LARVAL FORMS OF COLEOPTERA 



L. ELATEROIDEA 



Key to Fa]milies and Subfamilies 



Labnim distinct. (Headcapsule and mouthparts neither re- 

 duced nor abnormal) 2 



Labriim and clypeiis fused, forming a nasale immovably united 



with frons. (Spiracles biforous) 6 



Spiracles biforous; ninth abdominal segment opercular; body 

 cylindrical and strongly sclerotized; legs distinct 



Rkipiceridae (Zenoa) (pi. 79 

 A-H) 

 Spiracles cribriform; ninth abdominal segment well-developed 

 and not opercular ; body fleshy, Avith a dorsal and a ventral 

 plate of the same shape, more or less covering a flattened 

 and enlarged prothorax ; legs absent or verj^ much reduced. 

 ( Chordotonal organs often very distinctly indicated laterally 



on many of the segments by a deep auditory pit) 3 



Prothorax only slightly broader or even slightly narrower than 

 the first abdominal segments; larva either spindle-shaped 

 (Pachyschelus), or wedge-shaped and with transverse anus 

 (Braciiys and the european Trachys). (Leaf miners) 



Bupresiidae-Pachyschelinae (pi. 

 80A-D) 

 Prothorax distinctly broader than the first abdominal seg- 

 ments ; larva clublike and somewhat flattened ; anus a longi- 

 tudinal slit 4 



Tenth adbominal segment large, terminating with a pair of 

 pointed and hard prolongations 



Bupresiidae-Agrilinae (Agrihis, 

 Eupristocerus) (pi. 80 E) 

 Tenth abdominal segment rounded, often with a pair of soft 



warts but Avithout strong, hard prolongations 5 



Dorsal plate of prothorax with or without asperities, medianly 

 marked with an inverted Y- or V-shaped groove 



Bupre st idae-B u presf inae (Chal- 

 cophorini, Biipresfini, Chry- 

 sohothrini) (pi. 80 F-K) 

 Dorsal plate of prothorax without asperities and marked 

 medianly with an I-shaped groove 



Bupresfidae-PoJycestinae {Poly- 



cesfini, Thrincopygini) 



Headcapsule and mouthparts very much reduced or extremely 



specialized. (Prothorax ventrally, or both dorsally and 



ventrally, with a pair of separate, rod-shaped, longitudinal 



scleromes often of a form suggesting a figure 7 or a letter 



. T) 7 



49 



