ADAMS : DIPTERA AFRICANA. 197 



lar, the lower one larger and diamond-shaped ; face, cheeks and 

 occiput light yellow, latter reddish yellow above, with a brown- 

 ish triangular marking on each side above the neck ; mouth- 

 parts and clypeus yellow ; antennse about as long as the face, 

 reddish yellow, apex of third joint black, arista rather short 

 and thick. Thorax yellow, mesonotum with three broad, red- 

 dish-yellow vitttie, the two lateral ones abbreviated anteriorly, 

 the central one posteriorly, a few black, bristly hairs in front 

 of and above base of wing; scutellura reddish yellow on disk, 

 besides an apical pair there are two small bristles on each side ; 

 pleurse with a small shining black spot above front coxte ; hal- 

 teres yellow. Abdomen reddish yellow throughout. Legs yel- 

 low, last two joints of all tarsi black. Wings hyaline, veins 

 brown, second and third sections of costa somewhat swollen, 

 former three-fourths as long as the latter. Length, 2.5 mm. 

 One specimen ; October. 



AGROMYZID^. 



Rhodesiella, gen. nov. 



Head hemispherical ; eyes oval, bare, occupying whole of 

 height of head ; cheeks very narrow ; front a little broader than 

 one eye, with three rows of short bristles on each side ; face 

 nearly perpendicular, slightly concave, with the oral margin 

 moderately projecting, vibrissae present ; antennae short, third 

 joint orbicular, arista distinctly pubescent ; proboscis short and 

 fleshy, clypeus projecting, palpi clavate. Mesonotum minutely 

 punctulate, with macrochiTetne only on the sides ; scutellum 

 large, swollen, subtriangular, more distinctly punctate, spinous 

 tubercles on sides near apex, with an apical pair of divergent 

 bristles. Abdomen short and broad, composed of five segments. 

 Costa reaches tip of fourth vein ; auxiliary vein rudimentary, 

 joining the first vein near its center ; first vein ending a little 

 before the middle of the wing, second, third and fourth veins 

 curving forward, the latter ending before apex of wing, second 

 and fourth sections of costa of about equal length, third nearly 

 as long as both together ; hind cross-vein beyond middle of 

 wing ; discal and second basal cells united, anal cell rudimen- 

 tary. Femora with an external row of short bristles. Type, 

 the following species. 



