Appendix . 351 
longer and slightly narrower than the second posterior, its base 
much nearer the base of the wing than that of the second 
posterior, its stem about one-third the length of the cell; stem 
of the second posterior rather more than two-thirds the length 
of the cell; supernumerary and mid cross-veins united at an 
obtuse angle; posterior cross-vein not quite its own length 
behind the mid. 
Halteres mostly black, basal part of stem yellow. 
Length. —3 to 3*5 mm. 
Habitat .—Para, Brazil (Dr. Durham). 
Observations. —Described from a series caught by Dr. Durham. 
It is a most beautiful species with brilliant thorax, the three 
golden marks on the mesonotum looking like the upper part of a 
cross. Females only have been received. They seem to be 
intermediate between Sabethes and Trichoprosopon, but clearly 
come in the same section as the latter owing to the metathoracic 
scales, but they differ from T. nivipes in that the venation is of 
Oulex type. 
NOTES ON LARVAE AND PUPAE. 
The larva and pupa of Meg’arhinus. 
Two fresh specimens of a Megarhinus larva have been sent 
from Grenada by Dr. N. S. Durrant, and also three dried larval 
and two pupal skins. The larva is chiefly peculiar in that there 
are no prominent anal flaps. The larvae when mature reach 
1G to 18 mm. in length; the head is large and of a bright 
chestnut-brown, it can apparently be completely rotated, and 
in the two specimens sent in spirit is peculiarly tucked in 
above the body; the antennae are pale brown, cylindrical and 
narrow with a single lateral and a few apical bristles; the 
mandibles are multiserrated, almost black; the metastoma or 
under lip is dark brown and smooth edged, on the venter of 
the head is a median sulcus and a dark chitinous ring at the 
nape ; dorsally the head is smooth, contracted laterally towards 
the front, where it is bluntly truncated; the brushes arise from 
prominent chitinous projections; the brushes are dark brown, 
the basal projections testaceous, each brush is composed of a few 
thin lamellae, which lie close together and look like two brown 
curved horns when viewed with a lens. The basal lobes of the 
antennae are large, the antenna arise from a small grey area 
and .are narrow and cylindrical. 
