ANATOMY AND PHYSIOLOGY 



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creases about the bases of the legs may be regarded as incipi- 

 ent sutures, produced mechanically by the movements of the 



Ventral aspect of a carabid beetle, Galerita janus. i, prosternum; 2, proepisternum, 

 3, proepimeron ; 4, coxal cavity; 5, inflexed side of pronotum; 6, mesosternum; 7, meso- 

 episternum; 8, mesoepimeron ; p, metasternum ; 10, antecoxal piece; n, metaepisternum ; 

 12, metaepimeron ; 73, inflexed side of elytron; a, sternum of an abdominal segment; 

 an, antenna; c, coxa; f, femur; Ip, labial palpus; md, mandible; mp, maxillary palpus; 

 t, trochanter; tb, tibia; ts, tarsus. 



legs. In soft nymphs and larvae, the sclerites do not form until 

 the wings develop ; and in forms that have nearly or quite lost 

 their wings, as Pediculidae, Mallophaga, Siphonaptera and some 

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