1. An insect trap head for use with bottles having varied sized externally threaded bottle necks comprising: a cylindrical top section having a circular horizontal section and a side wall section, the horizontal section having an entry opening with a diameter no greater than 1 inch, an annular flange section upwardly extending from the horizontal section encircling the entry opening, the side wall section extending peripherally downward from the horizontal section, the side wall section having an exterior surface and an interior surface, a connecting strip extending from the exterior surface of the side wall section, the connecting strip having a distal end which is attached to a cap of sufficient size to engage the flange on the horizontal section, and when engaged, providing a leakproof seal, a first set of threads projecting radially inward from the interior surface and being axially orientated to enable the top section to screw onto a bottle with an externally threaded neck, a ring-shaped bottom section extending peripherally from the side wall section of the top section, the bottom section having a second exterior surface and a second interior surface, a second set of threads projecting radially inward from the second interior surface and axially orientated to enable the bottom section to screw onto an alternative bottle with an externally threaded neck requiring a different orientation of threads than that of the first set of threads, and a conical insect entryway section disposed in the entry opening of the top section, the insect entryway section having a circular base entryway surface, an entryway skirt section, and an apex surface area, the base entryway surface positioned flush onto the horizontal section of the top section encircling the entry opening, the entryway skirt section peripherally extending from the base entryway surface, the entryway skirt section gradually tapering as it projects downwards, the entryway skirt section having a plurality of circular skirt openings for venting the bottle, the circular skirt openings having a diameter no greater than 1/16 inch, the apex surface area emerging from the entryway skirt section, the apex surface area defining a bottom opening no greater than 21/64 inch in diameter.