212 Mr. F. Walker's Characters of undescribed Diptera 



abdomine pedibusque fulvis, tibiis posticis apice genubusque 

 nigris, tarsis nigris basi testaceis, alis cinereis apud costatn 

 fuscis, alulis subtestaceis, halteribus testaceis. 

 Male. — Black ; head shining in front, with testaceous tomentum 

 on each side beneath ; thorax with four broad hoary stripes ; 

 pectus testaceous; abdomen tawny, elliptical, a little longer than 

 the thorax ; legs tawny ; knees and tips of the hind tibiae black ; 

 tarsi black, testaceous at the base ; wings grey, brown along the 

 costa ; veins black ; praebrachial vein forming a curve at its 

 flexure ; discal transverse vein imdulating, parted by half its 

 length from the border, and by less than its length from the prae- 

 brachial ; alulae slightly testaceous ; halteres testaceous. 

 Length of the body 3^ lines ; of the wings 6 lines. 

 Port Natal. 



Idia ? simplex. 



Fcem. — Aureo-viridis, albido-tomentosa,capite testaceo, antennis 

 luteis, arista nigra, thorace quadrivittato, abdomine cupreo 

 lined dorsali, tibiis fulvis, tarsis piceis, alis sub-cinereis, costa 

 apicem versus fuscescente, alulis albidis. 



Female. — Golden green, with whitish tomentum ; head pale 

 testaceous, hardly prominent, whitish beneath ; proboscis black ; 

 palpi pale testaceous ; antennae pale luteous ; arista black, plu- 

 mose ; thorax with four stripes ; abdomen cupreous, depressed, 

 with a dorsal line ; tibiae tawny ; tarsi piceous ; wings very 

 slightly greyish, brownish along the costa towards the tip ; veins 

 black, testaceous towards the base ; prajbrachial vein forming a 

 rather obtuse angle at its flexure, nearly straight from thence to 

 its tip, which almost joins the cubital vein ; discal transverse vein 

 slightly undulating, parted by much less than its length from the 

 border, and by a little less than its length from the flexure of the 

 praebrachial ; alulae whitish. 



Length of the body 3\ lines ; of the wings C lines. 



Hindostan. 



In this species the characters of the genus are much modified. 



Idia ? varia. 



Fcem. — Viridis, capite testaceo maculis sex nigris, frontalibus 

 fulvis, proboscide nigro, antennis piceis, abdomine testaceo, 

 vitta fasciisque nigris, pedibus fulvis, alis cinereis, venis 

 nigris basi fulvis, alulis subtestaceis. 



Female. — Green, shining; head testaceous, with two black dots 



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