THE REPTILES OF AUSTRALIA

BLUE TAILED (Kalabeck's) MONITOR
Varanus doreanus

and

FINSCH'S MONITOR
Varanus finschi was (Varanus doreanus finschi)

  
BLUE TAILED (Kalabeck's) MONITOR Varanus doreanus ©2011 John Fowler and Rachel Barnes

  
BLUE TAILED (Kalabeck's) MONITOR Varanus doreanus ©2011 John Fowler and Rachel Barnes

At least 1 confirmed specimen of Varanus doreanus has been photographed on Cape York Australia.
The Blue-tailed monitor is found on the tip of the Cape York Peninsula (Australia) , also New Guinea, New Britain and in the Bismarck Archipelago.

The existence of Varanus finschi from Cape York Queensland Australia is based on a single specimen without exact locality data.
Varanus finschi is also found in New Britain, New Ireland, the Bismarck Archipelagoes well as Eastern areas of Papua New Guinea

Both species is easily confused with the Mangrove Monitor, V. indicus, however Varanus doreanus is normally found inland away from mangroves.

Blue-tailed Monitor (Varanus doreanus)
Varanus indicus species-complex

Kalabeck's monitor
Wikipedia

Finsch's Monitor (Varanus finschi)
Varanus indicus species-complex

Finsch's Monitor
Wikipedia