LARVAL FORMS OF COLEOPTERA 



apex and retinaculum entire and incurved ; retinaculum 

 short and broad ; a fleshy lobe present behind mola ; body- 

 cylindrical) LanguHidae-Langurunae** (pi. 



28 H-J, L, N) 

 Mandible witli two apical teeth. (Cutting edge between apex 

 and retinaculum with one or many projections; body fusi- 

 form) 10 



10. Cutting edge of mandible behind the apical teeth with a single 



rounded projection; retinaculum short and broad. (Uro- 



gomphi present) Languriidae-Clacloxeninae (pi. 



28 K, M, 0-Q) 

 Cutting edge of mandible behind the apical teeth multiserrate ; 

 retinaculum long, slender and brittle. (With or without 

 urogomplii Cryptophagidae (pi. 29 A-U) 



11. Urogomplii absent. (Ninth abdominal segment small or very 



small; tenth segment conical and often long) 12 



Urogomplii present 13 



12. Antenna with second joint large and clavate ; apical joint 



minute Silvanidae-Silvaninae*^ (pi. 30 



A- J) 

 Antenna Avith three Avell-developed normal segments 



Silvanidae - Telephaninae'^^ (pi. 

 30 K-0) 



13. Tenth abdominal segment long and conical 



Cucujidae - Bronfinae (= Hylio- 

 tinaeY' (pi. 31 L) 

 Tenth abdominal segment short and wart-shaped 



Ciicujidae-Cucujinae*^ (pi. 31 

 A-F) 



14. Mentum with only apex free, or small, or indistinct by fusion 



with other areas. (Exceptionally, in the Sphindidae, mentum 

 free to base and distinct, but appearing together with a 

 mandible provided with retinaculum and a ninth abdominal 



segment without urogomplii) 15 



Mentum with more than apex free, often free to base, ahvays 

 well developed and distinct. (Mandible, except in genus 

 Deretaphriis, without retinaculum; urogomplii usually 

 present) 35 



15. Head swollen laterally, and much broader than thorax; eardo 



of normal shape and position ; maxillary articulating area 

 round and well developed ; hypostomal inner margin concave 

 between fossa for mandible and posterior end of cardo 



Prosfomidae'' (pi. 33 A-H) 

 Different development of some, or all, of the four characters 16 



16. Maxillae appearing protracted in front of the mandibular 

 '** The famih^ Languriidae is usually considered as a subfamily 



of the Erotylidae. See also footnote^^. 



34 



