48 PROCEEDINGS OF THE ACADEMY OF [Part I 



appendage a rather stout, almost straight, flattened hook with the 

 tip sHghtly curved; ventral pleural appendage an oval flattened 

 lobe, the inner face produced proximad into a flattened glabrous 

 lobe, the tip with a few delicate setae. Gonapophyses appearing 

 as broad flattened plates with the outer proximal angle narrowed 

 into a point. Ovipositor with the valves very short, the tergal 

 valves slender, acicular, strongly curved; sternal valves compressed, 

 the tips subacute. 



Habitat. — Peru. 



Holotype, d", Napo River, June 12, 1920 (H. S. Parish). 



Allotopotype, 9 , June 16, 1920. 



Paratopotypes, 6 cf's, June 12-14, 1920; paratype, 9, Yuri- 

 maguas, March 31, 1920 (H. S. Parish). 



Dicranomyia capnora is a striking species that finds its closest 

 relative in D. lutzi Alexander (British Guiana) from which it differs 

 in the details of coloration of the body, wings and legs. 



Dicranomyia optabilis sp. n. 



Antennae dark brown ; head yellowish gray ; mesonotal prae- 

 scutum reddish with a broad black median stripe; postnotum, scutel- 

 lum and lobes of the scutum dark brown; pleura yellow and dark 

 brown; halteres yellow; fore coxae dark brown; hind coxae yellow; 

 femora brownish yellow with a very broad black subterminal ring; 

 wings yellowish, the basal quarter and a conspicuous seam along 

 the cord brownish; vein Sc long; abdominal segments dark brown, 

 the distal half of each segment yellowish. 



Female. — Length 6.6 mm.; wing 7.5 mm. 



Rostrum and palpi dark brown. Antennae dark brown, the 

 flagellar segments cylindrical, each with a short pedicel. Head 

 dark, yellowish gray pruinose. Mesonotal praescutum shiny red- 

 dish castaneous with a broad black median stripe; lateral stripes 

 short, confluent with the posterior ends of the median stripe; a 

 large circular brown spot on the posterior margin of the sclerite; 

 scutal lobes shiny brownish black, the median area paler; post- 

 notum and the median area of the scutellum black, the lateral por- 

 tions pale. Pleura with the propleura, mesosternum, mesepisternum 

 and the lateral sclerites of the postnotum shiny dark brown; re- 

 mainder of the pleura yellowish. Halteres yellow, the outer por- 

 tion of the stem a little darkened. Legs with the fore coxae dark 

 brown; middle coxae slightly infuscated, hind coxae yellowish; tro- 

 chanters obscure yellow; femora brownish yellow, before the tips 

 passing into a broad black subterminal ring, the extreme apices 

 very narrowly obscure yellow; remainder of the legs black, the 

 bases of the tibiae a little paler. Wings with a yellowish tinge, 

 variegated with brown; stigma ova), dark brown; a broad basal 

 crossband, slightly paler brown than the stigma, occupies more 

 than the basal quarter of the wing; a broad brown seam along the 



