MB. WALKEB ON DIPTERA COLLECTED AT MAKESSAR. 15 1 
less than half its length from the border, and by very much more than 
its length from the praebrachial transverse ; hal teres piceous. Length 
of the body 3£ lines ; of the wings 6 lines. 
180. Dacus exigens, n. s. Mas. Viridescente eyaneus, angustus, 
capite rufescente piceo, antennis luteis, arista nuda, thorace vittis 
tribus cinereis, pedibus fulvis, alis einereis striga costali apiceque fuscis, 
halteribus testaceis. 
Male. Greenish blue, narrow ; head reddish, piceous above, white 
about the eyes, black in front ; antennae luteous, reaching the epistoma ; 
3rd joint slightly lanceolate, full four times the length of the 2nd ; 
arista slender, simple ; thorax with three cinereous stripes ; abdomen 
almost cylindrical, much longer than the thorax ; legs tawny ; tarsi 
black towards the tips ; wings grey, brown at the tips and with a brown 
streak on the middle of the costa » veins black, tawny towards the 
base; discal transverse vein straight, upright, clouded with brown, 
parted by less than half its length from the border, anti by much more 
than its length from the praebrachial transverse ; halteres testaceous. 
Length of the body 3i lines ; of the wings 5£ lines. 
181. Dacus contrahens, n. s. Foem. Cyaneus, angustus, capite 
supra atro apud oeulos albo, antennis luteis, thorace vittis tribus cine- 
reis, petlibus piceis, alis cinereis vitta costali interrupta nigricante, 
vena transversa discali nigricante nebulosa, halteribus albidis. 
Female. Dark blue, narrow ; head deep black above, white about the 
eyes, piceous in front ; antennae luteous, reaching the epistoma ; 3rd 
joint linear, conical at the tip, about six times the length of the 2nd; 
arista slender, simple; thorax with three cinereous stripes ; abdomen 
compressed, a little longer than the thorax ; legs piceous ; wings grey, 
with a blackish interrupted costal stripe, which is dilated at the tip of 
the wing ; veins black ; discal transverse vein clouded with blackish, 
parted by half its length from the border, and by a little more than 
its length from the praebrachial transverse ; halteres whitish. Length 
of the body 3 lines ; of the wings 5 lines. 
182. Dacus inaptus, n. s. Mas et Fatm. Viridis, capite atro, facie 
fulva basi alba, antennis piceis, pedibus halteribusque nigris, alis an- 
gustis cinereis. 
Male and Female. Green, with slight cinereous tomentum ; head deep 
black, white about the eyes ; face tawny, white at the base ; antennae 
piceous, reaching the epistoma ; 3rd joint lanceolate, full four times 
the length of the 2nd ; arista bare, long, slender ; thorax long, slightly 
compressed ; abdomen slightly compressed at the base, linear, nar- 
rower and a little shorter than the thorax in the male, fusiform ami 
much attenuated towards the tip in the female ; legs black, moderately 
long ; wings narrow, cinereous ; veins black, straight ; discal trans- 
verse vein straight, upright, parted by less than half its length from 
the border, and by almost twice its length from the praebrachial trans- 
