230 [April 



perhaps confirmed me in the opinion that Toxorhina and Limnob'o- 



rhynchus are synonymous, as the most striking character ascribed by 

 Mr. Westwood to the latter genus is the disparity of the neuration in 

 both sexes. Since we possess the N. A. Toxorhina magna (% 9 )• 

 which agrees in all points with T. fragilis Lw. ( 9 b so much so that 

 there is no reason whatever to doubt of their belonging to the same 

 genus, it becomes extremely probable that the male of T. fragilis has 

 the same neuration as the female, that is. no submarginal cell ; and as a 

 corollary from this, it becomes evident that the three fossil species, known 

 in the male sex only, and possessing a submarginal cell, belong to a dif- 

 ferent genus. It being thus shown that two genera have been inadver- 

 tently united by Mr. Loew under the name of Toxorhina, it remains to 

 be decided which of them has a right to this name ? The name of 

 Toxorhina made its first appearance in connection with the fossil spe- 

 cies only, (Loew, Bernstein u. Bernsteinfauna, 185U), but no descrip- 

 tion whatever was attached to it at that time. At its second appear- 

 ance (Lihnaea Entom. 1. c.) it became indissolubly connected with the 

 living species T. fragilis. of which a full description and an excellent 

 tin 'ure were given. The fossil species were only incidentally mentioned, 

 and moreover, as has been already shown above, an erroneous impres- 

 sion concerning them was introduced, as if they had no submarginal 

 cell. Thus, the name of Toxorhina being connected with the species 

 fragilis by a full description and a figure, whereas no description, or. 

 if any, an incorrect statement, establish the claim of the three fossil 

 species upon this name, it seems evident that Toxorhina fragilis has to 

 retain its present generic appellation. In giving the detailed descrip- 

 tion of the genus, I have acted upon this conclusion, as well as on the 

 presumption that the two N. A. species belong to the same genus with 

 T. fragilis. The fact that there is no disparity in the neuration of the 

 two sexes of Toxorhina at once discards its supposed identity with 

 Limnobiorhynchus. 



To what genus, then, do the three fossil species belong? The data 

 in our possession are not sufficient to solve this question. If the as yet 

 unknown females of these species agree in their neuration with the 

 males, that is, if they have a submarginal cell, it is not impossible that 

 these species belong to Elephantomyia. On the contrary, if these 

 females have no submarginal cell, said species may belong to Limnobio- 

 rhynchus. I incline to believe, that the females of the fossil species 

 have the same neuration as the males, and that they belong either to 

 Elephantomyia or to a closely allied genus. But I go further than 

 this, and strongly susjyect that a genus like Limnobiorhynchus Westic. 



