ANATOMY AND PHYSIOLOGY 49 
creases about the bases of the legs may be regarded as incipi- 
ent sutures, produced mechanically by the movements of the 
Fic. 58. 
Ventral aspect of a carabid beetle, Galerita janus. 1, prosternum; 2, proepisternum, 
3, proepimeron; 4, coxal cavity; 5, inflexed side of pronotum; 6, mesosternum; 7, meso- 
episternum; 8, mesoepimeron; 9, metasternum; 10, antecoxal piece; 12, metaepisternum; 
I2, metaepimeron; 173, inflexed side of elytron; a, sternum of an abdominal segment; 
an, antenna; c, coxa; f, femur; /p, labial palpus; md, mandible; mp, maxillary palpus; 
t, trochanter; tb, tibia; ts, tarsus. 
legs. In soft nymphs and larvee, the sclerites do not form until 
the wings develop; and in forms that have nearly or quite lost 
their wings,as Pediculide, Mallophaga, Siphonaptera and some 
5 
