LAMB—DIPTERA: HETERONEURIDA, ORTALIDA, TRYPETID®, SEPSIDA, ETC. 347 
orange, covered with very regular rows of fine bristles. Three distal bristles in front 
inferior femoral row : large spur to middle tibia. 
Abdomen. All orange, about 2% irregular lines of discal and a line of slightly longer 
marginal bristles. 
The female has little or no silvery sheen on the head; she has a short stout pointed 
ovipositor, the hump is rather conical and hairy : the abdominal segments are sometimes 
a little darkened distally. 
Size, 24 mm. ; wing, just under 25 mm. 
Localities. Seychelles. Silhouette: Mare aux Cochons, over 1000 feet, IX. 1908; 
near Mont Pot-d-eau, ca. 1500 feet, VIII. 1908. Mahé: Cascade Estate, at or above 
800 feet ; Mare aux Cochons district, 1000—2000 feet, II. 1909. Félicité: XII. 1908. 
42. Drosophila melanogaster Meig., System Beschr., vi. (1830), 85. 9. 
This insect under the above name and the synonym D. ampelophila Loew (see 
Austen, Ent. Mag., 1905, p. 276) has been recorded from most parts of the world. 
There are many specimens in the collection that can be referred without doubt to the 
males of this species. 
Localities. Seychelles. Silhouette: Mare aux Cochons, over 1000 feet. Mahé: 
Cascade Estate. Félicité: XII. 1908. 
43. Drosophila similis, n. sp. (Fig. 31 and Plate 20, figs. 33, 34). 
g This is a small species which is exceedingly like D. melanogaster. Its front legs, 
however, are devoid of the extraordinary combs that are found in the latter species. 

Fig. 31. Drosophila similis, n. sp. x 40. 
Instead of these concentrated combs, under a high power (about 60) one can see on the 
under side of the first two joints of the tarsus a row of smaller combs each of about half 
a dozen teeth (Plate 20, fig. 33): the first joint has 4 such tiny combs, the next has 
about 3. All the joints are covered with stout bristly short hairs as well. In all the 
characters of colour, cheetotaxy, &c., the two species appear to be almost absolutely in- 
distinguishable. The hind f. 0. is rather differently inserted, being slightly nearer the 
front one and more remote from the i. v. than in D. melanogaster, and the auxiliary bristle 
between the f. 0. is a little more in line. There is also some difference in the front and 
SECOND SERIES—ZOOLOGY, VOL. XVI. 45 
