Mr. Seward to Count Wydenhruck.
I regret to say United States consul, Matamoras, wrote despatch June 27, received to-day, namely :
Maximilian was executed on the 19th; city of Mexico surrendered on 21st.
United States consul, Vera Cruz, wrote despatch received and telegraphed from New Orleans July 2, confirming the execution of Maximilian and surrender at discretion of the city of Mexico.
Count Wydenbruck, &c., &c., &c.