The sting must therefore pierce the cervical ganglions; the centre of innervation upon which the rest of the organism is dependent.

This can only be reached in one way: through the neck.

Here it is that the sting will be inserted; and here it is inserted in a breach in the armour no larger than a pin's head.

Suppress a single link of this closely knit chain, and the Philanthus reared upon the flesh of bees becomes an impossibility.
That honey is fatal to larvae is a fact pregnant with consequences.
Various predatory insects feed their young with honey-makers.

Such, to my knowledge, are the _Philanthus coronatus_, Fabr., which stores its burrows with the large Halictus; the _Philanthus raptor_, Lep., which chases all the smaller Halictus indifferently, being itself a small insect; the _Cerceris ornata_, Fabr., which also kills Halictus; and the _Polaris flavipes_, Fabr., which by a strange eclecticism fills its cells with specimens of most of the Hymenoptera which are not beyond its powers.