1921] NATURAL SCIENCES OF PHILADELPHIA. 43 



Habitat. — Peru. 



Holotype, d", Iquitos, May 6, 1920 (H. S. Parish). 

 Allotopotype, 9 . 



Paratopotype, 2 9 's, May 6-25, 1920; paratypcs, 8 cf^ 9 , Yuri- 

 maguas, April 6-22, 1920 (H. S. Parish). 



Geranomyia xanthoplaca sp. n. 



Head dusky black; a narrow yellowish gray stripe extending 

 from the front to the occiput; flagellar segments with long verticils; 

 mesonotal praescutum orange-rufus, the lateral margins narrowly 

 greenish; femora pale brown, the tips broadly pale yellow; a broad 

 subterminal dark brown ring; wings faintly yellow; five conspicuous 

 brown spots along the costal region, the third covering the origin 

 of Rs and the tip of Sc, the latter short, extending but a short dis- 

 tance beyond the origin of Rs. 



Male. — Length (excluding rostrum) about 4.8 mm.; wing 6 mm.; 

 rostrum alone about 2.8 mm. 



Female. — Length (excluding rostrum) about 4.6 mm.; wing 5.5 

 mm.; rostrum alone about 2.7-2.8 mm. 



Rostrum black, comparatively short but slender. Antennae with 

 the scapal segments black, the flagellum paler, dark brown; flagellar 

 segments cylindrical or elongate-oval with long verticils in both 

 sexes. ' Head with a conspicuous yello^\'ish gray stripe extending 

 from the front to the occiput, subequal in width to the space between 

 the eyes at their narrowest point; remainder of the vertex and occi- 

 put dusky black. Mesonotal praescutum intense orange-rufous, 

 without apparent darker stripes, the lateral margin narrowly green- 

 ish, the sublateral regions paler than the median stripe; remainder 

 of the mesonotum yellowish testaceous, the posterior half of the 

 postnotum darkened. In the female the scutal lobes are slightly 

 darkened. Pleura yellow with greenish tints. Halteres pale, the 

 knobs greenish brown. Legs with the coxae and trochanters green- 

 ish testaceous; femora pale brown, paler basally, the tips broadly 

 (0.65 mm.) pale yellow; a broad subterminal dark brown annulus, 

 this about equal in extent to the pale tip; the femora basad of this 

 brown ring are narrowly and indistinctly yellowish ; tibiae and tarsi 

 greenish brown, the tips of the tibiae and distal tarsal segments 

 darker; third and fourth tarsal segments with a series of fine comb- 

 like bristles; claws with the basal shoulder indistinctly toothed. 

 Wings with a faint yellowish tinge, the costal and subcostal cells 

 brighter yellow; five conspicuous brown spots along the costal mar- 

 gin, arranged as follows: at arculus; at the supernumerary cross- 

 vein in cell Sc; the third at the origin of Rs and tip of Sc2; the fourth 

 at the stigma, large and elongate; the last mark at the tip of Ro+z] 

 large gray clouds at the ends of the anal veins; comparatively nar- 

 row gray seams along the cord and outer end of cell 1st M-^; veins 

 yellow, brown in the infuscated areas. Venation: >Sc short, Sci 



