LARVAL FORMS OF COLEOPTERA 



Ninth abdominal segment without dorsal prongs in front of 



nrogomphi 12 



12. Body dorsoventrally flattened ; ninth abdominal tergite either 

 with a pair of well-separated nrogomphi or a single bira- 

 mous process (pis. S-t G. 85 0) ; tenth abdominal segment 

 more or less produced and often bearing hooks or other 



armature Elateridae - Pxirophorinae (pis. 



84 A-S, 85 A-R, 86 A-E) 

 Body more or less cylindrical ; ninth abdominal tergite with- 

 out nrogomphi ; tenth abdominal segment small, not pro- 

 duced, and never bearing armature 



Elaferidae - Elaferinae (pi. 86 

 F-U) 



M. SCARABAEOIDEA 



Key to Families axd Subfamilies 



1. Stridulating organs present on second and third pairs of legs 



(pi. 87 E, I) ; abdominal terga not plicate. (Lacinia and 



galea separate (pi. 87 B, F)) 2 



Stridulating organs absent, or present as teeth on dorsal inner 

 margin of maxillary stipites, usually working against a 

 granulate or striped area on ventral side of mandibles; (pi. 

 88 M. P) abdominal terga plicate. (Lacinia and galea 

 separate or fused (pi. 87 V)) 7 



2. xVnus longitudinal between two large, oval, often sclerotized 



pads at end of body (pi. 87 J) ; third pair of legs normal 3 



Anus transverse ; end of body different ; third pair of legs re- 

 duced and much shorter than second pair 6 



3. Dorsal shield of prothorax anteriorly on each side with a 



triangular, forwai'dly directed process 



Lucanidae - Sinodendrinae (pi. 

 87 I, J) 

 Dorsal shield of prothorax Avithout process 4 



4. Left mandible in front of molar part with two (Nicagns) or 



three teeth {Ceruchus) Lucanidae- Aesalinae (pi. 87 K) 



Left mandible in front of molar part with four or five teeth .5 



5. Tenth abdominal segment slightly hairy dorsally; claw some- 



what curved; left mandible either with four (Platijcerus) or 



five teeth (Dorcus) Lucanidae-Dorcinae 



Tenth abdominal segment hairj- dorsally ; claw strong and 

 straight ; left mandible with five teeth 



Lucanidae - Lucaninae (pi. 87 

 A-D) 



North Carolina, probably belongs in or near the Oestodinae but it 

 also possesses characters, present in the ventral moutliparts and 

 the sternal region of prothorax, which approach it to the Throscidae 

 (pi. 81E-G). 



51 



