| 
   
    | 201a
    (200a).    Front legs not raptorial  |      
   
    | 202a (201a).    Fore wing with 2 or more branches of R-s arising from the apparently fused
    stems of
    R-1 and R-s |    
   
    | 202b.    Fore wing with all branches of R-s
    arising from a single sector |    
   
    | 203a
    (202a).    Antennae moniliform in both sexes; ocelli absent; ovipositor not exserted  |        
   
    | 204b.    Fore wing with apparently 2 radial sectors (R-s),
    one of which is R-2+3 and the other R4+5
    .......... (Neuroptera)  Sympherobiidae |      
   
    | 205b.    Not as previously described  |    
   
    | 206a
    (205b).    Ocelli absent  |         
   
    | 207b.    Humeral cross vein not forming a recurrent vein; discal
    area of wings not differentiated from marginal area |    
   
    | 208a
    (207b).    Vertex
    (= top of head)  flattened  |      
   
    | 209a
    (208a).    Costal cross veins not forked  |    
   
    | 209b.    Costal cross veins forked  |              
   
    | 212b.    Wings much narrower than above  |    
   
    | 213a (212b).    Antennae quite distinctly club-like or flattened, subcostal
    cell without cross vein |      
   
    | 214a
    (213a).    Antennae about as long as
    head and thorax  |              Major
  Families of Adult Entomophagous Strepsiptera:   (Adults)  (Immatures)   Males (for Females go to 222) <Separate Key>   <Habits>; <Adults> & <Juveniles>  [Latest Classification]   
   
    | 217a
    (5a & 73b).    Tarsi with fewer
    than 5 segments and clawless  |      
   
    | 218a (217a).    Tarsi with 4 segments  |    
   
    | 218b.    Tarsi with 2-3 segments  |    
   
    | 219a (218a).    Antennae with less than 7 segments |              
   
    | 222a
    (58a & 76a).    Adult stage
    partially endoparasitic, without legs, antennae or eyes |      Females (for Males
  go to 217)   <Habits>; <Adults>
  & <Juveniles>  [Latest Classification]   
   
    | 223a (222a).    Cephalothorax (= head + thorax) without
    hook-like projections behind spiracles  |      
   
    | 224a
    (223a).    Cephalothorax with single
    pair of spiracles; thoracic segments not well defined |    
   
    | 224b.    Cephalothorax greatly elongated, with 2 pairs of spiracles,
    or with head and thoracic segments
    distinct .......... Strepsiptera)    Callipharixenidae |    
   
    | 225a
    (224a).   
    Parasitoids of Homoptera or Gryllidae
     |        
   
    | 226b.    Brood-passage opening broad and semicircular;
    thorax reduced and ring-like in back of brood-passage opening. .. (Strepsiptera) 
    Elenchidae |    Major
  Families of Adult Entomophagous Lepidoptera:   
   
    | 227a (10a, 38a, 48a & 80a).    Antennae simple or
    modified, but usually not swollen apically; hind wing with frenulum (= bristle
    or group of bristles arising at humeral angle);  ocelli often present ........... (Lepidoptera) 
    (Heterocera)   <Habits>  [Latest
    Classification] |      
   
    | 228a (227a).    Wings absent or greatly reduced in
    size  |    
   
    | 228b.    Wings normally developed.  |    
   
    | 229a (228a).    Moth does not develop in a sac
    constructed by the larva  |          
   
    | 231a (228b).    Hind wing with 3 anal veins; fore wing
    usually with 1st anal vein reaching wing margin |    
   
    | 231b.    Hind wing with 2 anal veins, rarely
    with 1  |    
   
    | 232a (231a).    Hind wing with veins S-c+R-1 and R-s
    widely separate beyond discal cell  |    
   
    | 232b.    Hind wing with veins S-c+R-1 and R-s fused or closely
    parallel between discal cell and wing tip  |    
   
