298 Mr. F.Walker's Characters of undescrihed Diptera 



Nemorcea erythropus. 



Foem. — Nigra, robusta, cinereo-tomentosa, capite albido, fron- 



talibus nigris, facialibus et epistomate testaceis, antennis rufis, 



articulo 3° nigro longissimo, thorace vittis quatuor nigris, 



abilomine cyanescente-nigro cinereo-tessellato subtus rufe- 



scente, pedibiis rufescente fulvis, tarsis nigris, alis sub-cinereis, 



alulis cinereis. 



Female. — Black, stout, with cinereous toinentiim : head whitish 



in front and beneath ; frontalia black, linear, the bristles on each 



side extending to half the length of the face ; facialia testaceous, 



without bristles ; epistoma testaceous, not prominent ; antennae 



nearly reaching the epistoma; first and second joints red; third 



linear, black, about four times the length of the second ; arista 



stout for nearly half the length from the base ; thorax with four 



black stripes ; abdomen bluish-black, tesselated with cinereous ; 



underside reddish, except at the tip; legs reddish, tawny; tarsi 



black ; wings greyish ; veins black, testaceous towards the base 



and along the costa ; prsebrachial vein forming a rounded and 



slightly obtuse angle at its flexure, near which it is hardly curved, 



and is thence straight to its tip ; discal transverse vein slightly 



curved inward, parted by less than its length from the flexure of 



the praebrachial, and by much less than its length from the border ; 



alulae cinereous. 



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

 Tasmania. 



Genus EuRiGASTER, Macq. 



Eurigaster sag'mata. 



Foem. — Nigra, valida, sub-cylindrica, capite albo, frontalibus 

 latis ferrugineis, palpis fulvis, antennarum articulo 3° clavato 

 truncaio basi ferrugineo, arista valida, thoracis vittis tribus 

 lateribus pectoreque cinereis, abdominis segmentis cinereo 

 late fasciatis, pedibus validis setosis, alis sub-cinereis basi 

 obscurioribus, vend praebrachiali angulum rectum fingente, 

 vena transversa discali sub-recta, alulis albidis. 



Female. — Black, stout, nearly cylindrical : head white, excepting 

 the vertex, which is black, and with stout bristles; frontalia broad, 

 ferruginous, hardly widening in front ; facialia without bristles ; 

 epistoma prominent ; palpi tawny ; antennae just reaching the 

 epistoma; third joint ferruginous at the base, widening to the tip, 

 which is truncated ; arista stout ; thorax with three cinereous 



