LARVAL FOR^rs OF COLEOPTERA 



liMs Ix'i'ii iiicliidcd ill oui- Hydrophiloidea (p. 31) and the Cory- 

 l()l)liida(' ])lci('('d ill the Cucnjoidea near the Phalaeridae (p. 36) 

 and Sniicripidae (p.36). The Micropeplidae is listed in the Staphy- 

 lin()i(U'a aec()rdiii<i' to an incomplete deseri])tion by Lubbock (Trans. 

 Ent. Soc. London, 1868, p. 275, one plate) but the larva may not 

 belong in this series at all. 



Key to Families and Subfamilies 



1. ]\Iaiulibh' with a. usually large, asperate or tuberculate molar 



part " 2 



Mandible without asperate or tuberculate molar part, usually 



without molar part 7 



Lepfinid association: 



2. Tenth abdominal segment provided with a pair of recurved 



hooks Limnehiidae {Ochihehins, Hydraena, 



and Li))inehius) (pi. 8 A-L) 

 Tenth abdominal segment without terminal hooks but some- 

 times with a pair of long setae 3 



3. Spiracles absent ; balloonlike appendices on prothorax, first and 



eighth abdominal segments; antenna very short and two- 

 jointed Hi)droscaphidae (pi. 9 A-F) 



Spiracles present ; no balloonlike appendices ; antenna three- 

 jointed 4 



4. Apex of mandible multiserrate ; urogomphi short, one-jointed. 



Ptiliidae (Nossidium) (pi. 10 F-L) 

 Apex of mandible bifid or trifid; urogomphi two-jointed, last 

 joint often multiannulate 5 



5. Mandible with vestigial retinaculum (r). 



Leptinidae (pi. 10 A-E) 

 Mandible witli distinct retinaculum (r), or prostheca (Im),^^ 

 or both 6 



6. Asperities on molar structure covering entire ventral surface, 



irregularly arranged; paraglossae as long as ligula. 



Anisoiomidae-Liodinae^'' (pi. 11 A, 



Asperities on molar structure arranged in fine transverse 

 (often few) rows; paraglossae absent or shorter than ligula. 

 Anisofomidae - Cholevinae'^' (pi. 11 

 C-M) 



7. Mala and stipes fused 8 



Mala jointlike, movable 23 



^^ Except in Aphaohins, belonging to the Anisotomidae-Cliole- 

 vinae but verv similar to the Leptinidae. (L. Weber, Allg. Ztsch. 

 f. Ent. vol. 7," 1902). 



26 



