LAMB—DIPTERA: HETERONEURIDA, ORTALIDA, TRYPETIDA, SEPSIDA, ETC. 329 
26. Drosophila notabilis, n. sp. (Fig. 16 and Plate 19, figs. 14, 15). 
A remarkable form with constricted waist, small wings, and a very peculiar 
frontal marking. 
Head. yes finely and sparsely pilose. Top view (Plate 19, fig. 14) :—frons 
very broad, shining, with broad eye-margins and a remarkably demarcated central 
area as figured. This central area is translucent greyish bordered by brown-orange, 
the broad eye-margins are similar in colour. The front f. 0. points forward, the hind 
one outwards and backwards, i. v. convergent, o. v. divergent, p. v. absent. The oc. 
stand nearly upright, parallel and bending forward at the tip. Front view :—the face 
is shining orange with an elongate knob between antenne. 
Side view (Plate 19, fig. 15):—the eyes are rounded in front; | 
the mouth projects somewhat ; the antennee are orange, 3rd 
joint paler: 2nd joimt swollen and nearly as big as the 
3rd with a fine short bristle in front; the 3rd is pubescent, 
Fig. 16. Drosophila notabilis, 
especially so at tip, the arista with six upper, three lower a. x BO 
and a terminal ray, the inner row is evident though sparse. 
Fine single vibrissee, a few bristles on the hinder jowl; orange hind head, with fine 
post-orb. row. The clypeus above the palpi is very large indeed; palpi darkened, 
club-shaped, hairy ; tongue darkened and hairy. 
Thorax darkened orange. Two d. ¢. with fine small rows extending in a line to 
the front. The acr. bristles indistinct, two rowed. No sign of humeral bristles, one 
behind the humeri which may be a single notopleural; two close together on the 
side above and just before base of wing. Scutellum tawny-orange, crossed terminal 
bristles, a very minute basal pair. 
Wings as Fig. 16, translucent with brown veins. Halters with longish white 
heavy and bituberculated darker stalks. 
Legs. Yellow, bristles very few; one inner outstanding pre-apical on front 
femora; pre-apical and 2 or 3 small crowning bristles on the mid tibia: the rest 
are not clearly visible owing to the state of the specimen. 
Abdomen with much constricted waist, the first 3 segments dull orange, the last 
segments shining black, all sparsely bristled, the marginal bristles the longer. 
Size, over 2 mm.; wing, under 14 mm. 
Locality. Seychelles. Mahé: marshes on coastal plain, Anse aux Pins and Anse 
Royale, I. 1909; Anonyme Island, I. 1909. 
27. Drosophila fracticosta, n. sp. (Fig. 17 and Plate 19, fig. 16). 
This (and the next two species) have a remarkable break at the end of the first 
section of costa; this ends in a swollen projection of the costa which is somewhat 
spear-shaped, black, and very bristly. 
The present species must be near to D. gratiosa, de Meiyere (Tijdschr. v. Ent., 
54, 1911, p. 404) with which it agrees fairly closely in general facies and in head and 
thoracic characters, but the abdominal characters are quite different. 
