NEW MUSCOID FLIES FROM THE ANDEAN MONTANYA 15 



shining black, wath silvery pollen showing distinctly to faintly on second 

 and third segments according to lights, anal segment showing practically 

 none and first segment only below, hind borders of second and third seg- 

 ments with little. Legs black, front femora silvery on outside. Wings 

 clear, slightly smoky on costal portion. Tegulae white, faintly smoky- 

 yellowish on border. 



Type, TD4072 (fly and dissection of uterus). 



The abdomen of type was slit and part of uterus extracted. The 

 uterus is subtubular, not strap-like, and the elongate macrotype eggs are 

 irregularly arranged therein as in the Paraplagiina, to which subtribe the 

 genus probably belongs. The eggs show development of embryo, but 

 the cephalophar5Tigeal skeleton of the maggot is undeveloped. 



Tribe GYMNOCHAETINl 



Gymnochaetopsis, new genus. 



Approaching Eug^mnochaeta in externa! characters, the habitus of 

 head very similar ; the resemblance especially in antennae, facial charac- 

 ters, and thickly-hairy eyes most striking. Eug^mnochaeta male lacks 

 the outer vertical bristles, the male front at vertex is more narrowed than 

 in the present genus, the female front is a little narrower, the frontal 

 bristles extend a little lower, the cheeks are not quite so broad, and the 

 palpi are well developed, bowed and well thickened on apiceJ half ; 

 while there is no stump at bend of fourth vein, there are only three lat- 

 eral pairs of scutellar bristles, the apical decussate scutellar pair is not so 

 elongate, and the median disceJ abdominal macrochaetae are stronger. 

 Otherwise Eugymnochaeta is externally closely similar to the present 

 genus, except that the latter has no metallic green coloration whatever. 



Front of female at vertex about equal to width of one eye, from vertex 

 the front and face evenly widening to lower comer of eyes where the 

 facial width is at least twice as great as that of vertex ; front of male at 

 vertex about four-fifths the width of one eye, remaining same width on 

 posterior one-third and then evenly widening. Inner and outer vertical 

 bristles present in both sexes, the inner longer and strongly decussate. A 

 pair of proclinate ocellar bristles. Only one pair of inner orbital bristles 

 in male in line with frontals, but in femeJe the next pair of bristles is recli- 

 nate unlike the remaining fronted bristles. Female with two proclinate 

 outer orbital bristles, male with none. Frontal bristles descending not 

 quite to end of second antennal joint. Parafacials bare, but little wider 



