356 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.43. 



length, crooked, practically bare with only faint indication of a 

 microscopic pubescence, somewhat enlarged on basal one-fifth, thence 

 tapering, basal joints short. Facial plate above vibrissas broad-oval, 

 lightly carinate, the vibrissa! angles narrowing its lower portion and 

 situated about as far above oral margin as length of second antennal 

 joint. Vibrissse twice as long as the peristomal bristles below them. 

 Facialia bowed, bare save for a very few bristles next vibrissae. Oral 

 margin not prominent, cut off, the whole facial plate nearly vertical 

 in profile. Proboscis short, but horn}'' rather than fleshy, part below 

 geniculation distinctly less than cheek- width. Palpi well developed, 

 about as long as antennae, hardly thickened apically. 



Three sternopleural and four postsutural bristles. Scutellum with 

 two long pairs of lateral bristles, a very slender apical decussate pair 

 about half as long, and a discal pair of about same length as latter. 

 First two abdominal segments with only a lateral marginal macro- 

 chseta, third segment with a marginal row of about 10 rather long 

 bristles, anal with discal and marginal rather shorter ones. Legs long, 

 with stout macrochaetae on the tibiae; claws and pulvilli very long and 

 strong. Wings without costal spine. Apical cell open well before wing- 

 tip. Apical crossvein hardly bowed in, fourth vein continued in 

 extremely short stump directed toward inner margin of wing and 

 without wrinkle, hind crossvein gently sinuate and nearer to apical 

 than to small crossvein. 



Reproductive habit unknown, but judging from the head and wing 

 characters it should be larviposition after the manner of Dexiids. 



Type-species. — (Estropsis viridis, new species. 



CESTROPSIS VIRIDIS, new species. 



Length of body, 11.5 mm.; of wing, 10 mm. One male, Tam- 

 boraque, on the western slope of the Cordillera Occidental, valley of 

 the Rio Rimac, Peru, about 9,000 feet, April 3, 1910, on flowers of 

 Cyclanihera, sp. 



Front, face and cheeks blackish, thickly covered with a changeable 

 satin-like yellowish-silvery pollen , even the broad fi'ontalia so covered, 

 but the facial plate and facialia not pollinose. Occiput shining 

 metallic greenish-purple, thinly dusted with silver}^ which does not 

 obscure its ground color, considerably invading the cheek-area. 

 First two joints of antennae reddish-yellow, third joint and arista dark 

 brown. Facialia and sides of facial plate brownish-yellowish, the 

 carina and epistoma blackish. Palpi pale brownish-yellow, little 

 darker apically. Pleurae and mesoscutum metalhc greenish-purple 

 like the occiput, thinly silvery, appearing thickly so in some lights, 

 four heavy velvet-black vittae, the outer ones subinterrupted and 

 wider. Scutellum metalhc green, j^urplish on disk and base. Abdo- 

 men metaUic bright green; the hind borders of first three segments 



