896 



AN INTRODUCTION TO ENTOMOLOGY 



Fig. 1 135. — Wings of Pamphilus. The veins are lettered. 



Family SIRICID^ 



The Horn-tails 



The common name horn-tails is applied to members of this 

 family because the last abdominal segment bears a more or less 

 horn-like prolongation. This is short and triangular in the males, and 



is a prolongation of the last ven- 

 tral segment; in the females it is 

 long and often spear-shaped, and is 

 a prolongation of the last dorsal 

 segment. 



The body is cylindrical (Fig. 

 1 136); the head large and widened 

 behind the eyes; the pronotiim is 

 right-angled, so that it presents both 

 a strictly dorsal and a cephalic as- 

 pect, the latter concave; vein Sci of 

 the front wings is absent (Fig. 1 13 7) ; 

 the propodeum is divided longitu- 

 dinally ; the anterior tibi« each with 

 only one apical spur; the sheath of 

 the ovipositor is ver}^ long and exserted beyond the end of the ab- 

 domen; the ovipositor is fitted for boring. 



Fig. 1 136. — Tremex coliimba. 



