Genus Stethomyia. 63 
long: and thin, black, unbanded. Wings unspotted, rather 
densely scaled, with brown scales. 
@. Head black, with a small median anterior patch of flat 
white scales projecting forwards, sides of the head with a grey 
sheen, and also a narrow grey line around the eyes; numerous 
black bristles and very narrow black upright forked scales 
behind and on the occiput; traces of a few small brown flat 
scales in the middle line; clypeus black. Proboscis black, 
covered with small black and bronzy scales and with small 
black bristles ; palpi a little longer than the proboscis, very thin, 
like those of A. bifurcatus, deep brown, four-jointed, basal joint 
rather swollen, apical joint about the same length as the second 
joint, slightly swollen, and a little more than half the length of 

iFig. 38. 
Stethomyia nimba. Nn. sp. 
I, Thorax (a, mammillated prothoracic lobe) ; II, prothoracic lobe ; IIT, (a) fore and 
(b) hind ungues of ? ; IV, 9 palpi and proboscis (greatly enlarged). 
the penultimate joint ; scales deep brown ; at the junction of the 
joints, the palpi are rather paler; a few black bristles at the 
apex, which is sometimes apparently constricted ;, antennae 
brown, basal joint black, verticillate hairs black. Mesonotum 
black, nude, with a silvery-grey median line and a silvery-grey 
band on each side, and numerous black bristles; prothoracic 
lobes black, with a dull-grey sheen and a mammilliform process, 
