Routing IRB on SRX

I have two VLANs, and two IRB interface for two guest VMs

Both two VLANs is associated with ge-0/0/5 interface and It is a same DMZ zone. 

They can't ping to each others. What is miss configuration?

Here is configuration 

show vlans
VLAN66 {
vlan-id 66;
l3-interface irb.66;
}
VLAN77 {
vlan-id 77;
l3-interface irb.77;
}

show interfaces irb
unit 66 {
family inet {
address 10.10.66.254/24;
}
}
unit 77 {
family inet {
address 10.10.77.254/24;
}
}

show security zones security-zone DMZ
host-inbound-traffic {
system-services {
all;
}
protocols {
all;
}
}
interfaces {
irb.66;
irb.77;
}