MB. WALKER ON DIPTEEA COLLECTED IN AMBOTNA. 155 



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

 white, shining, gilded on each side of the frontalia, which are deep 

 black and very slightly widening in front; facialia without bristles, 

 except by the epistoma, which is not prominent. Eyes pubescent. 

 Antennae nearly reaching the epistoma; 3rd joint linear, somewhat 

 obtuse at the tip, four times the length of the 2nd ; arista long, stout 

 for nearly half the length from the base. Thorax with cinereous to- 

 mentum and with black stripes, the middle pair slender ; scutellura 

 testaceous. Abdomen elongate-oval, with black spines which are 

 mostly towards its tips, and with three broad cinereous bands on the 

 foreborders of the segments. Legs stout. Wings grey ; prse- 

 brachial vein forming a right angle at its flexure, beyond which it is 

 curved inward ; discal transverse vein with its hind part much curved 

 inward, parted by much less than its length from the border and by 

 rather less than its length from the flexure of the prajbrachial ; alulte 

 white. Length of the body bh, lines; of the wings 11 lines. 



41. Masicera prominens, n. s. Fcem. Nigra, subcylindrica, sat 

 angusta, capite albo, frontalibus nigris antice vix latescentibus, oculis 

 nudis, antennarum articulo 3° lineari apice rotundato, thorace albido 

 vittis quatuor angustis nigris, abdomine longi-ovato, pedibus robus- 

 tis, alis cinereis apud costam fuscescentibus, alulis albis. 



Female. Black, rather narrow, nearly cylindrical, with numerous long 

 bristles. Head white, shining; frontalia black, hardly widening in 

 front, with a few bristles along each side ; facialia with bristles towards 

 the epistoma, which is slightly prominent. Eyes bare. Antennae 

 nearly reaching the epistoma ; 3rd joint linear, rounded at the tip, 

 about four times the length of the 2nd ; arista long, stout for one- 

 third of the length. Thorax with whitish bloom, and with four slen- 

 der black stripes. Abdomen elongate-oval, longer than the thorax, 

 with black spines towards the tip. Legs stout. Wings grey, brown- 

 ish along the costa ; praebrachial vein forming a right angle at its 

 flexure, beyond which it is slightly curved inward ; discal transverse 

 vein hardly undulating, parted by very little less than its length from 

 the border, and from the flexure of the praebrachial ; alulae white. 

 Length of the body 4 lines ; of the wings 7j lines. 



Gen. Phokocera, Macq. 



42. Phorocera expellens, n. s. Mas. Nigra, robusta, frontalibus 

 atris linearibus, facie alba, oculis pubescentibus, palpis longis fulvis, 

 antennarum articulo 3° lineari longissimo subobtuso, thorace vittis 

 quatuor fasciaque postica nigris, abdomine ovato fasciis tribus albis, 

 alis cinerascentibus breviusculis basi et apud venas nigricantibus, alulis 

 albis, halteribus albidis. 



Male. Black, stout. Head and thorax with pale gilded tomentum ; 

 frontalia deep black, linear, with bristles along each side ; face white; 



11* 



