From Alfred's Essential Dictionary of Music Notation, pp 260-ff,
by Linda Lusk and Tom Gerou. Highly recommended.
Alfreds, ISBN: (ICBM? :) 0-88284-730-9
I don't think I am breaching copyright, as this is _information_.

Instrument families are normally in the following order
Woodwinds
Brasses
percussion
Other
Strings
and are traditionally from highest pitch to lowest.

String Quartet
Violin I
Violin II
Viola
Cello

Woodwind Quartet
Flute
Oboe
Clarinet
Bassoon

Woodwind Quintet
Flute
Oboe
Clarinet
French Horn
Bassoon

Brass Quintet
Trumpet I
Trumpet II
French Horn
Trombone
Tuba

Brass Sextet
Trumpet I
Trumpet II
French Horn
Trombone
Euphonium (baritone)
Tuba

Concert Band
Flutes
Oboes
Bassoons
Clarinets
Saxophones
Cornets/Trumpets
French Horns
Trombones
Euphonium (baritone)
Tuba
Timpani
Percussion

Jazz Band (Stage Band)
Saxophones
Trumpets
Trombones
Guitar
String or Electric Bass
Drums
Piano

Orchestra
Flutes
Oboes
Clarinets (Saxophone)
Bassoons (Saxophone)
French Horns
Trumpets
Trombones
Tuba
Timpani
Percussion
Other instruments (harp, piano, celesta, organ, voices, chorus, solo instruments or sometimes saxophones)
Violin I
Violin II
Viola
Violoncello
Contrabass