LAMB—DIPTERA: HETERONEURIDA, ORTALIDA, TRYPETIDA, SEPSIDA, ETC. 363 
Abdomen (Plate 21, fig. 55). Silvery except for the Ist segment and the central 
area and middle of the base of the second segment. The sides are much bent under and 
the silvery shine is carried over the edges on the lower half of second segment and all the 
others: the first segment is swollen at the upper corners and is there covered with black 
hairs on its outer edge: it is pointed in the centre as usual and is all very shiny black. 
The second segment bears a tuft of black hairs at each of its upper corners: its dorsum 
has small bristly black hairs, some of which form two moderately regular lines parallel to 
the posterior edge: the 3rd and 4th segments have two similar rows: the last segment 
has the usual long bordering bristles. The relative sizes will be seen from Fig. 55. 
Size, 31 mm. ; wing, 22 mm. 
Locality. Seychelles. Mahé: Cascade Estate, at or above 800 feet, 1908—9. 
DesmomeEtopa Loéw, Berlin. Ent. Zeitschr., ix. (1865), 185, vi. Cent. 
59. Desmometopa M-mgrum Zett., Dipt. Scand., vil. 2743, 10. 
Five specimens are in no way distinguishable from forms of this species. 
Localities. Seychelles. Mahé: near Morne Blanc; Cascade Estate, at or above 
800 feet ; marshes on coastal plain, Anse aux Pins and Anse Royale. 
60. Desmometopa inauratum, n. sp. (Fig. 43 and Plate 21, fig. 56). 
This species is very near to D. M-ngrum in most of its characters, including the 
scheme of frontal marks, but the thorax is covered (in good specimens) with a very dense 
golden pollination, and the jowls are less deep. 
Head. Top view:—the frons is deep dullish black down to the antennze except 
that there is a large equilateral sharp-pointed ocellar triangle, the upper eye-margins 
joined to this triangle, and two narrow parallel stripes on the frons (carrying the usual 
two rows of mid-frontal bristles) which are all bright grey: a very distinct black M 
is thus formed on the frons. Lower two pairs f. o. slightly conv., with fine bristles 
between, and a rather larger small bristle on extreme front of eye-stripes. Two pairs much 
overhanging hind o. b., small bristles between them, and a rather large upright small 
bristle between last and the i. v. I. v. bent a little back and a little conv., o. v. bent 
much out; p. v. on vertex just outside and behind hind ocelli, slightly conv. ; two small 
bristles between 0. v. and p. v. and small pair behind and between hind ocelli. Oc. 
inserted between the bright-brown ocelli, rather upright, div. The rows of bristles on the 
light frontal stripes end in a rather larger forward bent pair. Front view :—facial pit 
deep and black with a shallow dividing ridge which is greyer: with a side light the pits 
are also grey. Side view (Plate 21, fig. 56):—hind and lower eye-margins black, the 
jowls greyer beneath these. Antennal second joint black bristled, the top bristle long, 
third joint slightly pollinate, in the $ conspicuously reddened beneath, sometimes nearly 
all red, in the ? black. Stout vibrissee with a row of small bristles along the absolute 
lower edge of jowl; a large bristle on hind jowl. Palpi stout and bristled at the tip, in 
the g much reddened on the proximal one-third to two-thirds; in the ? usually only 
SECOND SERIES—ZOOLOGY, VOL. XVI. 47 
