136 THE CANADIAN ENTOMOLOGIST. 



however it may have been with them when younger and in greater need 

 of protection. 



Taiiysphyrus levnice Fab. This is a very small thing, being among 

 the minutest of Rhj-ncophora, about .05 inch in length, though this does 

 not detract from its interest. Its trivial name is derived from the plant on 

 which it feeds, Lemna (minor), Duckweed, the little plant that floats on 

 stagnant waters in the summer, mantling them with green, and like the 

 insect, common to Europe and America. Though exceedingly abundant, 

 it does not seem to be generally known, appearing on few catalogues. It 

 occurs in August and September, and its presence may be known by 

 observing the little circular hole it has eaten through the centre of the 

 Lemna frond. They stay beneath the leaf as it lies on the water, or liquid 

 mud, and come to the upper surface when this is agitated. Such as emege 

 from clear water are entirely black, but those from the mud appear mot- 

 tled ; the dorsum of the thorax and elytra from which the mud is wiped 

 as they come forth between the contiguous edges of the fronds, is black, 

 while the other parts are more or less gray from the dried mud. No other 

 Rhyncophorus insect being found on this plant, this alone will suffice for 

 its identification when found. It has very long legs, and unhke most Cur- 

 culionides, the insect in death does not fold them under its body, but 

 spreads them out on either side. 



LIST OF DIPTERA TAKEN IN THE VICINITY OF 



MONTREAL, R Q. 



BY F. B. CAULFEILD. 



Determined by Dr. S. W. Williston. 



BIBIONIDyE. 



Bibio albipennis. Say. Common, end of May and beginning of June. 



TIPULID^. 



*Bittacomorpha clavipes, Fabr. Several specimens taken in a damp 

 meadow, June. 



XYLOPHAGID^. 



Xylophagus rufipes, Loew. Not common, June 7, 1877. 



CCENOMYID/E. 



Coenomyia ferruginea, Meig., pallida Say. Not rare on parts of Montreal 

 Mountain, June, 1883. I found them sitting on ferns in open 



