308 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 51. 



EPIDEXIOPSIS, new genus. 



Genotype. — Epidexiopsis orhitalis, new species. 



Differs from Epidexia as follows: Male. Vertex nearly one-third 

 head-width, front of equal width, face widening gently from same. 

 Frontalia narrower than one parafrontal. Cheeks narrower, the 

 eyes descending nearly or quite as low as vibrissae. Two proclinate 

 orbitals, two reclinate orbitals, frontals less developed posteriorly; 

 parafrontals of nearly equal width. Palpi longer. Three stemo- 

 pleurals, the middle one weak. Apical pair of scutellars quite 

 strong, longer than discal pair. Marginal macrochaetae of abdomen 

 not so long, the discal rather stronger than in Epidexia, all erect; 

 the discal shorter than marginal except that this is reversed on anal 

 segment. Tarsi shorter, delicate; claws very short. Apical cell 

 closed in margin, ending nearer to wing-tip; hind cross vein not 

 straight, almost in middle between small cross veui and cubitus. 

 Small cross vein nearly opposite tip of auxiliary vein. 



EPIDEXIOPSIS ORBITALIS. new species. 



Length of body, 4.75 mm.; of wing, 3.5 mm. One male, Miami, 

 Florida, October 28, 1908 (Townsend). TD 562. 



Black, palpi pale yellowish, second antennal joint rufous at tip. 

 Head silvery, the occiput ashy. Thorax and scutellum thinly silvery ; 

 two linear inner vittae, the outer ones of the semicolon type. Viewed 

 from behind the postsutural mesoscutum appears black except the 

 lateral margins and irregular broad hind border. Abdomen shining, 

 the last three segments silvery-white poUinose on base, the silvery 

 fasciae successively broadening slightly from second to anal segments. 

 Hypopygium blackish. Femora and tibiae brownish. Wings clear. 

 Tegulae white. 



Eolotype.—l^o. 20034, U.S.N.M. 



MIAMIMYIA, new genus. 



Genotype. — Miamimyia cincta, new species. 



Differs from Houghia as follows: Male. Face hardly perceptibly 

 widened from front, the vertex hardly one-third of head-width. Face 

 much longer, the antennae set much higher. Frontalia much wider 

 than one parafrontal. Three or four short but strong closely set pro- 

 chnate orbitals on each side. Arista shorter than third antennal 

 joint, porrect. Second antennal joint very short; the third six or 

 seven times as long as second, much developed, reaching oral margin. 

 Facial plate more than twice as long as wide, equal in width above 

 and below. Facialia thickly ciHate more than halfway up. Palpi 

 rather slender. Parafacials very narrow and elongate. Cheeks 

 wider, the eyes not quite reaching the level of vibrissae below. Two 



