MR. WALKER ON DIPTEEA COLLECTED AT MAKESSAB. 151 



less than half its length from the border, and by very much more than 

 its length from the prajbrachial transverse ; halteres piceous. Length 

 of the body 31 lines ; of the wings 6 lines. 



180. Dacus exigens, n. s. Mas. Viridescente cyaneus, angustus, 

 capite rufescente piceo, antennis luteis, arista nuda, thorace vittis 

 tribus cinereis, pedibus fulvis, alis cinereis striga eostali 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, and by much more 

 than its length from the prajbrachial transverse ; halteres testaceous. 

 Length of the body 3^ lines ; of the wings 5^ lines. 



181. Dacus contrahens, n. s. Fam. Cyaneus, angustus, capite 

 supra atro apud oculos albo, antennis luteis, thorace vittis tribus cine- 

 reis, pedibus piceis, alis cinereis vitta eostali 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 Fosm. 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, shghtly 

 compressed ; abdomen slightly compressed at the base, linear, nar- 

 rower and a little shorter than the thorax in the male, fusiform and 

 much attenuated towai-ds the tip in the fetnale ; 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- 



