Appendix. 
317 
Halteres dark brown. 
Length .—5 mm. 
Habitat .—Para (Durham). 
Observations .—Described from a single 9 brought back by 
Dr. Durham. It is much darker than the 9 of S. nitidus f and 
the relative positions of the cross-veins and bases of the fork- 
cells differ. 
Sabethes nitidus. n. sp. 
9 • Head with peacock blue and green scales with a row of 
thick short dark brown bristles projecting forwards over the 
eyes; palpi very short, brown, with a few spines at the apex; 
proboscis dark brown, rather swollen at the apex, minutely 
hairy; clypeus frosty grey ; basal joint of antennae frosty grey, 
remainder brown, densely pilose, but not much more so as in 
the 9 j joints much about the same length. 
Thorax black, with tiat peacock-blue and green scales, the 
back of the mesonotum and scutellum covered with large Hat 
metallic green and bronzy scales, a tuft of dark scales just in 
front of the root of the wing. Metanotum dark brown, almost 
black, with four deep-brown chaetae ; pleurae black, with a large 
patch of white scales. 
Abdomen with the basal segment metallic green, remainder 
brilliantly coloured with green, mauve, blue, white and yellow : 
the colouring varies in different lights; when viewed from above 
the abdomen is deep metallic blue with basal coppery bands ; 
when viewed laterally the abdomen is bright apple green, with 
basal mauve bands and white basal lateral spots and yellow 
venter ; now and then, as the sun strikes the scales, red and 
yellow colours appear; the apex of the abdomen is provided with 
dense brown bristles. 
Legs metallic blue and violet or rich purple ; coxae dark, 
with patches of white scales ; the legs are not provided with 
paddles ; last three mid tarsi white underneath ; ungues small, 
equal and simple. 
Wings clothed with similar formed scales to the $; fork- 
cells long, the first sub-marginal longer and narrower than the 
second posterior, its base a little the nearer the base of the 
wing, its stem less than half its length and shorter than the 
stem of the second posterior cell; mid cross-vein nearer the apex 
of the wing than the supernumerary and longer, posterior cross¬ 
vein level with and longer than the mid. 
Halteres dark brown. 
Length .—5 mm. 
£ . Head clothed with metallic green and blue scales; 
palpi and proboscis brown. Abdomen metallic blue with golden 
ventral and lateral patches, the patches being somewhat apical. 
