Do note that syscall numbers vary by architecture -- these are for 32-bit x86. Up to 190 is rather short too -- it's now I think 357, latest being sys_bpf.
I like the "ausyscall" command for querying syscall numbers in general, e.g. "ausyscall --dump i686".
Ah I was about to inquire were the system calls for async I/O were. That explains it.