286 Professor "Williston cm tlie 



the root of the wings. Metaiiotum brown, yellowish on the sides. 

 Abdomen dark brown, the forceps reddish. Halteres with a 

 l»rown knob. Legs brown, the base of the femora yellowish. 

 Wings nearly nniforraly clouded with blackish, the stigma darker ; 

 termination of the auxiliary vein nearly opposite the proximal 

 end of the submarginal cell. 



One specioien. 1000 feet. In this specimen the 

 anterior cross-veiu is sit-uated nearly opposite the middle 

 of the dis.-al cell. 



2. Rliijyidia un'rpedinata, n. sp. (PL IX., fig. 55, antenna.) 



$ . Brown spots along the anterior border of the wing; autenmo 

 long-unipoctiuate ; halteres brown ; thorax with a brown stripe and 

 a lateral brown spot. Length 5 mm. 



Rostrum, palpi and antennoe black. Flagellum of antennaj, 



except the terminal joints, unipectinate, the pectinations beginning 



Tvith the first joint and increasing in length to the seventh. Thorax 



^'ellow ; the dorsum with a median brown stripe, and, on 



■either side behind, a rounded yellow spot, leaving a yellow space 



between them ; these brown spots are continued on the scutellum, 



enclosing a small yellow spot. Plenraj with a slender, longitudinal 



forown stripe. Halteres brown. Metanotum brown. Abdomen, 



brown, the venter yellowish. Legs brown, the femora lighter 



coloured toward the base ; second, third, and fourth joints of the 



hmd tarsi light yellowish. Wings with a blackish tinge, with 



inconspicuous darker clouds along the anterior margin and on the 



cross-veins ; bafore and beyond the dark-brown stigma, a rounded, 



more hyaline spot ; apical portion of the costa more distinctly 



clouded ; insertion of the auxiliary vein a little beyond the middle 



of the prefurca. 



One specimen. 1000 feet. 



o. Rhi'pldia costalis, n. sp. (PI. IX., fig. 56, antenna.) 



$. Antennae bipectinate ; thorax not striped; costa with 

 brown spots or clouds. Length 5 mm. 



Palpi, rostrum and antennae black, the latter bipectinate, but 

 the pectinations shorter and more slender than in B. hipectlnato. 

 Thorax brownish-yellow, the mesonotum opaque yellowish-red, 

 with a spot in front, and two behind the suture, faintly brownish. 

 Knob of halteres brownish. Abdomen reddish, with brown 

 posterior borders to the segments ; forceps red. Legs browu ; the 



