ANNALS 



OF 



The Entomological Society of America 



Volume XV J U N E , I 9 2 2 Number 2 



ON THE SOUTH AMERICAN SPECIES OF THE 

 DIPTEROUS GENUS CHIROMYZA WIED. 



By Professor M. Bezzi, 

 Turin, Italy. 



In the recently published Revision of the Chiromyzini by 

 Mr. G. H. Hardy* Australian forms only have been dealt 

 with. In the present paper the writer will take into consideration 

 South American forms only. 



Agreeing with Verrall (Brit. Flies V, p. 44) the Chiromyzini 

 are accepted here as a tribe of the family Stratiomyiidae, chiefly 

 on account of the form and position of the prsefurca; but they 

 have many important characters in common with the Rhag- 

 ionidce. 



The main character of the tribe is that of the atrophied 

 mouth parts, which must be in correlation with some peculiar 

 habits of the adult flies. In addition may be recorded the 

 sunken face and the greatly developed and apparently bisected 

 front coxse. The third antennal joint is more or less distinctly 

 annulated; the last abdominal segments of the female are 

 ovipositor-like; the tibiae are not spurred. The wings have the 

 ambient vein complete, even if sometimes very thin; a short 

 praefurca; only 4 posterior cells, all open; the anal cell closed 

 and stalked, but long. 



Because of the normally developed mouth parts the genus 

 Allognosta must be placed in the Beridini. 



A peculiar feature of the Chiromyzini is the great varia- 

 bility in venation of the wings. Mr. Hardy points out that in 



♦Proceedings of the Linn. Soc. of N. S. W. XLV, 1920, p. 532-542, pi. XXIX- 

 XXX. ^ 



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