376 Prof. Westwood’s Descriptions of 
in the venation of the wings in the sexes of L. brasiliensis 
is erroneous ; that no such difference in the venation of 
the wings of the two sexes of the same species can 
exist, and consequently that the genus Limnobiorhynchus 
‘“‘has no existence at all.” He consequently refers my 
male, L. brasiliensis, to the genus Llephantomyia, to 
which he assumes L. canadensis to belong, and my female 
to Toxorhina. Thus he adds :—‘‘ The confusion which 
for such a long time was connected with the existence of 
the genera Toxorhina and Limnobiorhynchus seems to 
have reached, or at least to be very near, its solution ! 
This confusion was principally due to the very striking 
coincidence that both Westwood and Loew possessed 
only males of a genus with a submarginal cell, and only 
females of another genus without a submarginal cell. 
Both of these authors were so much struck by the extra- 
ordinary prolongation of the proboscis in both genera 
that they united them into one, with this difference, 
however, that Westwood noticed the difference in the 
neuration, and-described it as sexual; Loew, on the 
contrary, entirely overlooked this difference.”’ 
In the Baron Osten-Sacken’s ‘ Western Diptera,’ pub- 
lished in the Bulletin of the U.S. Geol. and Geogr. 
Survey, vol. ili. No. 2, p. 196, he has sunk his genus 
Elephantomyia, and recorded my L. canadensis im the 
genus Geranomyia of Haliday. 
The synonymy of these genera will thus stand :— 
GERANOMYIA. 
Geranomyia, Haliday (1883), Curtis (1835). 
Limnoliorhynchus, Westw. (males only), 1835. 
Aporosa, Macquart, Loew. ~ 
Elephantomyia, Osten-Sacken. 
LIMNOBIORHYNCHUS. 
Limnobiorhynchus, Westw. (females only), 1835. 
Toxorhina, Loew (Bernstein, &c.), and ‘ Linnea Ento- 
mologica,’ vol. v. p. 400. 
