Source : Webster's Revised Unabridged Dictionary (1913)

Croton bug \Cro"ton bug`\ (b?g`). [From the Croton water of New
   York.] (Zo["o]l.)
   A small, active, winged species of cockroach ({Ectobia
   Germanica}), the water bug. It is common aboard ships, and in
   houses in cities, esp. in those with hot-water pipes.

Source : WordNet®

Croton bug
     n : small light-brown cockroach brought to United States from
         Europe; a common household pest [syn: {German cockroach},
          {crotonbug}, {water bug}, {Blattella germanica}]