How to control motors with an arduino
Others asking for a circuit diagram may seem pedantic BUT it is REALLY hard to follow the wiring diagram you have provided. 

WARNING !!! - you seem to be using an L293D (NOT an L295) in a powerdip package - you MUST specify the correct IC and the pkg used and vey desirably a datasheet link.

L293d datasheet



Pin 13 on your diagram is not grounded and should be. 

As shown only the left hand motor is fully connected.
You must drive Inputs 1 &amp; 2 either 


Low high or 
High low 


for motor to operate.
Low low or high high = no operation. 

Enable 1 must be low for motor operation. 

5V on your diagram is fed to Arduino RST but NOT to Vin.
Has the Arduino got 5V power? 

If you have wired it as shown (with the corrections notes - extra ground and the Arduino powered) and drive it as above then "it must work" [tm] :-)