356 PERCY SLADEN TRUST EXPEDITION 
Abdomen. Ist segment orange: others with distal two-thirds darker or even 
brown-orange, the margins yellow, bristled all over, bristles longer on genital segment. 
Size, about 12 mm. ; wing, about 12 mm. 
Localities. Seychelles: Mahé, Cascade Estate, at or above 800 feet. Amirantes: 
Eagle Island, X. 1905. 
Apuaniosoma Becker, Mitt. Zool. Mus. Berlin, uu. (1903), Dipt. Aig., p. 186. 
See also Czerny and Strobl, Verh. Zool.-Bot. Ges. Wien, lix. (1909), p. 283. 
There are a few specimens of a small fly which appear more nearly placeable in this 
genus than elsewhere, though not agreeing entirely with the generic characters as given 
by Becker or as interpreted by Czerny. In both the species A. approximatum Beck. and 
A. quadrinotatum Beck. as noted by Czerny (l.c.) the front f. 0. b. are absent, and not 
present and crossed as in Chiromyia. The present insect agrees in that respect. But in 
the above two species (as also noted by Czerny) there are but two true o. b. placed rather 
far down the frons and a few more forward bristles much smaller in size. The present 
insect has a third upper o. b. between the normal two of the genus, and the succeeding 
row of 3 or 4 bristles not very small, though they are distinctly smaller and paler. 
Again, in both the above species the single d. c. are succeeded by a row of fair sized 
bristles with two well-marked moderate acr. rows between. The present species has 
the dorsum covered with rows of quite small bristles which give about 6 acr. rows. 
The facies, head structure and venation &c. agree well with the ordinary species; it is 
hence thought undesirable to erect a new genus on the above points. 
53. Aphaniosoma sexvittata, n. sp. (Fig. 38 and Plate 21, fig. 47). 
Head. Eyes bare, head hollowed behind: frons yellow, narrowing in front to about 
half the width just at back of frons: round each ocellus is a small reddish ring : the central 
area of the frons is very slightly depressed and is a little rufous in tone. The three f. o. 
mentioned above are followed by 3 or 4 progressively smaller bristles more nearly on the 
side of the eye. Div. o. v., conv. 1. v.; much conv. p. v. inserted just below vertex 
opposite each of the hind ocelli; oc. div., rather upright, inserted between ocelli: a pair of 
small bristles on ocellar area between hind pair; some 5 pairs of small bristles on frontal 
area, and a few overhanging forehead. Front view: 

pale 2nd antennal joints touching, 
face small, a deepish central pit: all pale yellow. Side view (Plate 21, fig. 47) :—2nd 
joint hidden in pit; 3rd rounded finely silky, yellow; arista darker on flagellum, quite 
bare. Convergent vibrisse, the large jowls with many stout bristles on side and below. 
Post-orb. row stout on upper hind orbits, especially behind v. b. Tongue and palpi yellow. 
Thorax. Orange with six appreciably darkened stripes, two from post-alar calli to 
humeri, practically vanishing about the cross suture; two starting from scutellum 
extending about three-fifths over thorax, one between each of above stripes, starting at 
back of thorax, and ending about the cross suture. The narrow line between mid-pair is 
pale yellow. The prothorax (where head touches) is darkened brown. The disc is 
covered with rows of small bristles. Pleurze pale yellow. Scutellum bare, rounded and 
arched, the disc rather darker, Last pair d. c. followed by smaller bristles in a row, the 
