118 MAUD D. HAVILAND 
Trxt-Fiac. 16. 
—~—Kvalbelatt — 
= a 58 
o we XS = C3 
SSN: 
The same as fig. 15, more advanced. x 350. a.=anus. ct.= 
cuticle. dc. sh.=imaginal disk of sheath. de. st. imaginal disk 
of stylet. de v.=imaginal disk of valve. gl. p.=‘ poison gland ’. 
hp.=hypoderm. s. 11.=sternite of segment 11. 
of Scleroderma linearis; and of other parasitic 
Hymenoptera, the female Ichneumonid, Ophion, will 
sometimes pierce with the ovipositor when handled. The pain 
is more severe and persistent than a mere mechanical stab 
would produce, so that presumably some secretion enters the 
wound. Bordas and others have described structures in various 
Terebrantia which appear to be homologous morphologically 
with the poison glands of the Aculeata, but their function is 
