SPHYRACEPHALA. 



ESSENTIAL CHARACTER. 



Head extended each side in a process which 

 is ocuhferous at tip ; antennae inserted on the 

 front, third joint rounded, compressed, setigerous 

 at tip. 



NATURAL CHARACTER. 



Head suhtriangular ; eyes pedunculated, pe- 

 duncles very short, rohust; stemmata approxi- 

 mate ; antennae distant, rohust, short, nearly 

 parallel to the peduncles, three-jointed; first 

 joint very short, almost concealed ; second joint 

 ohconic, ciliated at tip; third joint orbicular, 

 setigerous at tip; proboscis bilabiated; palpi 

 elevated, conic ; metathorax w^ith a conic spine 

 each side beneath the wings ; scutel two-spined ; 

 poisers naked; wings incumbent; feet mode- 

 rate; anterior thighs dilated; anterior tibiae a 

 little arcuated. 



PLATE 52. 



q 



