"~sS3^!3Sr: : ;$ mv 



S^r-sr 



Wi 



'W^^i/'4^f77M^ill ' 

 ^^M^^z^Mmi^ 



m 



"inrnnrn 



KIG. 231. Diagram f the muscles and nerves of the ventral surface of the segments in the larva 

 of Spli-iiix liyuxtri : A, A, recti muscles; 1, 2, ventral recti muscles (1, recti majores; 2, recti 

 rninores) ; 3, ridge giving oriirin to recti muscles of one segment, ar.d insertion to the same of the 

 adjoining segment ; 4, ridge for attachment of muscle ; ft, retractor ventricnli, connecting the mid- 

 intestine with the outer integument of the body. Ji, >. first oblique. 7, second oblique,- '.', Hi, 

 third oblique, muscles; 11, fourth oblique, 12, third rectns, ]'>>, fifth oblique, 14. triangnlaris, 

 muscle; !.">, iraii-ver^u-i medius ; 10, transverse ridge ; 17, t.ransversi abdominales ; 18, abdomlnalea 

 anteriores ; 19, 20, abdorninales laterales, some (2(1) longer than others; 21, ohliquus |ioterii>r; 22, 

 postero-lateralea oliliqui; 28, transver>u> lateralis ; 24, second trnnsv. i-su-. latei-:ili.s ; 2 ft, retractor 

 spiraculi, or constrictor of the ^piracies, attached by a long tendon (2ti) ; 27, retractor valvnl;e. 



Nerves: n, ganglion. <. transverse nerves, of wbich j> is the first, q the second, / Ihe third, 

 and x the fourth branch : /, the main trunk, which crosses the great longitudinal trachea, receives a 

 filament from the transverse nerve (n), and divides into two branches (/) ; some of these branches 

 form a small plexus (n) ; the nerve t divides in two divisions ( /> and rl. The second division ends 

 in ir and a 1 ; the branch <j divides into ij and z. For other explanations, see Newport, art. Insecta. 

 After Newport. 



212 



