a2. Cardo of a:smngle pieces es ee 33 
Cardo of: 2. pieces: 210 2.4 See ed eee on 
33. Ninth abdominal segment bearing spines, latter with pit 
between. Mareins |... ee ee ee ee 34 
Ninth abdominal segment with or without spines, when 
present pit absent between MAaLgins oe 35 
64. Terminal spines biturcate- =.= ee Othniidae 
Terminal spines ‘srmpley 2s. eee ee Colydiidae 
35. Antenna inserted close to mouth frame; apices of pro- 
thoraciczcoxae usually conticueus-. | 36 
Antenna inserted some distance from mouth frame; apices 
of prothoracic coxae separated 0... Lagriidae 
36. Back of mandibles opposite cutting edge, sharp; body 
cylindrical; terminal segment without spines and usu- 
ally bluntly soundedts2) 2 ee ee Alleculidae 
Back of mandibles rounded; body rarely cylindrical; 
terminal segment often armed .......... Tenebrionidae 
37. Second to 5th abdominal segments with venter bearing 
asperatesampullae..= eo ee ee Oedemeridae 
Abdominal segments normal, without ampullae . 38 | 
38. Ninth abdominal venter bearing a pair of conical points ) 
Melandryidae | 
Ninth abdominal venter simple, without such points 39 
39. Submentum and gula fused and heavily chitinized; ter- 
minal segment with soft, white spines ....Cephaloidae 
40. Hypopharynx chitinized; mandibles with a molar or 
erinding ‘structure (225-200 See eee Al 
Hypopharynx fleshy; mandibles without a grinding 
structure: 428.40 A eee ee eo ae eee 42 
41. Legs well developed, 5-jointed; 9th abdominal segment 
armed;-body ‘elongate 2.25522 fe Lymexylonidae 
Legs weak, 9th abdminal segment unarmed; body 
curved; larvae in bark or wood beneath the sporo- 
phores, of :woody fungi (= eee _ Anthribidae 
42. Ninth abdominal segment ending in a single truncate 
spine:or in paired spines 2... | == Mordellidae 
Ninth abdominal segment unarmed, except some first- 
instar ‘larvae’ ee ee. eee 43 ; 
43. Tenth abdominal segment provided with a pair of cush- . 
ioned lobes (not anal lobes) separated by a median . 
suture; fleshy, curved hairy forms, usually with slen- 
der 4- or 5-jointed legs; wood-boring forms 
Bostrichidae, Ptinidae 
Tenth abdominal segment normal] ...... 44 
44, Elongate buprestid-like larvae in the roots of hickory 
CFEES> Var, i RO. Nie Peers? ton (Cera eer 
Form otherwise 45 
45. Legs vestigial, 2- jointed, cylindrical, fleshy, wood-boring 
form, with chitinous asperities on prothor ax and ab- 
dominal terga Brentidae 
Legs 4- or 5-jointed except occasionally absent in some 
leaf-mining forms; maxillary mala often divided; hy- 
popharyngeal bracon absent 46 
Legs wanting; mala always simple; bracon present 47 
116 
