Fro 84 



Frontal, {ant. frontalis). — (Antennoe.) Inserted 

 directly upon the brow. (L. frontale — front 

 stem of frons.) 



Frontal area. — A small triangular space, marked off 

 by sutural lines, lying just above tlie clypeus in 

 the Hymenoptera Aculeata (ants). 



Frontal fissure. — The arcuate impressed line, seen 

 in Diptera, immediately above the antennae, 

 continuing over the face to the border of the 

 mouth. 



Frontal ganglion. — The three-cornered nerve- 

 centre of the three nerves running from the 

 sub oesophageal ganglion round the oesophagus 

 and uniting above it. 



Frontal lunule— A small crescent-shaped piece above 

 the antennas, which in the case of Cyclorrhapha is 

 typically characteristic. 



Frontal nerve. — Arises from the anterior border of 

 the frontal ganglion and extends into the 

 clypeus, where it bifurcates. 



Frontal stripe. — Sometimes termed vitta frontalis ; 

 the coloured stripe noticeable in some Diptera, 

 on the middle of the frons. 



Frontal suture. — The suture separating the frontal 

 lunule from that part of the head immediately 

 above it. Frequently the suture extends down 

 on either side to as far as the mouth. 



Fulcrum. — The second part, constituting the legs 

 of the Hemiptera, it inosculates anteriorly with 

 the Coxa, and posteriorly with the thigh or 

 Femur. (Douglas and Scott.) (li. a prop.) 



