HETEROMYIA. 



ARTIFICIAL CHARACTER. 



Antennae porrect, filiform, fourteen jointed; 

 five terminal joints elongated; palpi exserted, a 

 little arcuated, four jointed ; basal joint shortest, 

 a little contracted in the middle; ocelli none; 

 eyes reniform; posterior feet much elongated, 

 slender, and with a single nail at tip; anterior 

 pair with somewhat elongated coxae, and much 

 dilated femora, armed with a series of short 

 spines on the anterior edge, on which the arcuat- 

 ed tibia closes. 



NATURAL, CHARACTER. 



Body moderately slender ; head small, round- 

 ed, flattened before; antennae in the middle of 

 the face ; first joint large, but not long ; the eight 

 following joints sub-oval ; the five terminal joints 

 long, not dilated, cylindric, each being twice the 

 length of one of the preceding ones ; eyes reni- 

 form, large, wider beneath, and approaching 

 above; stemmata none; palpi arcuated, four 



PLATE XXXV. 



