318 PERCY SLADEN TRUST EXPEDITION 
half-way ; the two upper f. 0. pairs are sub-parallel and bent backward. V. b. on distinct 
pits, the i. v. very long, sub-parallel and bent a little backward, inserted just behind upper 
eye angle, the o. v. long and div., inserted in a line with post-orb. row, a little remote 
from eye: the latter row is seen to be stout and consists of bristles alternately longer 
and shorter. Well below on back of head is a smaller bristle forming a triangle 
with the v. b.; the p. v. are shortish, stout, and well below vertex, they diverge. The 
oc. are stout, div. and are inserted one each side of the front ocellus. There are small 
scattered bristles on the frons. The lunular arch is demarcated from the frons by a 
red shallow suture. Front view (Plate 19, fig. 7):—much as last species, but the 
central ‘“‘keel” is merely a broader triangular swelling merging below with the lip. 
Side view (Plate 19, fig. 8):—the pale orange antennz have the second joint bristled 
inside, bare outside, with marginal bristle row there and below, a long spine on base at 
tip; third joint parallel-sided; the arista quite bare under a high power. The 
jowls are pale orange, hairy and bristly below with a long stout spime just 
behind lowest point of eye. The head immediately behind eyes is bare, but bristly 
behind. Palpi orange, flattened, bristly below. The tongue is retracted in the 
specimen. 

Fig. 11. <Acidia (?) ocellata, n. sp. x 13. 
Note. The specimen has an extra f. o. b. on the left side in front of the normal 
front bristle. 
Thorax. Orange, and covered with very many irregularly arranged dorsal bristles ; 
the pleuree, &c. yellow. A pair of d. ¢. further behind than last species, large prescut., 
very strong h., n. p., presut. low down, three strong alar (two on edge of disc, one in 
line with prescut.). Scutellum with strong basal bristles near angle, the terminal pair is 
broken off, metanotum yellow-orange. There is a strong st. pl. br. 
Wings, Fig. 11. The striking feature about the wings, as seen without a lens, is 
the two large blackish ocelli occupying a large part of the wing, and bordered almost all 
round by a whitish border ; the rest of the wing is suffused with honey coloured pigment, 
which borders the costa and forms a rough V-shaped mark behind the black spot. 
Under the microscope the costa is seen to be very bristly; a strong spur occurs at 
the breach by the auxiliary branch; the Ist vein is stoutly bristled, as is the third 
from its junction with the second to a point about 2 the distance between the 
cross vein and the end. ‘The anal cell is well poimted. The small calypters are 
beautifully bordered with dark margins and silky hairs. The whole hind wing-margin 
