ANATOMY \\l> I'li 



47 



small ingrowths, occurring -onietinir, in ,ill tin. ic segments, 



though usually ;dent in the prothorax. 'I ;e occur in each 



thora' -i pair of OlMpU D00I pi- 



remain separate or else unite mon 

 i he ventral nerve cord. 



an 



FIG. 60. Ventral aspect of a carabid beetle, Galerita janus. i, prosternum; 2, proepi- 

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

 mesoepisternum; 8, mesoepimeron; 9, metasternum ; 10, antecoxal piece; n, metaepi- 

 sternum; 12, metaepimeron; 13, inflexed side of elytron; a, sternum of an abdominal seg- 

 ment; an, antenna; c, coxa; /, femur; lp, labial palpus; md, mandible; mp, maxillary pal- 

 pus; /, trochanter; tb, tibia; ts, tarsus. 



These endoskeletal processes serve chiefly for the origin of muscles 

 concerned with the wings or legs, and are absent in such wingless forms 

 as Thysanura, Pediculidae and Mallophaga. 



Some ambiguity attends the use of these terms. Thus some writers 



