354 PERCY SLADEN TRUST EXPEDITION 
Head. Top view :—yellow, dull except for a small triangular projection in front, 
and a narrow edge surrounding the red ocellar area, and the extreme edges of the eye- 
margins; these are rather shining. The basal ocelli nearer than distance from front to basal. 
Conv. front f. 0. pair, two backwardly pointing hind f. o. pairs (in one specimen the former 
are missing: in another there are 3 hind f. o. on one side). Between the 3 f. 0. pairs 
are a few very minute bristles. The surface of the frons has also a few small scattered 
bristles. I. v. conyv., almost in line with the f o., o. v. div. ‘Tiny crossed p. v. below 
vertex. Much div. oc. inserted between ocelli. There are about 4 small evident bristles 
behind the v. b.: these are possibly the last bristles of the post-orb. row, but the true 
p. 0. row 1s somewhat separated from this group and its bristles are much smaller than the 
above 4 and are directed sideways and not upward. Front view :—the yellow antennz are 
closely touching and half le in a deep pit in the white face. The orange palpi are best 
seen in this view: the eyes are nearest just below base of antennze. Side view (Plate 21, 
fig. 44):—the eyes are somewhat oval (though nothing like C. minima, Beck.), the long 
axis being about 30° to the horizontal head axis. Jowls broad (see fig.) all covered with 
palish hairs. Crossed vibrissal pair followed by another nearly as stout and a few similar 
ones behind them. The black flagellum of the pale yellow antennz is very conspicuous. 
Thorax. The dorsum is orange and is covered with small black bristles, the 
humeri pale yellow as is the area behind them and all the pleura. The last d. c. pair is 
large and fairly close to back of thorax, it is followed by a distinct row of bristles, the first 
2 or 8 being longer than the others and diminishing to the size of the ordinary discal 
bristles, which form 6 scattered and irregular rows of acr. b. Humeri with a large hind 
and small front b.; usual 2 n. p., a presut., the alar bristles are not very distinguishable 
from the dorsal bristling. There is a distinct mesopl. and a sternopl. bristle. The yellow 
scutellum is bare with a pair of approximated terminal bristles and two smaller side ones: 
the top is somewhat flattened. Wings, 
i Fig. 35, normal, glassy with pale yellow 
veins. Halters with conspicuous pale 
yellow knob. The legs are all yellow with 
i flattened femora and black claws. 
Abdomen. Orange, with small dark 
bristles. The last segment is knobbed 
with longer bristles and two small dark 
Fig. 35. Chiromyia dubia, n. sp. x 40. ; 
side spots. 
¢ Two perfect and two headless specimens are possibly the males of the above. In 
any case they cannot be separated without much more material. 
The head characters are almost the same as above, but the bristles are rather 
stronger. The thorax is also the same, but again the bristles are stronger ; the bristle in 
front of the d. c. is stronger, and there is a very strong prescut. pair, which is quite absent 
from the above. 
The abdomen is dark brown with narrow pale margins. 
Size, over 1? mm. ; wing, over 1? mm. 
Locality. Seychelles. Mahé: Cascade Estate, 800 feet or over, 1908—9. 
