44 



Genus LIV. TENTHREDO. 



GENERIC CHARACTER. 



Mouth with jaws, but no proboscis. Palpi 

 four, unequal and filiform. Wings extended, 

 swelled or slightly inflated. Sting with two 

 serrated, or saw-like laminae, nearly hidden 

 within the abdomen. Scutellum with two 

 small distant tubercles. 



General Observations. 



The great variation in the formation of the 

 Antennae of the Tenthredines, has induced Lin- 

 naeus to divide them into the following families, 

 founded upon that circumstance : 



1. With the antennae club-shaped. 



2. With the antennae not articulated, but of 

 one continued thread. 



3. With pectinated antennae. 



4. With the antennae somewhat club-shaped 

 and articulated, or jointed. 



5. With filiform antennae, having seven or 

 eight articulations, besides the base. 



