New mexico constitution
Article IV: legislative department
Section 8

The senate shall be called to order in the hall of the senate by the lieutenant governor. The senate shall elect a president pro tempore who shall preside in the absence of the lieutenant governor and shall serve until the next session of the legislature. The house of representatives shall be called to order in the hall of said house by the secretary of state. He shall preside until the election of a speaker, who shall be the member receiving the highest number of votes for that office.