THE SAW FLY. 4^5 



The tenthredo femorata is, as the name imports, bur- 

 dened with two large thighs ; the whole infect is black, 

 except the antennae and tarfi of the feet, which are yel- 

 low f. 



The tenthredo lu^tuofa alni. This quiet, melancholy, 

 and beautiful fly is found among alder plantations, and is 

 often fatally entangled in the clammy juice that iffues 

 from their leaves. The head and trunk are of a fine yel- 

 lowiQi brown ; the antennoe a more dufky (hade of the 

 fame colour, and the eyes blue : The body is coal black ; 

 the fegments of a brownifh yellow ; the wings are of a 

 pale yellowifti brown, with little yellow rifings upon their 

 fibres, and a margin of yellow J. 



There are no lefs than fifty-five fpecies of the tenthre- 

 do enumerated in the Linncean fyflem ; but the Swedijb 

 naturalift feems himfelf to fufpeft, that fome kinds are 

 twice mtntioned. Colour, though an obvious, is no cer- 

 tain charafter of infedls. In fome, it differs with the fea- 

 fon, in others, with the fex ; and in all it glows accord" 

 jng to the creature's health and vigour. 



t Syft. Nat. fpec. i. i Barbut's Gen. Infcd. p. 238^ 



