Buzzbox and delta, the 250 below 10k in class C applies only to VFR. STARS are IFR procedures so the limit does not apply (unless specifically annotated on the terminal area chart).
Not anymore, AIC H15/13
Sorry about the formatting, I copied using an ipad and this is as good as I could do.
65. AIRCRAFT SPEEDS
65.1 Unless required for safety reasons civil aircraft must not be operated at indicated airspeeds greater than the following:
Airspace Classification
Flight Rules
Speed
Class A
IFR
N/A
Class C
IFR
VFR
250kts below 10,000FT AMSL, except where specified in ERSA, DAP or varied by ATC *(Note 1)
250KT IAS below 10,000FT AMSL
Class D
IFR & VFR
200KT IAS -- at or below 2,500FT AAL within 4 NM of the
primary Class D aerodrome *(Note 2)
250KT IAS -- in the remaining Class D airspace
Class E
IFR & VFR
250KT IAS below 10,000FT AMSL
Class G
IFR & VFR
250KT IAS below 10,000FT AMSL
* Note 1: ATC may approve speeds in excess of the limits specified for Class C airspace in the table above for air traffic management or at pilot request.
* Note 2: If traffic conditions permit, ATC may approve a pilot’s request to exceed the 200 KT speed limit to a maximum limit of 250 KT unless the pilot informs ATC a higher minimum speed is an operational requirement.