150 MB. WALKER ON DIETER A COLLECTED AT MAKESSAR. 
Female. Blue, long, narrow ; head black, depressed above, white about 
the eyes ; face very oblique, forming before the front a protuberance 
on which the antennae are seated, its fore part oblong quadrate, almost 
flat, with whitish furrows for the antennae ; palpi and antennae black, 
the latter reaching the epistoma ; 3rd joint linear, rather obtuse at the 
tip, six times the length of the 2nd ; arista cinereous, bare, hardly 
longer than the 3rd joint; thorax with three indistinct cinereous 
stripes ; abdomen aeneous-green, nearly linear, slightly compressed, 
much longer than the thorax ; oviduct protuberant, slender ; legs 
short, stout ; tibiae and tarsi black ; wings grey, blackish along the 
costa and about the transverse veins; veins and halteres black ; discal 
transverse vein straight, upright, parted by full one-fourth of its length 
from the border, and by much more than its length from the praebra- 
chial transverse. Length of the body 6 lines ; of the wings 12 lines. 
178. Dacus bilineatus, n. s. Feem. Fulvus, longiusculus, nigvo 
bivittatus, capite antennisque rufescentibus, arista plumosa, palpis por- 
rectis ; pedibus breviusculis nigro fasciatis, alis cinereis, costa vena- 
que transversa discali fusco nebulosis, halteribus testaceis. 
Female. Tawny, rather long; head reddish in front; epistoma rather 
prominent ; palpi porrect ; antennae reddish, nearly reaching the epi- 
stoma ; 3rd joint linear, rounded at the tip, about thrice the length 
of the 2nd ; arista somewhat plumose ; thorax elongate-elliptical, with 
two black stripes ; abdomen lanceolate, shining, with two broad black 
stripes, longer than the thorax ; legs rather short, with diffuse black 
bands ; wings grey, brownish along the costa and about the discal 
trausverse vein; veins black, tawny at the base; discal transverse 
vein nearly straight and upright, parted by one-fourth of its length 
from the border, and by much more than its length from the praebra- 
chial transverse ; halteres testaceous. Length of the body 4 lines ; of 
the wings 7 lines. 
179. Dacus imitans, n. s. Fcem. Cyaneus, angustus, capite atro, 
antennis pedibusque uigris, tarsis posticis basi albidis, alis cinereis, 
costa vittaque nigris, halteribus piceis. 
This species is closely allied to D. longivitta, and D. exigens and D. can- 
trahens belong to the same group. 
Female. Dark blue, narrow, with slight cinereous tomentum ; head deep 
black above, white about the eyes ; peristoma very prominent ; pro- 
boscis large ; antennas black, nearly reaching the epistoma ; 3rd joint 
linear, conical at the tip, about four times the length of the 2nd ; arista 
bare, slender ; abdomen fusiform, narrower and a little longer than 
the thorax ; oviduct protuberant, slender ; legs black, moderately 
long ; first joint of the hind tarsi whitish above ; wings cinereous, 
black along most of the costa to the tips, and black on the space be- 
tween the cubital and pra:brachial veins as far as the praebrachial 
transverse vein ; discal transverse vein straight, upright, parted by 
