LAMB—DIPTERA: HETERONEURIDAL, ORTALIDA, TRYPETID A, SEPSIDA, ETC. 351 
lower part and mouth-margin silvery-orange; the jowls like upper eye-margins, but 
in side view more shiny brown on mouth-margin. Hind head dark, except where the 
swollen upper eye-margins extend downwards. Antenne dark brown, except the outer 
margin of second joint, which is paler; arista pale with four or five upper, three lower, 
and one terminal stout hair. Palpi dark blackish brown; tongue yellow. Cheetotaxy 
and eyes as in generic description. 
Thorax. The dorsum is elegantly variegated in light grey and darkish-brown. 
A brown-black central stripe from the front to back, which carries the acr. row; on 
each side is a broad grey stripe which is divided longitudinally by an interrupted 
brown stripe forming a brown elongate spot on the grey just before suture, and an 
irregular brown mid-line thence to scutellum: this line is just joined to the middle 
brown line by a little bar about midway between the two pairs of d. c.’s; from humerus 
to wing bases is another brown line, attenuated in front. Humeri grey, a very fine 
line of grey along the suture to the wing base; below this the pleure are brown, followed 
by a grey line parallel to the brown one and starting from the front cox; the sterno- 
pleura brown. Scutellum, brownish-black, two indistinct white basal spots, and a dis- 
tinct terminal one. Wings with venation and mottling as shown in Fig. 33. Halters 
darkish orange-grey, paler stalks. Legs: cox black-brown, femora same except for 
white tips; tibia with 5 sub-equal rings, beginning basally these are white, brown, white, 
brown, white; tibia orange. Front femora with two or three long bristles below, and 
outside. 
Abdomen. All dark shining brownish black. 
Size, just under 14 mm.; wing, about 14mm. 
Localities. Seychelles. Mahé: Cascade Estate, 800 feet and over, 1908—9; near 
sea-level (Anonyme Island), I. 1909. 
ECHIDNOCEPHALUS, n. g. 
There are 5 specimens of a species which is allied by its venation to Liomyza. In 
general macroscopic appearance it is much like the new Geomyzid genus Amygdalops 
(p. 357), and it is remarkable that such a close superficial similarity in facies exists 
(Plate 20, fig. 40). 
Head. Eyes entirely bare. Top view (Plate 21, fig. 41):—head more than twice 
as broad as long, excessively excavate behind, so that plan is like a crescent with 
rounded horns: the frons widens gradually from the antennze to just beyond last f. o., it 
then widens suddenly to the vertex, which is about twice as wide (along the margin) as 
the breadth of frons. There are three f. 0., a small one just on the edge of the frons, a 
stouter one behind, and a still stouter about the level of the front ocellus; all the f. 0. are 
slightly bent backwards and very slightly outwards: i. v. sub-parallel, o. v. slightly 
diverging ; beyond these, and a little below the vertex is a pair of much smaller divergent 
bristles; there is a row of small post-orbital bristles. Tiny p. v. down behind vertex. 
Long sub-parallel oc. inserted outside the line joining ocelli, but equidistant from them. 
Front view (Plate 21, fig. 42) :—the face is very small, broader than high; the antennze 
