576 ANALES DEL MUSEO NACIONAL DE HISTORIA NATURAL 



dorsal surface (normal dorsal) which is Lollowed above, a « liorn » 

 resnlting at each córner, a tuft of black liair on eacli « horn » ; a 

 posterior surface wliich is liat (development from tbepreapical dorsal 

 ilat área, a cbaracteristic of tbe subgenus Phalacromyía) ; and a flat 

 ventral surface,. lower lateral margins of scutellum witb several 

 bristle-like long bairs (tbe normal marginal scutellars) ; femora and 

 tarsi more or less yellowisb brown, tibiae darker and clotbed witb 

 long sbaggy black bair ; bind tibia greatly enlarged and arcuate; (as 

 in some species of Mallota) tbe bind tarsi strongly incrassated 

 (more so tbau in Microdon). Wivg : Distinctly but not uniforudy 

 darkened ; marginal cell open ; ai>ical crossvein, witb bow above tbe 

 middle ; spurious veiii ratber weak ; squamae infuscated ; balteres 

 darkened. Abdomen : Sliort and broad, dark sbining broAvn. Lengtb 

 <S mm. ; wing 8 mm. 



One female. 



Type locality. Misiones. 



Type : In Museo Historia Natural de Buenos Aires, n° 7600, C. 

 Spegazzini leg., 1907. 



[Recibido para su publicación eu febrero de 1928.] 



