NATURAL SCIENCES OP PHILADELPHIA. 221 



takes this character from the 9 of L. brasiliensis the only specimen he 

 had. The wing of the 9 of L. canadensis is exactly similar to that of 

 the J*. 



Prof. Loew's genus Toxorhina (Loew, Bernstein and Bernsteinfauna, 

 Schulprogr. Berlin, 1850, p. 37, and Linn. Entom. v. p. 400, Berlin, 1851, tab. 

 ii. f. 16 23,) comprising several fossil and one living species (from Jamaica) 

 agrees in its characters with Limnobiorhynchus: it shows the same re- 

 markable obliteration of the radial vein in the 9i their identity has been 

 already suspected by Mr. Loew himself. He seems to have had only 9 speci- 

 mens in his possession ; although not expressly mentioned in his descriptions, 

 this fact can be inferred from them. It is highly probable therefore that the 

 tf Toxorhina has, like the $ Limnobiorhynchus, a complete 

 radial vein, or, in other words, that these two genera are synonymous. Mr. 

 Westwood's name, as the oldest, has the priority. 



It remains to be considered now, whether the species canadensis Westw. 

 really belongs to Limnobiorhynchus (=Toxorhina) as defined 

 by Mr. Westwood and Prof. Loew. The specimens of said species, which 

 I have before me, do not agree with the definitions of these authors in the fol- 

 lowing points : 1st. The neuration of the wings is the same in both sexes. 2d. 

 The antennae of Limnobiorhynchus (Toxorhina), are distinctly 

 stated by both authors to have long verticils on the terminal joints only, form- 

 ing a kind of pencil at the tip ; the verticils on the other joints are said to be 

 much shorter. This is not the case with E. canadensis: the verticils are 

 of equal length on all the joints of the flagellum. 3d. The front of Toxorhina 

 is mentioned by Prof. Loew as broad. ("The eyes, at least in theQ, says he, are 

 separated on the upper side by a considerably broad interval.) On the contrary 

 the front is remarkably narrow in my specimens. 4th. "The thorax," says Prof. 

 Loew, " is distinguished by the horizontal prolongation of the metathorax." 

 Nothing of the kind is the case with my specimens. 5th. The anal vein in 

 To x o r h i n a Lw. runs into the pobrachial at a considerable distance from the 

 base of the wing; the little cross-vein which seems peculiar to this genus, 

 unites the axillary vein with the pobrachial. In my specimens the anal vein takes 

 its usual direction towards the base of the wing and the little cross-vein is 

 situated between it and the axillary vein. 



Under such circumstances I thought that the establishment, at least provi- 

 sionally, cf a new genus, with L. canadensis for its type, would be the 

 most warrantable course to pursue in order to prevent further confusion. 



E. canadensis. Pallide silacea ; thorace vitta infuscata, femorum apice 

 fusco ; segmentis abdominis fusco marginatis ; alis subcinereis, stigmate ob- 

 longo, fusco; long. lin. 3 3J. 



Limnobiorhynchus canadensis Westw., Ann. Soc. Ent. de France, 1835, p. 

 683. 



Head yellow ; probscis covered with a fine pubescence ; antepnae yellow : 

 verticils black ; basal joints, especially the second, more or less infuscated. 

 Thorax yellow ; a more or less distinct brown stripe runs along its middle and 

 down the collare, (in some specimens this stripe is altogether obsolete) ; halteres 

 pale ; feet yellow ; femora brown at the tip. Abdomen yellow; posterior mar- 

 gins of the segments brown ; a more or less distinct brown stripe runs along 

 the middle of the tergum ; the last joint is brown in the tf ; the forceps are 

 tawny ; 9 ovipositor is ferruginous. Wings pale cinereous ; a slight nebu- 

 losity along the apical margin; stigma oblong, blackish brown ; no vestige of 

 Stigmatical cross-vein ; the mediastinal vein, as well as its cross-vein, are in the 

 middle of the distance between the stigma and the origin of the petiole ; the 

 latter is very short; discal areolet nearly square, the great cross-vein inserted a 

 little before its middle. 



In great numbers near Trenton Falls, N. Y., in July, 1859, (nob.) Canada, 

 (Westw.) 



1859.] 



