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The mature larva and pupa of    Graptus   triguttatus   triguttatus    and the mature larva of    Peritelus   sphaeroides    are described for the first time. The larvae of    Philopedon   plagiatum    and    Tanymecus   palliatus    are re-described. Five larval instars were determined in    Tanymecus   , thereby correcting doubtful data in the literature. The relationship between larval growth, number of larval instars, head width of the mature larva, and the adult weevil is explained using the example of    Tanymecus   . The nearly constant ratio of subsequent larval instars in head width ratio, termed “growth factor” and derived from Dyar’s ratio, is used for the determination of larval instars. Larval collecting and breeding data are discussed in relation to their significance for the clarification of life-cycles.

zookeys

Descriptions of immature stages of four species of the genera    Graptus   ,    Peritelus   ,    Philopedon   , and    Tanymecus    and larval instar determination in    Tanymecus    (  Coleoptera  ,   Curculionidae  ,   Entiminae  )