WALKER ON DIPTERA OP ARU ISLANDS. 113 



Male. Deep black, shining, very short and broad. Head transverse, 

 slightly rugulose; third joint of the antennae conical; arista thinly 

 plumose; thorax very finely punctured; scutellum almost semicir- 

 cular ; abdomen blue, smooth ; tarsi yellow ; wings black, dark grey 

 towards the hind border, with whitish points towards the costa; discal 

 transverse vein parted by about its length from the border and by 

 more than its length from the prsebrachial transverse. Length of the 

 body 2^ lines ; of the wings 5 lines. 



Gen, Platystoma, Latr. 



127. PlatyvStoma fusifacies, n. s. Mas et Foem. Cinerea; capita 

 postice et apud oculos albo; vertice pallide luteo (mas) aut rufo 

 (foem.) ; facie plana, fusiformi, subargentea ; anteanis piceis ; thoracis 

 vittis tribus peetoreque canis ; abdomine conico punctis albis ; alis 

 iimpidis, guttis transversis interioribus fasciisque exterioribus nigri- 

 cantibus. 



Male and Female, Cinereous. Head white hindward and about the 

 eyes, black and shining towards the mouth ; vertex pale luteous in 

 the male, red in the female ; face flat, fusiform, somewhat silvery ; 

 antennae piceous, third joint long, slender, linear, arista plumose; 

 thorax with three hoary stripes, the middle one much broader than 

 the lateral pair; pectus hoary; abdomen conical, with numerous 

 white points ; wings limpid, with blackish dots towards the base, and 

 with four exterior blackish bands, two of which are dilated towards 

 the costa, and there contain some limpid dots; veins black, discal 

 transverse vein straight, parted by about one-fourth of its length from 

 the border, and by more than its length from the praebrachial trans- 

 verse ; halteres whitish. Length of the body 3|-5 lines ; of the wings 

 8-10 lines. 



128. Platystoma multivitta, n. s. Mas. Cinerea; capite postice 

 et apud oculos albo, vertice luteo, facie et antennis fulvis ; thoracis 

 vittis octo peetoreque canis ; abdominis segmentis cano fasciatis ; 

 ventre ferrugineo ; pedibus nigris ; alis Iimpidis, fasciis quatuor stri- 

 gisque interioribus nigricantibus. 



Male. Cinereous. Head white behind and about the eyes, vertex luteous ; 

 face and antennae tawny, third joint of the latter long, slender, linear ; 

 arista very slightly plumose ; thorax with eight hoary stripes ; pectus 

 hoary; abdomen with a hoary band on the fore border of each seg- 

 ment ; legs black ; wings limpid, with four blackish bands, and with 

 some blackish marks nearer the base ; two blackish streaks between 

 the first and second bands ; veins black ; discal transverse vein straight, 

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

 more than its length from the praebrachial transverse ; halteres black. 

 Length of the body 4 lines ; of the wings 8 lines. 



8* 



