392 PERCY SLADEN TRUST EXPEDITION 
nearly reach the eye-margins, the overall breadth from eye to eye is nearly five times the 
depth of the face; if the mouth is viewed somewhat from below, the opening is seen to 
be excessively wide. Side view (Plate 21, fig. 43):—a long flattened oval, eyes much 
projecting backwards, and hiding the face in front; the jowls are not seen, being 
apparently bent in sideways; hind head visible below. The antennz have the second 
joint with three longish spines and a few small bristles; third joint irregular oval with 
elegant recurved hairs at the tip, arista bare and inserted rather close to second joint. 
On the lower angle of the facial mouth-margin is a long stout vibrissa, converging and 
pointing downwards; it is followed by four downward-pointing bristles just below the 
eyes; the hind head is bristly. Thorax: dorsum smooth and bare; cheetotaxy: two 
evident d.c. behind the suture, continued in front by about three much finer bristles, 
diverging to the humeral callus. The acr. bristles are represented by two or three 
longish bristles in a single line from the front of the thorax up to the cross suture: just 
in front are a few fine bristles on the front margin of the thorax. The hind notopleural 
is large, and above it is an evident pre-alar, between the line joining these and the humeral 
knob are many much smaller bristles, but it is scarcely possible to specify which is the 
second notopleural, &c. ; the humeri and below are covered with fine bristles. Scutellum 
with short divergent end pair, and behind these and little further apart is a much smaller 
sublateral pair; two small sternopleurals, and one above, are all that are very evident. 
The metanotum is much developed: when the insect’s thorax is viewed perpendicularly 
to its horizontal plane, the metanotum’s outline projects beyond the scutellar boundary. 
Venation as Fig. 34, rather like Ziomyza. No special leg characters. 
Type. The following species. 
48. Hchidnocephalus barbatus, n. sp. (Fig. 84 and Plate 20, fig. 40, Plate 21, 
figs. 41, 42, 43). 
Head. Structure as described and figured for the genus. Frons and vertex pale 
shining orange, darkened inside the ocelli, and somewhat darkened in a roughly U-shaped 
mark above the antennz: the mouth-margin 
(viewed from below) is darkened, especially 
on the front lip. 
Thorax. Orange on dorsum and 
on pleura down to a rather narrow line 
starting just below the humeri and extend- 

ing below the wing insertion to the 
abdomen ; this line is darker brown-orange: 
below this the thorax is all yellow. Wings 
slightly smoky, more intensely so between the costa and the long second vein: all the 
veins brown. Halters with long brownish knobs and lighter stalks. Legs all yellow: 
front femora with row of four or five long bristles on top and about five behind on 
the distal half; small terminal spine on the mid-tibia ; distinct preapical spine on the 
hind femur. 
Fig 
s: 
34. Echidnocephalus barbatus, n. sp. x 30. 