    | 233a (232a).    Fore wings with radial (accessory)
    cell  |      
   
    | 234a (233a).    Proboscis vestigial  |    
   
    | 234b.    Mouthparts usually developed, with scaled proboscis  |        
   
    | 236a (231b).    Fore wing with single complete anal
    vein  |      
   
    | 237a (236a).    Shaft of antennae tapering evenly from
    base to tip  |      
   
    | 238a (232b & 237a).    Hind wing with S-c
    usually free from R-s along the cell, though sometimes
    extending near it (also see couplet 230)…(Lepidoptera) 
    Pyralidae
    (Chrysauginae, ......... Phycitinae, Pyraustinae)   <Habits>;
    <Adults> |    
   
    | 238b. 
    Hind wing with Sc fused with Rs for short distance
    before the middle of cell ..... .. Noctuidae |    
   
    | 239a (234b).    Maxillary palpi straight and extend
    forward horizontally, or vestigial  |      
   
    | 240a (239a).    Basal segment of antenna simple, though
    often with scales, hairs, or bristles |      
   
    | 241a (240a).    Hind wing with well-developed anal
    region; venation almost complete  |    
   
    | 241b.    Hind wing narrow-lanceolate or linear;
    venation often reduced.  |    
   
    | 242a (241a).    Hind wing with anal vein not distally
    forked  |          
   
    | 244a (241b).    Fore wing with discal cell formed  |      
   
    | 245a (244a).    Hind tarsi without evident groups of
    bristles  |      
   
    | 246a (245a).    Fore wing with discal cell set
    obliquely, the end distinctly closer to the hind margin than to
    costa; vein Cu-2 very short and usually extending
    directly back to wing margin |    
   
    | 246b.    Fore wing with discal cell axial and central; vein Cu-2
    normally long and continuing parallel
    with median veins (also see couplet 247) ....... (Lepidoptera) 
    Lavernidae &  Cosmopterygidae   <Habits>;
    <Adults>  |        248.  Major Families
  and Some Subfamilies of Adult Chalcidoidea:   <Overview>; <General
  References>   Generalized
  drawings of Chalcidoidea morphology by Noyes & Valentine (1989) are  Presented in Figs.A-G.   For greater detail on
  major geographic areas also Please refer to Regional Keys as follows:       
   
    | 248a (123b).    Hind femur enlarged, with ventral teeth, either a few large
    or many small ones (saw-like)
    (Fig.A); hind
    tibia not quite equal to femur and arched; specimens usually 5-15 mm, broad
    bodied, rarely <1-2 mm ...... A. |    
   
    | 248b.    Hind femur not enlarged, ventral teeth, if present, 2 or
    less, or ventral edge serrated  (Fig. A); hindtibia straight (rarely half length
    of femur); specimens usually 1-10 mm., robust to fragile  |    
   
    | 249a (248a).   Prepectus reduced or fused (Fig.A), not readily apparent, of if so, not
    triangular in outline
    (Fig.A) ..... A |    
   
    | 249b.    Prepectus in the form of a triangular
    plate (Fig.A)  |    
   
    | 250a (249a).    Ovipositor directed horizontally [in
    most species not extended beyond tip of abdomen]; tegula almost an oval
    disc; fore wing not folded longitudinally; posterior gena with distinct
    ridge; body often large but not usually metallic (Figs.A-D) ...... A .....  Chalcididae  <Habits>;
    <Adults> & <Juveniles>   (also Fig. 56) |    
   
    | 250b.    Ovipositor curved upwards over abdomen (Fig.A); male abdomen covered by pitted hard  covering of fused dorsal plates (Fig.A ); tegula narrowly extended forward,
    ladel-like; fore
    wing often folded longitudinally; body large, wasp-like, with fore wing
    longitudinally folded
    as in Vespidae, frequently with black and yellow pattern (Figs.B-D) .......  Leucospidae   <Habits>; <Adults> & <Juveniles>   (also Fig. 45) |  
 |