Delimiters of two incoming series 1 Xbees

I have a total of 3 series 1 xbees communicating in transparent mode through serial. Two of them are sending incoming reads and one of them is receiving. I wanted to separate the incoming values with delimiters to know what value is coming from where.I’ve gotten up to this point with success. Problem now is I dont know how to label this incoming values through the receiving Arduino. I simply just want to add something like, "Serial.print("this is the first sensor = "); and so fourth for second sensor. I am just not sure where it is appropriate within the code. here is the code below:

Emitter : (code is the same for both )

// Example of sending numbers by Serial
// Author: Nick Gammon
// Date: 31 March 2012

const char startOfNumberDelimiter = '<';
const char endOfNumberDelimiter   = '>';
const int rssi_pin = 9; //RSSI Pin of the XBee Module
 int rssiDur;
 
 
void setup ()
  { 
  //srand (42);
  Serial.begin (38400);
  } // end of setup
  
void loop ()
  {
    
     rssiDur = pulseIn(rssi_pin, LOW, 200); //sending this val
     

  for (int i = 0; i < 10; i++)
    {
    Serial.print (startOfNumberDelimiter);    
    Serial.print (rssiDur);    // send the number
    Serial.print (endOfNumberDelimiter);  
    Serial.println ();
    }  // end of for

  delay (300);
  }  // end of loop

…and the receiver

// Example of receiving numbers by Serial
// Author: Nick Gammon
// Date: 31 March 2012

const char startOfNumberDelimiter = '<';
const char endOfNumberDelimiter   = '>';

void setup ()
  { 
  Serial.begin (38400);
  //Serial.println ("Starting ...");
  } // end of setup
  
void processNumber (const long n)
  {
    Serial.print("bike 2 = ");
  Serial.println (n);
  }  // end of processNumber
  
void processInput ()
  {
  static long receivedNumber = 0;
  static boolean negative = false;
  
  byte c = Serial.read ();
  
  switch (c)
    {
      
    case endOfNumberDelimiter:  
      if (negative) 
        processNumber (- receivedNumber); 
      else
        processNumber (receivedNumber); 

    // fall through to start a new number
    case startOfNumberDelimiter: 
      receivedNumber = 0; 
      negative = false;
      break;
      
    case '0' ... '9': 
      receivedNumber *= 10;
      receivedNumber += c - '0';
      break;
      
    case '-':
      negative = true;
      break;
      
    } // end of switch  
    
  }  // end of processInput
  
void loop ()
  {
  
  if (Serial.available ())
    processInput ();
    
  // do other stuff here
  } // end of loop