LAMB—DIPTERA: HETERONEURIDA, ORTALIDAL, TRYPETID AM, SEPSIDA, ETC. 309 
the pre-apical tibial bristles are small except on the middle pair of legs which have also a 
stout terminal tibial spine ; the legs all clothed with small black bristles. 
Abdomen. Dark shining brown, covered with long bristly yellowish hairs. The 
male has a well-marked knobbed hypopygium with the usual pair of scale-like 
appendages. 
Size, including antenne, 2°8 mm.; wing, 2°1 mm. 
Localities. Seychelles. Silhouette: Mare aux Cochons, IX. 1908; low coconut- 
planted country near Pointe Etienne, 17. [X. 1908. Mahé: Anonyme Island, I. 1909. 

Fig. 1. Heteromeringia plumicornis, n. sp. x 35. 
2. Heteromeringia mgrifrons, nu. sp. (Fig. 2 and Pl. 19, fig. 2). 
This is a black somewhat shining species and is more like the normal forms of the 
genus than is the last one. 
Head. Eyes bare. Top view :—hind margin distinctly concave; frons uniformly 
and entirely shining black; cheetotaxy normal; front f. o. b. touching, next two pairs 
parallel; i. v. converging; o. v. fairly divergent; p. v. very divergent, inserted just on 
vertex between hind ocelli; these bristles are black; oc. b. very minute and pale. Front 
view :—antennz nearly touching at base; vibrissee touching, a row of fine following 
bristles; face all yellow-orange. Side view (Plate 19, fig. 2):—jowls orange in front 
getting blacker to hind of head which is shining black behind the eyes. Post-ocular 
bristles extending along top of eye. Hind jowls with bristles, a few long ones on hind 
margin of head. Antennz all clear orange yellow, except the flagellum of the arista 
which is darkened; the 2nd joint has one upper and two lower bristles and a row of 
minute marginal bristles; the pubescence of the arista follows the aristal colour and is 
normal. The finely bristled palpi are much flattened in the horizontal plane; the distal 
third is orange the rest black ; tongue orange. 
Thorax. Entirely black, the dorsum and scutellum very slightly roughened, pleura 
and metanotum very shining. The chtotaxy is normal: two principal d.c. b., a third 
rather smaller just in front of the front pair, h., two n. p., strong s. a. and p. a. 
Dorsum covered with fine bristles, except behind. Scutellum with two long terminal b., 
and two small dorsal near them. A stout mes. p. and st. p. b. Legs yellow except the 
end of the front femora, all the front tibize and tarsi, and the hind tibize (except tips) 
which are black ; all the femora with rows of bristles: front femora with a close set lower 
row and a row of 4 or 5 longer ones behind; middle femora with two rows below, front 
40—2 

