102 WALKER ON DIPTERA OE AHU ISLANDS. 



tellum tawny hindward ; pectus white ; abdomen tawny, with a few 

 spines towards the tip, hind borders of the third and fourth segments 

 and tips black ; legs long, black, coxa3 and femora testaceous ; wings 

 grey, veins very broadly bordered v/ith pale brown, prsebrachial vein 

 forming a slightly obtuse angle at its flexure, between which and its 

 tip it is slightly curved inward, discal transverse vein undulating, 

 parted by about half its length from the border, and by a little less 

 than its length from the flexure of the prsebrachial ; alulae cinereous 

 Length of the body 4 lines ; of the wings 9 lines. 



Gen. Peosena, St.-Far^. 



91. Prosena argentata, n. s. Mas et Foem. Testacea (mas) aut 



. nigra (foem.)^ capite thoraceque argenteis, antennis fulvis, abdomine 



longo fasciis vittaque nigris (mas) aut breviore fasciis cinereis lateri- 



busque basi testaceis (foem.)j pedibus nigris femoribus testaceis, alis 



subfuscescentibus (mas) aut cinereis (foem.). 



Male and Female. Head and thorax with bright silvery tomentum, 

 facialia without bristles, epistoma slightly prominent ; eyes bare ; 

 mouth black, testaceous towards the base, full as long as the thorax ; 

 antennae tawny, not reaching the epistoma, arista plumose; legs 

 black, coxa; and femora testaceous ; wdngs grey, veins black. Male. 

 Testaceous. Pectus mostly white; abdomen elongate-conical, with 

 slight whitish reflexions, dorsal stripe and hind borders of the seg- 

 ments black ; legs long ; wings brownish towards the costa and about 

 the veins, prsebrachial vein forming a slightly obtuse angle at its 

 flexure, between which and its tip it is very slightly curved inward, 

 discal transverse vein hardly undulating, parted by less than half its 

 length from the border, and by less than its length from the flexure 

 of the prsebrachial. Length of the body 5 lines ; of the wings 10 lines. 

 Female. Black. Pectus silvery; scutellum deep black; abdomen 

 conical, with broad cinereous bands, first and second segments with 

 broad interrupted testaceous bands, a testaceous mark on each side 

 of the third segment at the base; legs rather long, femora with black 

 tips ; prajbrachial vein forming a right angle at its flexure, curved in- 

 ward from thence to its tip, discal transverse vein curved inward near 

 its hind end, parted by less than its length from the border and from 

 the flexure of the prsebrachial. Length of the body 3^- lines ; of 

 the wings 7 lines. 



Subfani. Saecophagides, WalJc. 

 Gen. Saecophaga, Meigen. 



92. Sarcopiiaga compta, n. s. FcBm. Nigra, cinereo-tomentosa, 

 capite aurato subtus fulvo piloso, thorace vittis tribus nigris, abdo- 

 mine tessellato, alis obscure cinereis. 



Female. Black, with cinereous tomentum. Head gilded in front, 

 clothed behind and beneath with tawny hairs, frontalia deep black. 



