T'JIOM NEW GUINEA. 121 



third joint. Thoi'ax with four cinereous zigzag partly connected stripes. 

 Pectus with six incomplete cinereous stripes. Abdomen a little 

 shorter than the thorax, with a hoary band on each segment ; tip 

 reddish, shining. Legs yellow ; tibise with two black bands ; tarsi 

 black towards the tips. Wings whitish, with very numerous blackish 

 dots, some of which form three incomplete exterior bands; veins 

 black, pale yellow at the base ; discal transverse vein straight, very 

 oblique, parted by less than one-fourth of its length from the border, 

 and by much more than its length from the prsebrachial transverse 

 vein; halteres whitish. Length of the body 4 lines; of the wings 

 8 lines. 



51. Platystoma devocata. Mas. Nigra, capite albido macula 

 furcata gutta maculisque duabus anterioribus nigris, palpis albis, 

 antennis albidis basi supra nigris, thorace vittis quinque cinereis, 

 scutello abdorainisque segmentis albido marginatis, tarsis albis, alls 

 oigricantibus apice cinereis fasciis guttularibus albis, halteribus 

 albidis. 



Male. Black, dull. Head whitish ; a black spot on the vertex, forked 

 in front, and a black dot above the base of the antennae ; face with a 

 black spot on each side. Palpi white. Antennae whitish, black above 

 towards the base, much shorter than the face; third joint conical i 

 arista plumose. Thorax with five cinereous stripes, and with a 

 whitish callus on each side ; scutellum with a whitish border. Ab- 

 domen oval, shining, a little shorter and narrower than the thorax ; 

 hind borders of the segments whitish. Femora with whitish tips ; 

 tarsi white, with black tips. Wings blackish, cinereous towards the 

 tips, with many white dots which form three incomplete bands; one 

 complete exterior white band; veins black; discal transverse vein 

 straight, parted by one-fourth of its length from the border, and by 

 much moi*e than its length from the prsebrachial transverse vein; 

 halteres whitish. Length of the body 2i lines; of the wings 5 lines. 



52. Platystoma diminutiva. Foem. Nigro-cinerea, capite anten- 

 nisque rufescentibus, abdomine stylo tenui apicali, tibiis pallide flavis, 

 tarsis basi albis, alis nigricantibus fasciis guttularibus albidis. 



Female. Cinereous black. Head reddish, a little broader than the 

 thorax ; face short ; epistoma flat. Proboscis retracted. Antennae 

 reddish, shorter than the face ; third joint linear ; arista bare, very 

 slender, a little longer than the third joint. Abdomen narrower and a 

 little longer than the thorax, with a slender apical style. Legs 

 blackish; tibise pale yellow, with black tips; tarsi white towards the 

 base. Wings blackish, with numerous minute whitish dots which 

 form incomplete bands ; veins black ; discal transverse vein curved 

 outward, parted by less than one-third of its length from the border, 

 and by nearly twice its length from the prsebrachial transverse vein. 

 Length of the body 2 lines ; of the wings 3 lines. 



