First Eremochetous Dipteron with Vestigial Wings. 323 
XLI.—The First Eremochetous Dipteron with Vestigial 
Wings. By Prof. M. Bezzi, Turin, Italy. 
In my paper on the reduction and disappearance of the wings 
in the Diptera* I have pointed out the fact that this pheno- 
menon is very rare in the suborder of the Diptera Brachycera. 
In a total of 384 cases observed (adding to my list on 
pp. 165-182 those appended at end of the present paper), we 
have the following figures :— 
Suborder Orthorrhapha Nematocera . . . 140 
Orthorrhapha Brachycera . . . 12 
Cyclorrhapha Athericera. . . . 282 
And even the few species of the Brachycera are represented 
exclusively by some Empidide and Dolichopodide, both 
belonging to the same group of the Orthogenya (Microphona). 
All the other groups of the suborder are exempt (the Hypo- 
cera being placed with the Cyclorrhapha) ; in the Knergopoda 
there are a few Asilide in which the wings show a tendency 
towards reduction both in the size and in venation, but these 
cases seem to be unworthy of consideration. It was therefore 
with the greatest interest that I received, some months ago, 
through the courtesy of Dr. Charles P. Alexander, Urbana, 
Ill., U.S.A., two specimens of a subapterous Dipteron from 
‘Tasmania, sent to him with a collection of Tipulide. Ona 
superficial examination the insect is indeed very like a wingless 
female of the genus Zipula, of which there are numerous 
cases in all parts of the world. It was first believed to be a 
Bibionid or a Rhagionid (Leptid), but at once I recognized 
in it a Chiromyzid, judging it to be a wingless female of some 
Australian species of Chiromyza or of Metoponia. 
In the meantime, a papert by Mr. G. H. Hardy, of the 
Australian Museum, Sydney, N.S.W., has appeared, in 
which an insect almost identical is described as a new genus 
and species under the name of Boreoides subulatus, with the 
interesting notice that it has been preserved for many years 
in the Melbourne Museum under the MS. name of Boreomyia 
subulata, Walker. The genus is considered to be nearly 
allied to Chiromyza. I am also of the same opinion. The 
atrophied mouth-parts, the form of the head and antenne, the 
* “ Riduzione e scomparsa delle ali negli Insetti Ditteri,”’ Rivista di 
Sci. Nat. “ Natura,” Milano, vol. vii. 1916, pp. 85-182, 11 figs. 
t ‘A Revision of the Chiromyzini (Diptera,” Proc. Linn. Soc, N.S. W. 
xlv. 1920, pp. 582-642, pls. xxix., xxx. 
