362 PERCY SLADEN TRUST EXPEDITION 
from the tip of the ocellar triangle. The head bristles are long. There are two pairs 
lower f. o., the first just above the lunular level the other behind, the first pair is crossed 
half-way, the other at tip: between them and down to forehead are several small bristles. 
Right down on tips of lunular arch (at side of base of Ist antennal joint) is another pair of 
orbital bristles bent backwards. The two pairs of upper f. o. are roughly parallel to axis 
of head, the first forwardly, the second backwardly bent, inserted rather close with a fine 
bristle between. The mid area of frons (between the pitted lines mentioned above) has 
some few longish thin bristle-pairs, two pairs about one-third way down are bent back 
and are more conspicuous. I. v. nearly parallel, o. v. div., between is a third extra some- 
what smaller bristle; true p. v. well on hind head, slightly div., between and a little 
above is asomewhat smaller div. pair; oc. inserted between ocelli on the small ocellar area, 
rather upright, slightly div.; between hind ocelli is another smaller div. pair. Front 
view :—forehead below lunule dark chestnut, face black with greyish pollen, narrowest 
midway from forehead to mouth edge at point where vibrissal row starts ; it is furrowed ; 
antennze touching at base. Side view (Plate 21, fig. 54) :—antennee black, 2nd joint with 
3 bristles, top one longest ; 3rd joint with orange silky pubescence ; arista brownish, lower 
joints thickest, flagellum diminishing slowly in diameter from them, finely pubescent. Main 
pair of vibrissee crossed, the 7 or so following ones stout, straight. Mouth strongly bristled 
below. Small regular post-orb. row ; well-marked nick at hind head as figured. 
Thorax. Black with sparse ochreous pollen. The dorsum is very bristly, some of 
the general bristles being nearly as stout as the macrochetes. One can readily distinguish 
three dorso-central pairs behind the suture which are very long: there is also a fourth 
bristle almost in the line of these before the suture: this bristle, with the humeral and 
side presuturals form an evident cross line of larger bristles from one humerus to the 
other: this row is partaken in by certain of the general bristles which lie in its direction 
and are larger than the rest. This is a distinct, though smaller, prescutellar pair, which 
form another evident cross row with the last pair of dorso-centrals, an extra bristle each 
side between the prescutellar and the dorso-centrals, and the bristles over the wing bases. _ 
Pleurze bare between humerus and cross suture, with a stout bristle just behind and below 
the humeral bristle; three stout sternopleural bristles. Scutellum rounded in profile 
and section, with two basal and two 
> _| terminal bristles, apparently crossed (only 
SS one is present). Wings, as Fig. 42 : glassy 
with brown veins; costal slit present as 
ya usual with two short stout spines: costa 
black bristled and bordered to just beyond 
2nd vein, the thickening going to the 4th 
vein. Halters black. Legs black, the tarsi 
—— slightly paler in parts, especially the front 


Fig. 42. Hecoptomma solitariwm, n. sp. x 30, Ist tarsal joint. The front femora with 
abundant stout hairs on hind side 
for about the distal half. The other femora with downwardly pointing long bristly 
hairs. 
