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



Male. — Black ; pectus with dark cinereous tomentum ; abdomen 

 with black apical plumes ; wings blackish, grey and hyaline 

 towards the tips. 



Length of the body 6 lines ; of the wings 10 lines. 



Valley of the Amazon. 



Genus Phthiria, Meig. 

 Pldh'iria lurida. 



Nigro-fusca, capite antico fulvo, thorace fulvo-hirto, scutello 

 fulvo, abdomine fasciis tribus anterioribus latis interruptis 

 fulvis, alls subcinereis, basi costaque luridis, halteribus apice 

 albis. 

 Blackish brown ; head tawny in front ; proboscis and antennae 

 black, the former hardly longer than the thorax ; thorax with 

 short tawny hairs ; scutellum tawny ; abdomen with three broad 

 anterior interrupted tawny bands ; hairs short, black ; legs black ; 

 wings greyish, with a lurid tinge at the base, and along most of 

 the length of the costa; halteres with white knobs. 

 Length of the body 3 lines ; of the wings 8 lines. 

 Para. 



Phthiria lineifera. 



Nigra, subtus cano-hirta, capite, thorace, scutello segmentisque 

 abdorainalibus testaceo-marginatis, pedibus fulvis, alis cinereis, 

 costa fuscescente, venis nigris, halteribus testaceis. 



Black, with hoary hairs beneath ; head with a testaceous line 

 about the eyes ; thorax and scutellum with a testaceous border ; 

 hind borders of the abdominal segments testaceous ; legs tawny ; 

 wings grey, brownish along the costa for three-quarters of the 

 length ; veins black ; halteres testaceous. 



Length of the body 2 lines ; of the wings 4 lines. 



Australia. 



Genus Geron, Meig. 

 Geron albidum. 



Nigrum, albido-pilosum, pedibus albido-tomentosis, alis lim- 



pidis, venis halteribusque albis. 

 Black, rather thickly clothed with whitish hairs ; legs with 

 whitish tomentum ; wings limpid ; veins and halteres white. 

 Length of the body 2\ lines ; of the wings 5 lines. 

 Valley of the Amazon. 



