yo. 1985. MU8C0ID FLIES FROM SOUTH AMERICA-^WOWNSEND. 313 



Jaen, northern Peru, about 5,000 feet, September 12, 1911, on 

 foliage. 



Differs from Wiedemann's description of T. pyrrhaspis by having 

 the mesoscutum deeply golden instead of sulphur-yellow, and the 

 third abdominal segment , wholly rust-j^^ellow. The frontalia are 

 brown. The entire fourth segment above and below is velvety- 

 black. The hairs of the abdomen appear black on the third and 

 fourth segments. 



This is evidently the genus Tropidopsis. It does not belong to the 

 HystriciidsB, but is a member of the subfamily Pyrrhosiinse of the 

 ExoristidaB. This is indicated by its comparatively slight epistomal 

 production on level with the vibrissal angles, the frontal bristles 

 descending but little below base of antennae, the structure of antennae, 

 the venation and the rather weak spinelike macrochaetae. The tarsi 

 are much elongated, the metatarsi being over half the length of tibiae. 

 The genus closely approximates the tribe Saundersiini in general 

 habitus. 



Type.— C&t. No. 15151 U.S.N.M. 



Probably deposits colored maggots, but not on foliage. 



NEOTRAFOIA, new genus. 



General characters of Trafoia, which form it apparently represents 

 in the South American mountain regions. A pair of strong widely 

 divergent ocellar bristles, long and slightly reclinate. Third antennal 

 joint about three times as long as second, which is not elongate. 

 Vibrissae removed from oral margin, which is moderately prominent ; 

 three or four bristles above vibrissae. Three pairs of strong decussate 

 frontal bristles above antennae, four or five pairs below. Two strong 

 proclinate orbital bristles in female, no inner or upper orbitals. Outer 

 vertical a little shorter than inner vertical bristles. Eyes thickly 

 long-hairy. Cheeks less than one-half eye-height, female front about 

 equal to eye-width, parafacials a little narrowed below, arista thick- 

 ened on a little more than basal one-third. Proboscis short, palpi 

 elongate and widened at tip. 



Three sternopleural and three postsutural bristles. Two long lat- 

 eral scutellar bristles, the posterior the longer; a slender elongate 

 decussate apical pair, a single one on median line so close to apical 

 pair as to be almost on apex of scutellum, just in front a widely sepa- 

 rated pair of same strength, and in middle a single discal one on 

 median line. There are thus two unpaired bristles on the median 

 line. I have never noted such disposition of scuteUar bristles in any 

 other form. Abdomen very bristly, no median bristles on fii-st seg- 

 ment, median discal and stronger median marginal pair on second 

 segment, a lateral discal and two lateral marginal on second segment, 

 median discal and lateral discal on third segment with marginal row 



