LARVAL FORMS OF COLEOPTERA 



IS. Ventral inontlii)arts retracted.'" ([Mandibular molar part usu- 

 ally present) CiicKJoidca (p. Xi) and section 23 (p. 15) 



Ventral mouthparts protracted. (Head capsule ventrally with 

 a broad transverse bridge formed completely or mainly by 

 the large hypostomata ; mandible without molar part, often 

 of the gouge-shaped eoelate type; legs short or absent.) 



Cerainhijcoidea (p. 60) 



19. Ilypopharyngeal sclerome absent; mandible without a real 



molar structure 20 



Hj'popharyngeal .sclerome present; mandible of the raastico- 

 morphic type with veritable molar structure. (Mentum and 

 submentnm well separated; head nutant) 23 



20. Xintli abdominal tergum armed with a pair of urogomphi or an 



unpaired spi]ie. (Tenth abdominal segment without a pair 

 of large lobes separated by median longitudinal groove ; legs 

 short, soft, but jointed ; terminal joint not claw-shaped ; frons 



short and transverse) Mordelloidea (p. 60) 



Ninth abdominal tergum without a pair of urogomphi or an un- 

 paired spine'*' 21 



21. Tenth abdominal segment in front of anus provided with a pair 



of cushioned and adjacent lobes separated by a median, lon- 

 gitudinal groove often marked at the anterior end by a small, 

 transverse sclerome. (Frons indistinct, short, and trans- 

 verse ; frontal sutures faint or absent ; epicranial suture pres- 

 ent and long, or absent through complete fusion of epicranial 

 halves; mentum laterally free and separated from submen- 

 tum, except in Caenocara ; legs four- or five-jointed, usually 

 with rather long, setose, distally pointed, and hard tarsun- 

 gulus, except in Caenocara where legs are vestigial, two- 

 jointed, and soft) (pi. 101) BostricJwidea (p. 62) 



Tenth abdominal segment in front of anus without a pair of 

 soft, oval lobes separated by a longitudinal groove 22 



22. Hypopharyngeal bracon absent. (Frons usually distinct with 



converging frontal sutures; usually with distinct, four- or 



^" In some forms, as Phalacridae, Laemophloeidae, and possibly 

 Catogenidae, the ventral mouthparts are apparently protracted as a 

 result of elimination of cardines, or fusion of cardines, submentum, 

 and gular area into a large common subfaeial region (pis. 31, 32- 

 34). 



^® In exception, paired urogomphi are present in the first larval 

 instar of Lyctus, and an unpaired terminal spine is found on the 

 mintli abdominal segment of the first instar of the Scohicia larva, 

 but both of the larvae possess in front of the anus a pair of adjacent 

 lobes separated by a longitudinal groove (pis. 101, 102). 



14 



