SOUTH AMERICAN DIPTERA. 257 



32. Blastocera speciosa Gerstaecker, Linu. Ent. xi. 342. — Brazil. 



Two specimens from Chapada. The dorsal stripes do not agree 

 quite with the description, nevertheless the identification is not 

 doubtful. 



33. Panacris lueitla Gerstaecker, Linn. Ent. xi. 347. — Cayenne. 

 One specimen, Chapada. 



34. Cyphomyia aurinaniiiia Wiedemann, Zool. Mag. iii, 54; Aual. Ent. 



13; Auss. Ins. ii, 54; Gerstaecker, Liun. Ent. xi, 276. — Brazil. 



Numerous specimens, Chapada. 



35. Cyphomyia spp. 



Two other species with the last, with abdominal spots, 1 cannot 

 identify with any known species. 



SYRPHIDiE. 



1. Mixogaster conopsoides Macq. 



Twelve specimens from Corumba, and one from Rio de Janeiro 

 Macquart's description does not apply very well, but the species I 

 believe to be his. The male front is broad as in the female. In the 

 female specimen from Rio de Janeiro the second segment of the ab- 

 domen is more slender, and the last section of the fourth vein is 

 sinuous, not broken, and without stumps. 



2. Microdon splendens Wied. 



Two female specimens from Chapada agree pretty well with the 

 description ; the color of the abdomen shows scarcely any steel-blue. 

 The first antennal joint is largely red at the base ; the spines of the 

 seutellum are remote, and there is no yellow at the tip of the abdo- 

 men. 



3. Microdon inirabilis n. sp. 



9 . — Length 15 mm. Black, but little shining ; third joint of antennte large ; 

 seutellum without points ; wings yellow and black. Head black ; face and cheeks 

 with white pile; front with black pile; third joint of antennae broad, longer 

 than the slender first joint; second joint very short. Mesouotum but very little 

 shining, nearly bare: humeri, post-alar callosities and the pleurae deep reddish 

 black. Seutellum small, oval, wholly witliout spines or emargination, bare. Ab- 

 domen bluish black, a little shining, bare, broader than the thorax on the second 

 segment, thence tapering regularly to the apex. Legs pitchy black, the four 

 front femora and tarsi largely deep red ; hind metatarsi cylindrical. Wings yel- 



TEANS. AMER. KNT. SOC. XV. (33) NOVEMBER, 1888. 



