LAMB—DIPTERA: HETERONEURIDA, ORTALIDA, TRYPETIDA, SEPSIDA, ETC. 321 
true (a) front f. o., upright and conv. to centre; in front (above a black side spot on 
the face) is an auxiliary bristle (type 8). Two very slightly div. and backward bent 
hind f. 0. : the distal one is practically of type a and is inserted inside the proximal front 
f. o. so that the distal hind f. 0. and proximal front f. 0. are nearly in the same transverse 
line: the proximal pair of hind f. 0. is of type 8. I. v. of type a, very long, upright though 
slight conv. and bent back, inserted close to eye and absolutely on the vertical ridge. 
What represent the outer v. are of type 6 and are a little down the eye orbit pointing 
back and separated from the stout post-orb. row (of type 8) by a few tiny black 
bristles. P. v. of type 8, below vertex, almost touching at tip, bent up. Between 
each of these and the o. v. is another bristle of type 8. Oc. very long, of type B 
though more pointed, straight, div., inserted practically in a line with front ocellus 
but with bases a little further from it than hind ocelli are from one another: the oc. 
are so long that they cross the hind f. 0. at the ends. On the frons about 3 down 
from front ocellus is a parallel pair of type 8 projecting over the forehead. Apart 
from the macrochetes the frons is bare. Front view:—face very gently arched, 
the eyes approach nearest about 3 down from antennal base to mouth margin. 
Antenne touch at base and in this view the 2nd joint is seen to have a small internal 
finely bristled flap over the base of 3rd. The mouth margin is much curved in outline 
with the upper lip just projecting bluntly from the curve: face all yellow except the 
side margins of mouth which are brown lined. In this view the black spots between 

Fig. 13. ARhabdocheta spinosa, n. sp. x 25. 
the eyes and antennal bases on each side below f. 0. are well seen, as are the blackened 
compressed bristly palpi. Side view (Plate 19, fig. 10) :—the triangular yellow projection 
of frons, with the above mentioned spot, is very prominent: the profile is concave 
and the projection of the lip well seen. At lower angle of jowl is a bristle of type B 
followed by a pointed one of type a. The jowls are yellow merging into the blackened 
back of head, the lower part of latter with pale bristles. The antennee are orange, 
2nd joint a little greyer: below, the 2nd joint has a fringe of pale marginal bristles 
but is practically bare on the outside (see however above, front view); 3rd joint very 
long, roughly pyramidal with pointed tip, pubescent and darkened at tip: arista with 
orange basal joints and paler flagellum: it is closely covered with moderately long pale 
hairs. Palpi as above, tongue orange, hairy at tip. 
