NO. 2115. NEW NEOTROPICAL MUSCOID FLIES— TOWNSEND. 425 



OESTROGASTROPSIS MEXICANA, new species. 



Length, of body, 6.5 mm. ; of wing, 6 mm. One female, San Rafael, 

 near Jicaltepec, Veracruz, March 29, 1896 (Townsend). 



Whole body silvery-cinereous, the face, orbits, and anterior half of 

 parafrontals more silvery-whitish. Frontalia and antennae dark 

 brown. Palpi rufous; legs blackish. Four blackish thoracic vittae, 

 all interrupted. Base of scutellum rich shining brown. Basal abdom- 

 inal segment nearly same brown, the hind borders of second and third 

 segments with a dark shade in some lights. Keel of anal segment 

 pale rufous, venter and sides showing some rufous. Wings clear. 

 Tegulae tawny-whitish. 



Holotype.—C&t. No. 19565, U.S.N.M. 



OESTROGASTRODES, new genus. 



Genotype. — Oestrogastrodes similis, new species. 



Differs from Oestrogastropsis as follows : 



Female. — Only two reclinate fronto-orbitals, the hind one weak. 

 The middle one of the three lateral scutellars is weaker, the hiad one 

 reaches barely to middle of second abdominal segment. No apical 

 pair of scutellars. Third abdominal segment with only two median 

 discals. Anal segment rounded on posterior aspect, the ventral 

 keeled portion short and terminating in an angle behind as seen in 

 profile. All tarsi longer than tibiae, the hind ones conspicuously so. 

 Apical cell open, ending distinctly before wingtip. Hind crossvein 

 oblique, not perpendicular to fourth vein, conspicuously approxi- 

 mated to cubitus. Antennae inserted above eye-middle. Arista 

 pubescent. Proclinate fronto-orbitals set farther forward. 



OESTROGASTRODES SIMILIS, new species. 



Length of body, 6.5 to 7.5 mm.; of wing, 6 to nearly 7 mm. Two 

 females, San Rafael, near Jicaltepec, Veracruz, Mexico, March 29, 

 1896 (Townsend), and Arajan, Panama, April 28, 1911 (A. Busck). 



Differs from Oestrogastropsis mezicana Townsend in coloration as 

 follows: Pollen silvery-white, the upper parts with a more or less pro- 

 nounced bright golden-yellow shade. The four thoracic vittae 

 heavier, the middle pair confluent behind suture in a rectangular rich 

 brown marking. Base of scutellum, all of first abdominal segment, 

 and broad hind borders of second and third segments rich shining 

 brown. Femora and front tibiae more or less yellow or yellowish. 

 Face and pleurae silvery-white. Antennae and palpi pale yellow, 

 the third antennal joint dusky apically. Wmgs faintly smoky, 

 tegulae white. 



Holotype.—C&t. No. 19609, U.S.N.M., Panama. The Veracruz 

 specunen may prove to be a distinct form. It is the smaller, and 

 shows in general duller colormg. 



