10. 
dele: 
12. 
13. 
14. 
ily 
16. 
ie 
114 
Hypopharynx and ligula strongly chitanized; soft-bodied, 
wood-boringe forms, 422. ee ee 
Hypopharynx soft; ligula soft or vestigial; mandibles 
falcitorm:, fitteds fom eas in cae ee eee 
Ninth abdominal segment armed with 1 or 2 chitinous proc- 
esses; mandible with large grinding molar structure .... 
Ninth abdominal segment unarmed; mandibles of grasp- 
ING ty Pe. ee ee eee eee eee wee Rhysodidae 
Ninth abdominal segment dorsally produced into a 
straight: pROCeSS .22 ee eee Cupesidae 
Ninth abdominal segment bearing a dorsal and ventral 
process, curved toward each other .......... Micromalthidae 
Body fusiform, usually developed for active motion, no 
abdominalhooks) <2). 3. eae ent en ere Carabidae 
Body fleshy digitate; dorsal surface of 5th abdominal 
segment bearing 2 or 3 pairs of hooks; larvae living in 
earthen burrowsoin the-soili eee eee Cicindelidae 
Ninth abdominal segment bearing 1- or 2-jointed, mov- 
able appendages or cerci- 2-2) ee 
Cerci-rigid: or absent. 0) ae ee eee 
Mandibles of the grasping type without a grinding or 
molar structure at base; gula reduced or represented 
by a line, the sides of head meeting ventrally ................ 
Mandibles of the biting type; gula present ........ Silphidae 
Spiracles bifore; cardo and stipites fused .......... Histeridae 
Spiracles annular; stipites articulate on cardo 
Staphylinidae 
Curved, grublike larvae with strong well-developed legs; 
mandible with a large grinding structure; lacinia and 
galea usually distinctly divided; spiracles usually crib- 
rif orm: NGO! CORCL) Oh re ae ee een nee 
Form variable and not having the above combination of 
CHAP ACTER Sis ee Ora ee Se ence en he een a eter 
Gula present separating submentum from prothoracic 
skins; laciniaeZ-joOmmtedip se eee ees Byrrhidae 
Gula absent; submentum and prothorax continues in 
a soft skinlike connection 0... Lamellicornia 
Gular region or a median gular suture present ............ 
Gular region fleshy, i.e., submentum and presternum 
of prothorax continuous in a skinlike connection ....... 
Parasitic; soft-bodied, swollen larvae with head and 
body white; mandible without molar structure | 
Not parasitic; head and body normally chitinized __. 
Mouth parts peouracheGa ee Cucujidae 
Mouth pantsenetracted te ee ..... Colydiidae 
Labrum absent or fused with clypeus into a nasale 
Labrum distinct. eee 
Head structures reduced and specialized; body usually 
much depressed; wood borers, the larvae cutting gal- 
leries across the grain of the wood oer cee 7 | 
Head structures not so modified ...............................Klateridae 
Legs short, 5-jointed. .................... dais pope NFOSCICae 
Legsrabpsent. or vestigial... eee Eucemidae 
Maxillary articulating area indistinct ......... , 
10 
Ht 
12 
40 
13 
14 
15 
seg 
16 
18 
