DIPTERA. 383 
spot, and is shortened behind towards the first where it emits a slender 
branch to the hind border; a lurid transverse streak on the union 
of the bands; veins black, bordered with dark brown at the base; lower 
cross-vein oblique, rather long: halteres pale yellow. Length of the body 
34 lines ; of the wings 7 lines. 
S. America. 
TRYPETA ALBOVARIA, 
Nigra ; caput testaceum ; antenne fulve ; thorax cano trivittatus ; abdo- 
men fusiforme, purpureum ; pedes albidi, nigro varit, tarsis testaceis ; 
ale nigro-fusce, vitta fasciisque limpidis. 
Urophora? Desv. Dull black: head testaceous, whitish beneath and 
along the sides of the eyes; crown black with a testaceous disk; face 
yellow, with a pitchy spot on each side; epistoma rather prominent: mouth 
tawny, partly whitish ; palpi whitish: feelers tawny; third joint conical, 
much longer than the second; sixth feathered to the tip with rather long 
hairs: chest with three hoary stripes: breast with an oblique white stripe on 
each side eatending from the wing to the middle hip ; a white spot on each 
side by the fore-hip ; abdomen purple, spindle-shaped, much narrower but 
hardly longer than the chest; fore-legs black, with white hips ; posterior 
thighs white with black tips; shanks dingy white with black tips ; feet tes- 
taceous with black tips: wings blackish brown, interruptedly colourless 
along the hind border from the base to a little beyond the middle; a 
culourless stripe extending from the base along the disk to the middle, 
where it is united to two slightly oblique bands between it and the fore 
border ; two slightly oblique bands across the wing nearer the tip ; veins 
black ; lower cross-vein upright, very slightly waved. Length of the body 
4% lines; of the wings 11 lines. 
Senegal ? 
TRYPETA ARCUATA. 
Atra, gracilis ; caput argenteo varium; abdomen depressum, attenuatum ; 
ale nigro-fusce, antice subconvexa, vitta limpida fasciisque duabus 
albis, venis undulatis. 
Urophora ? Desv. Deep black, slender: head silvery-white about the 
peristoma and on the face at the base of the feelers ; epistoma not prominent : 
