Genus Rachisoura. 
209 
creamy-white scales and a few black and pale chaetae; pro- 
thoracic lobes prominent, clothed with flat creamy scales and a 
few dusky ones; there are 
also flat scales over the lobes, 
the lowest dark, the highest 
pale. 
Abdomen entirely jet 
black, with violet reflections, 
the segments with apical 
creamy lateral triangular 
& spots, the base of the triangles 
posterior ; venter creamy ; 
border-bristles pale, apex with 
long black dense chaetae. 
Legs black, unhanded ; 
coxae and trochanters ochre- 
ous, with pale flat scales; 
some white scales also just 
at the base of the under side 
of femora; spines black ; ungues equal and simple, hind pair 
small. 
Wings with broad brown dense scales, particularly at the 
apex ; first fork-cell longer and narrower than the second fork¬ 
cell, their bases about level; stem of the first about half the 
Fig. 81. 
Rachisoura sylvestris . 9. n. sp. 
Apex of abdomen. 
Fig. .82. 
Rachisoura sylvestris . 9. n. sp. 
length of the cell, of the second not quite so long as the cell; 
posterior cross-vein longer than the mid, about twice its own 
length distant from it. Halteres with pale stem and fuscous knob. 
Length. —5 to 5 • 5 mm. 
$. Head, thorax and abdomen as in the 9 ; palpi brown,, 
not quite two-thirds the length of the proboscis, acuminate, thin, 
VOL. v. 
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