinguished from Stomatomyia by the eyes being thinly but dis- 

 tinctly hairy. The type of Stomatomyia is S. Jllipalpis Rondani, 

 hereby designated. It has discal and marginal macrochsetse, while 

 Plagiops has only marginal. From Deuterammohia it differs in the 

 palpi being short, small, and filiform. From PlagiprospTierysa it 

 differs in the distinctly but thinly hairy eyes. In the female the 

 vertical and next three pairs of frontal bristles are differentiated by 

 being stronger than the anterior frontal bristles ; in the male the ver- 

 tical and next two pairs only have this character. 



Reproductive habit, oviposition on host of small flat-oval macro- 

 type eggs, without incubation; uterus absent. 



Type-species. — Plagiops meridionalis, new species. 



The following table will separate these forms: 



1. Palpi rudimentary, short, small, filiform 2 



Palpi filiform, but elongate; eyes thickly hairy, macrochsetse discal and mar- 

 ginal Stomatomyia. 



Palpi normal, somewhat thickened at tip, eyes bare or nearly so. .Deuterammohia. 



2. Eyes bare Plagiprospherysa. 



Eyes very distinctly but not thickly hairy, macrochgetaj only marginal in both 

 sexes Plagiops. 



PLAGIOPS MERmiONALIS. new species. 



Length of body, 6 to 7 mm. ; of wing, 4 to 5 mm. The males are 

 the larger. Two females and one male, Piura, Peru, June 11, 1911, 

 on foliage. 



Parafrontals in both sexes silvery pollinose with a faint golden 

 tinge, the golden being usually more pronounced in female. Fron- 

 talia rust-yellow, first two antennal joints reddish-yellow, third 

 joint and arista dark brown in male but the base of third jomt in 

 female reddish-yellow. Parafacials, cheeks, facial plate, and orbits 

 sUvery-white. Occiput silvery with gray pile, upper portions faintly 

 golden. Palpi yellowish. Pleurae and humeri deeply silvery; meso- 

 scutum and scutellum with pollen of a faint golden shade, five vittss 

 on former, the outer ones interrupted at suture, the next ones abbre- 

 viated at less than halfway behind suture; edges of scutellum yellow- 

 ish. First abdominal segment blackish, the other three segments 

 densely silvery pollinose with the same faint golden shade as front 

 and thoracic scutum, leaving an irregular broad posterior margin of 

 shining blackish. Legs dark brown, front femora pollinose exteriorly. 

 Wings clear, tegulse whitish. 



Type.— Cat. No. 15143, U.S.N.M. Female, June 11, 1911; TD 

 4064,/. r. s. 



