114 DIPTERA OF NORTH AMERICA. [PART IV. 



ducetl by me in Proc. Philad. Enloni. Soc. 18G5, p. 231) must 

 be abandoned. I have had the opportunity to see the original 

 specimens in Mr. Westwood's cabinet. The genus, as I had 

 anticipated in the Proc. Philad. Ent. Soc. (1. c.) is founded upon 

 the males of one genus and the females of another ; the males 

 are Geranomyise and the female is a Toxorrhina ; hence it came 

 that the genus was described as having a submarginal cell in the 

 male and none in the female. Limnohiorhynchus hraziliensis 

 Westvv. {%) is a Geranomyia ; the female is a Toxorrhina, 

 very similar to the male in coloring, and thus mistaken for the 

 same species. Limnobiorhynchits canadensis Westw. (%) is my 

 Geranomyia communis ; the female is not described. 



Toxorrhina seems to be exclusively confined to the American 

 continent. Besides the two species, described below, and the 

 two others, mentioned above ( T. fragilis Loew, from Porto Rico, 

 and T. braziliensis Westw. from Brazil), I am not aware of any 

 species having been described. 



The name Toxorrhina is derived from to^ov, a bow, and pw, 

 nose, in allusion to the long rostrum, which is arcuated in dried 

 (but not in living) specimens. 



Description of the species. 



1. T. magna 0. S. % and 9- — Thorax fusco-flavescens, vittis tribus 

 fuseis, fronte angusta ; alis immaculatis. 



Thorax brownish-yellow, with three brown stripes ; front narrow ; wiugs 

 immaculate. Long. corp. 0.5 — 0.6 (without the proboscis). 



Syn. Toxorrhina magna 0. Sacken, Proc. Phil. Eutom. Soc. 18G5, p. 2.32. 



Head jellowish-cinereous ; front narrow, brownish in the 

 middle ; antennas brown ; proboscis brown, about once and a 

 half the length of the head and the thorax taken together. 

 Thorax pale brownish-yellow, with three not very dark brown 

 stripes ; the intermediate one is rather broad ; its sides are 

 parallel and very well defined ; beyond the suture, the thorax, 

 including the scutellum and metathorax, is covered with a dense 

 gray bloom ; pleurse brownish-yellow, with a cinereous bloom. 

 Abdomen reddish-brown. Coxae yellow ; feet brownish-tawny ; 

 tips of the tibise and the tarsi, except the basis of the first joint, 

 brown. Wings hyaline ; costal veins yellowish-tawny, the other 

 veins brown ; the tip of the auxiliary vein is almost exactly 



