'290 NEW YORK STATE. MUSEUM 



B& Mandibles suctorial, without teeth at middle or at base 



c Apex of the abdomen not armed with four hooks. ..Dytiscidae 



CO Apex of the abdomen armed with four hooks G y r i u i d a e 



<«a Tarsi never with more than a single claw; in some species the legs 

 entirely wanting 

 B Cerci present as jointed appendages, in some cases hardly more than 

 a jointed tubercle 

 c Larvae long, wirewormlike; the caudal end of the abdomen strongly 



chitinized; larvae terrestrial Elate ridae 



■cc Larvae soft bodied, not wirewormlike; the caudal end of the abdo- 

 men not more strongly chitinized than the remainder of the body 

 d Eyes in groups of five or six 



e Larvae terrestrial, feeding in fungi Scaphidiidae 



ee Larvae aquatic 



f Eyes in groups of five Hallplidae 



'ff Eyes in groups of six H y d r o p h i 1 i d a e 



dd Eyes in groups of four, two, or none; larvae terrestrial 



e Labrum present, distinct; body frequently lepismoid in form 



S i Ip hi d a e 

 ee Labrum wanting; body not lepismoid in form, the sides sub- 

 parallel 

 t Eyes present, usually in groups of four. .Staphylinidae 



tt Eyes wanting Hlsteridae 



*6 Cerci wanting 



c Larvae without thoracic legs 



d Head broader than the remainder of the body; the body 

 depressed; larvae wood borers 

 e Maxillary palpi with three or four segments; the labial palpi 

 with three segments; eyes frequently present 



CerarQibycidae 

 ee Maxillary palpi with two segments; the labial palpi minute, 



unsegmented; eyes usually wanting Buprestidae 



dd Head not broader than if as broad as the remainder of the body; 

 the body cylindrical; the larvae infesting seeds.. B r u c h i d a e 

 <-c- Larvae with distinct thoracic legs 



d Larvae scarabaeoid, that is, white grub-like, in form 

 e Eyes present 



t Eyes six in number; larvae case-bearers 



Ohrysomelidae 

 ft Eyes two in number; larvae not case-bearers T r o x 



Scarab aeidae 

 ee Eyes wanting, or if present, usually of not more than a single 

 ocellus 



f Antennae three jointed, minute, hardly projecting beyond the 



side of the head; larvae usually small Ptinidae 



ft Antennae two to six jointed, never minute, usually as long 



as, or longer than, the mandibles; larvae usually large 



Lucanidae 



Scarabaeidae 

 da Larvae not scarabaeoid in form 



s e Apex of the abdomen not more strongly chitinized than the 



'■ remainder nor produced into one or two prominent projec- 



tions 



