NO. 



INSECT ABDOMEN SNODGRASS 



55 



lying in the anterior half of each segment internal to the lateral 

 tracheal trunk (LTra). Outside of these muscles, and external to the 

 tracheal trunk, is a wide band of longitudinal paratergal fibers ( p) of 



DTra 



LTra 



Fig. 22. — Musculature of right half of two consecutive abdominal segments 

 of Tipula abdom'malis larva. 



di, internal dorsal muscles ; li, internal lateral muscles distributed in anterior 

 half of segment internal to lateral tracheal trunk {LTra) ; p, band of paratergal 

 fibers ; 7'/, internal ventral muscles. 



Fig. 23. — Musculature of the body wall of the larva of a cyclorrhaphous 

 dipteron, Rhagolctis pomonella. 



A, musculature of the thoracic and first abdominal segments, seen from above, 

 with pharynx and connected parts turned forward. B, musculature of right 

 half of two consecutive abdominal segments. 



ASp, anterior spiracle ; fs, frontal sacs ; Ht, heart ; Ic, external lateral muscles ; 

 li, internal lateral muscles; Phy. pharynx, turned forward; 7v, longitudinal 

 bands of internal ventral muscles. 



segmental length, but attached on the median intrasegmental folds of 

 the dorsum. The numerous external laterals lie against the body wall 

 external to the paratergal fibers. 



