STRUCTURE OF PROBOSCIS OF OPHIDERES FULLONICA. 3885 
Figs. land 2)—is roughly triangular in transverse section, 
i.e. bayonet-shaped. Of the three surfaces of the bayonet 
Fie. 1, 
Fie. 1.—Proboscis of Ophideres fullonica drawn lying on one side. 
ot vt. Ventral teeth. 
dt dt. Dorsal teeth. 
it. Lateral teeth. 
6, Lateral barbs. 
dsp. Dorsal spines forming a frill along nearly one half of 
the length of the organ. 
vsp. Ventral spines. 
one forms the dorsal aspect of the proboscis and supports the 
frill of dorsal spines (d, sp, Fig. 1); the other two surfaces 
are symmetrical with each other, and may be called ventral- 
lateral surfaces, since they form the sides of the organ as seen 
in Fig. 1, and, by meeting along the edge (g in Fig. 2), 
they form its ventral aspect. The line (g) just mentioned 
is continuous with a narrow groove running along the ventral 
aspect of the proboscis (g, Figs. 2 and 3); at the distal ex- 
tremity of the line (q) is seen the orifice (0), by which the 
channel traversing the proboscis opens externally on the 
ventral aspect, thus resembling the canula of a subcutaneous 
syringe. 
It is clear that in using its proboscis the insect must 
employ a thrusting action, and not any kind of revolving 
movement ; the proboscis must accordingly be considered as 
a saw, not as an augur or gimlet. It is, in fact, a bayonet- 
