Li bell II la. 



Ill 



greatest breadth, 8mm. Head of moderate size, roughly- 

 pentagonal, transverse width about 6mm. ; rather long 

 from front to back, owing to the extent of mask pro- 

 truding (Fig. 26). Antcniur seven-jointed, the basal two 

 being short and swollen, the rest slender ; of these 

 joints 4 and 5 are short, and 7 is pointed. Mask 

 reaching to between the insertion of the fore- and mid- 

 legs, narrow at hinge, deeply spoon-shaped, and covering 

 the face ; middle lobe and the two })al{3i meeting at a 



Fig. 26. — Head of Xvmph of Libellula quadrimaculata. 



(Much magnified ; hairs omitted.) 



point in the front of the head ; palpi triangular, serrated 

 where they approach in the mid-line, and hairy along 

 the outer margin ; two half circles of hairs on the body 

 of the mask on the upper surface behind the insertion 

 of the palpi ; front border of mask produced in a rather 

 obtuse angle. Eyes at the lateral corners of head small, 

 rounded, with a prolongation almost perpendicularly 

 backwards towards the mid-line of the head. Top of 

 licad convex. Vertex somewhat raised. Oeeiput rather 

 narrow in centre, nearh" rectangular, hair}- ; hind margin 



