150 MR. WALKER ON DIPTERA 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, shghtly 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 j 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, u. s. FcBm. Fulvus, longiusculus, nigro 

 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 

 transverse 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 prajbra- 

 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 nigris, tarsis posticis basi albidis, alis cinereis, 

 costa vittaque nigris, halteribus piceis. 



This species is closely allied to D. longivitta, and D. exigens and D, con- 

 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 ; antennae 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 praebrachial veins as far as the prsebrachial 

 transverse vein ; discal transverse vein straight, upright, parted by 



