150 MR. WALKER ON DIPTERA COLLECTED IK AMBOTNA. 



facialia without bristles except by the epistoma, which is prominent. 

 Eyes pubescent. Palpi long, tawny, Antennse reaching the epistoma ; 

 3rd joint linear, somewhat obtuse at the tip, fully six times the length 

 of the 2nd; arista long, slender, stouter towards the base. Thorax 

 with four black stripes ; the middle pair slender ; a black band hind- 

 ward. Abdomen oval, very little longer than the thorax, with black 

 spines towards the tip ; 2nd, 3rd, and 4th segments with white bands 

 on their fore borders, that on the 2nd segment very slight. Legs 

 stout. Wings greyish, rather short, blackish at the base and along 

 most of the length of the costa and of the veins ; prsebrachial vein 

 forming a hardly obtuse and slightly rounded angle at its flexure, 

 from whence it is very slightly curved inward to its tip ; discal trans- 

 verse vein undulating, parted by much less than its length from the 

 border, and from the flexure of the prajbrachial. Alulae white. Hal- 

 teres whitish. Length of the body 4a- lines ; of the wings 8 Unes. 



43. Phorocera decedens, n. s. Mas. Nigra, capite albo supra 

 aurato, frontahbus nigris antice sublatescentibus, oculis pubescentibus, 

 palpis fulvis, antennarum articulo 3° lineari longissimo, thorace aurato 

 vittis quatuor nigris, scutelh basi nigro, abdomine ovato fasciis tribus 

 latis interruptis cinereis, pedibus robustis, alis cinereis, alulis albis. 



Male. Black, with long, black bristles. Head white, gilded above, 

 clothed with white hairs beneath ; frontalia black, widening slightly 

 in front, with a few black bristles on each side ; facialia with bristles 

 along nearly the whole length from the epistoma, which is not pro- 

 minent. Eyes pubescent. Palpi tawny. Antennae almost reaching 

 the epistoma ; 3rd joint linear, rounded at the tip, six times the length 

 of the 2nd ; arista long, stout for more than one third of its length. 

 Thorax gilded, with four slender black stripes, the lateral pair inter- 

 rupted; scutellum black at the base; pectus cinereous. Abdomen 

 oval, with black spines towards its tip, hardly longer than the thorax ; 

 three broad cinereous interrupted bands on the fore borders of the seg- 

 ments. Legs stout. Wings grey ; praebrachial vein forming a right 

 angle at its flexm-e, beyond which it is curved inward ; discal trans- 

 verse vein slightly undulating, parted by a little less than its length 

 from the border, and by a little more than its length from the flexure 

 of the praebrachial ; alulae white. Length of the body4i lines; of 

 the wings 8 lines, 



44. Phorocera basitincta. n. s. Mas. Nigra, lata, capite albo 

 supra cinereo, frontalibus atris antice latescentibus, oculis pubescen- 

 tibus, antennarum articulo 3° longissimo subobtuso, thorace albido 

 vittis duabus gracillimis nigris, abdomine ovato subtessellato, pedibus 

 robustis, alis cinereis basi et apud costam nigricantibus, alulis albis. 



Female. Black, broad, thickly beset with long black bristles. Head 

 white, cinereous above : frontalia deep black, widening in front, with 

 black bristles along each side ; facialia with bristles along nearly the 



