Capt. P. P. King's South American Diptera. 345 



basi et metapedes nigra : alee hyalinse, iridescentes ; squamulce fuscse ; 

 casta apicem versus obscurior ; nervi nigri, basi fusci : halteres fusci. 

 Taken at Port Famine in the Straits of Magellan. 



37. SVRPHUS BASALIS, H. ,J. 



Chalybeus, scutello apice fulvo, abdomine ceneo-fusco, pedihus flavisfusco macu- 



latis, alls hifaUnis. 

 Corp. long. 24 lin. Alar. 5 lin. 



Caput chalybeum, antic^ flavum : oculi rufo-fusci : antennce fuscse : thorax 

 chalybeus, utrinque fulvo pubescens ; scutellum apice fulvum : abdomen 

 aeneo-fuscum, utrinque fulvo pubescens, apice nigro-seneum : pedes flavi, 

 pubescentes ; femorum apices supvk nigro-seneo maculati ; metapedum, 

 femora tibiceqiie fusco-aenea apice basique flava, tarsi fusci : ake hyalinse, 

 iridescentes ; squamulce et nervi fusca ; casta ala; apicem versus obscurior : 

 halteres flavi. 

 Taken at St. Paul in Brazil. 



38. SyRPHUS IRIDIPENNIS, n. s. 



Mas. ^neus, ahdomine fusca-chalybea, pedibus rtifis fusca cingulatis, alis 



fuscis. 

 Corp. long. 3J lin. Alar. 7^ lin. 



Syrpho obscuro similis : seneus, fulvo parcfe pubescens : caput nigrum, antice 

 albidum: oculi rufo-fusci, postice lanugine alba circumdati : antenna- 

 fuscre: thorax obscure aeneus, supra violacco univittatus, subti^s cha- 

 lybeus ; scutellum Ipete aeneum : abdomen fuscum, chalybeo nitens : pedes 

 obscur^ rufi ; femora fusco cingulata; metapedum femora tibia;que fusca, 

 ilia apice basique rufa : alee obscurfe fuscse, iridescentes ; nervi nigro- 

 fusci ; squamulce et halteres fusca. 



39. SVRPHUS TARSALIS, «. S. 



Chalybeus, thorace ceneo-atro, pedibus fuscis, metatarsis albis, alis hyalinis antice 



nigro-fuscis. 

 Corp. long. 5 lin. Alar. 8^ lin. 



