14 
MR. F. WALKER ON DIPTERA COLLECTED AT 
streak extending from the base to one-third of the length; a black 
broad irregular oblique band beyond the middle; veins black ; discal 
transverse vein straight, parted by less than half its length from the 
border, and by about its length from the very oblique prebrachial 
transverse vein, which equals it in length; halteres white. Length of 
the body 6 lines; of the wings 10 lines. 
46. Dacus FuRCIFER, n. s. Mas. Anthracina, cinereo-tomentosa, 
antennis vix longis, arista plumosa, thorace vittis tribus nigricantibus, 
pedibus longiusculis, alis cinereis nigro bifasciatis, fascia 2* latissima, 
linea costali exteriore apicem versus furcata, halteribus albis. ‘ 
Male. Coal-black, with cinereous tomentum ; third joint of the antenne 
slightly tapering from the base to the tip, much shorter than the face ; 
arista plumose ; thorax with three blackish stripes; abdomen linear, 
narrower and very much longer than the thorax; legs rather long; wings 
cinereous ; apical part of the costa with a black line, which emits a 
fork towards the tip; a narrow black oblique band before the middle, 
and beyond the middle a very broad black band, which is oblique in 
the contrary direction; veins black; discal transverse vein very slightly 
curved outward, parted by about one-fourth of its length from the 
border, and by less than its length from the straight, upright prebra- 
chial vein, which is not more than half its length; halteres white. 
Length of the body 5 lines; of the wings 10 lines. 
47. Dacus EXPERTUS, n.s. Fem. Cyaneus, palpis, antennis pedibus- 
que nigris, thorace vittis tribus cinereis, pedibus breviusculis, alis 
cinereis, costa exteriore apicibusque nigris, venis transversis nigro 
marginatis, halteribus testaceis. 
Female. Dark blue; palpi, antennz, and legs black ; 3rd joint of the 
antenne linear, slender, extending to the peristoma ; thorax with three 
cinereous stripes; pectus cinereous; abdomen elongate-conical, a 
little longer and narrower than the thorax; legs short, stout; wings 
cinereous, black along the exterior part of the costa and about the 
tips; transverse veins clouded with black; discal transverse vein 
almost straight, parted by about half its length from the border and 
by about its length from the prebrachial transverse vein, which is 
oblique; halteres testaceous. Length of the body 4 lines; of the 
wings 8 lines. 
48. DAcus PERPLEXUS, n.s. Fem. Niger, capite luteo, facie nigro 
biguttata, antennis luteis longis, arista nigra nuda, thorace vittis tribus 
luteis, pectore maculis duabus trigonis luteis, abdomine fulvo lato 
striga brevi nigricante, pedibus luteis, alis limpidis, striga basali, vitta 
costali dentata vittaque postica angulata fuscis. 
Female. Black ; head pale luteous, with a piceous dot on the front, and 
with a round black dot on each side of the face; 3rd joint of the 
antennz extending to the peristoma, very slightly tapering from the 
base to the tip; arista black, bare ; thorax with a luteous stripe, with 
