Why Can't Debian Find libusb?

[Stephen Rasku <srasku@wurldtech.com>]

I have a package that depends on `libusb` but it's not detecting that 
it's installed.

    # dpkg-query -s libusb
    dpkg-query: package 'libusb' is not installed and no information is
    available
    Use dpkg --info (= dpkg-deb --info) to examine archive files,
    and dpkg --contents (= dpkg-deb --contents) to list their contents.

However, if I list all the packages and grep for `libusb` I can find it.

    # dpkg-query -l | grep libusb
    dpkg-query -l | grep libusb
    ii  libusb-0.1-4:amd64             2:0.1.12-25 
amd64        userspace USB programming library
    ii  libusb-1.0-0:amd64             2:1.0.19-1 
amd64        userspace USB programming library

What gives?  How can I get this to detect these `libusb` libraries?
I have the source for the package I am trying to install so I can modify 
the meta-information if that's necessary.

This is the Depends section of the package I am trying to install:

    Package: my-package
    Architecture: any
    Depends: ${shlibs:Depends}, ${misc:Depends}, libusb, fxload
    Description: <insert up to 60 chars description>

--
Stephen Rasku
Linux Developer
Wurldtech Security Technologies