| Part I:  Hypolleural row of bristles
    not present _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ 1   Part II:  Hypopleural bristles present
    (Fig.
    1)  _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _  11   = = = = = = = = = = = = = = = = = = = = = =
    = =   1.  Wing vein #6 very short; 7th vein
    curves under 6th; 4th vein straight _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ Fannia
    (Homalomyia)        Wing vein #6 longer; 7th
    vein straight; 4th vein bowed near its distal end (Fig. 2)  _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _  2   2.  Proboscis long and directed forward;
    equiped for piercing _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _   3        Proboscis not very long;
    labella thick and not for piercing _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 5   3.  Arista rays feathery (Fig.
    3) [Tse-tse flies of Africa] _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _ _  Glossina spp.  Distribution        Arista rays simple and
    not feathery _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
    4   4.  Palps shorter than proboscis _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
    _ _ _ _ _ _ _ _ _ _ _ Stomoxys
    spp. & Head &  Mouthparts        Palps almost as long as
    proboscis _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ Haematobia spp.   5.  Arista naked _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _  Synthesiomyia
    spp.        Arista toothed and
    feathery on the top side _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _ _ _ Hemichlora spp.   6.  Species are about as large as
    bumblebees with prominent black and yellow pile _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ Hypodermodes
    spp.        Species smaller like the
    housefly and without dense black and yellow pile  _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _  7   7.  Metallic blue-black or green color with
    stripes evident on the thorax anterior margin _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _   8        Color solid gray or
    black _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 9   8.  A bristle on middle tibia surface
    beyond center _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _  Pyrellia
    spp-1,  Pyrellia spp-2        Bristle on middle tibia
    may be present but greatly reduced in size _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _ _ _ Morellia spp.   9.  Wing's 4th vein clearly angled at
    terminus (Fig. 2); sternopleural
    bristles 1:2; eyes are bare _ _ _ _ _ _ _ Musca spp-1.  Musca
    spp 2.        Fourth wing vein's
    terminus slightly bowed (Fig. 4) _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 10   10.  Eyes are covered with hair;
    sternoplural bristles 2:2 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ Myiospila spp.         Eyes without hair;
    sternopleural bristles 1:2 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _  Muscina spp.   11.  Body color grayish or black and never
    shiny metallic; arista bare or pubescent 
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 12         Body is either
    blue-green or metallic blue, or only the abdomen is shiny metallic
    blue-black _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 13   12.  A curly yellow pile among the thorax
    macrochaetae with a black shiny background _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ Pollenia rudis         Thorax not yellow and
    curly pile has 4 distinct grayish lines _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _ Wohlfahrtia vigil   13. Wing's first vein basal section with fine hairs _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _  14         Wing's first vein basal
    section bare _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
    17   14.  The face and bucca are yellow with a
    yellow pile; one posthumeral bristle present _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ Callitroga spp.         Bucca black with black
    hairs; frequently 2 posthumeral bristles present _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 15   15.  White squamae and anterior acrosticals
    (alt. spelling - acrostichals) separated from surrounding hairs _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ 16         Squamae darker and
    anterior acrosticals are not distinct from surrounding hairs; prothoracic
    spiracles is black _ _ Protophormia spp.   16.  Four intra-alar bristles present; 6 or
    more marginal scutellar bristles and the mesothoracic spiracles a dark
    orange or black color _ _ _         _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _Protocalliphora spp.         Two intra-alar bristles
    present; 4 marginal scutellar bristles and mesothoracid spiracles is a
    light-orange color _ _ _ _ _ _ Phormia spp.   17.  Calypter or lower squamae's upper
    surface is bare (Fig. 1) _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
    Lucilia spp.         The upper surface of calypter is obviously pilose _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _  18   18.  Two bristles occur near the middle on
    the exterior surface of front tibia; one sublateral bristle is present _ _
    _ _ _ _ Cynomyopsis spp.         Only one but rarely 2
    bristles near the middle on the exterior surface of front tibia; 3
    sublateral bristles present _ _ _ _ Calliphora spp.   = = = = = = = = = = = = = = = = = = = = = = = =   SEPARATE KEYS TO MUSCINA, CALLIPHORA   & LUCILIA SPECIES   MUSCINA   1b.  Legs completely black; palpi reddish yellow
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Muscina pascuorum        Legs not completely
    black and frequently some yellow present. 
    If black then palpi are also black _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _  2b   2b.  Palps black; tibiae are mostly black
    although they may have a yellow tinge _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ Muscina assimilis        Palpi yellow; tibiae and distal portion of femora are yellow
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _  Muscina
    stabulans   CALLIPHORA  [Calliphora viridescens - Head;
    C.
    viridescens - Thorax; Calliphora sp.
    -Wing]   1c.  Three intra-alar bristles present _ _ _
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ Calliphora livida   2c.  Two intra-alar bristles present and
    bucca black.  A reddish beard
    present _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Calliphora vomitoria        Two intra-alar bristles
    present but bucca is brownish or reddish; beard is black _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ _ _  Calliphora vicina   LUCILIA   1d.  Two postacrosticals present (Fig. 1)
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ Lucilia illustris   2d.  Three postacrosticals present, and
    palpi are black _ _ _ _ _ _ _ _ _  _
    _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _  Lucilia silvarum        Three postacrosticals present
    but palpi are yellow _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
    _ _ _ _ _ _ _ _ Lucilia sericata     |