26 C. SASAKI. 



Besides these bundles mentioned above, there are provided three 

 pairs of short but broad bundles at the base of the jaw. Two ( PL 

 IV, fig. 15 f) of these have their distal end attached to the dorsal wall 

 of the anterior segments, while the remaining one arises from tlieir 

 ventral wall. These make the jaw project outward or retract inward. 



Dorsally just between the two hemispheres of the supera-œsopha- 

 ffeal ganjrlion which will be described later on, there is placed an oval 

 muscular ring ( Fl. F, fig. 3j) which is anteriorly supported by two 

 air tubes ( PL V; fig. 3 k) and posteriorly by a nmscular string ( PL V, 

 fig. 3 I) arising from the posterior portion of the proventriculus ( PL V, 

 fig.3pr). Through the ring passes the delicate dorsal vessel (PL V, 

 fig. 3 he). 



The respiratory system consists of two long air-tubes or tracheœ 

 ( PL V, fig. 1 ) passing lengthwise on either side of the median line of 

 the body. From the main trunk of the tracheœ ( PL T, fig. la) are 

 given out smaller branches in each segment, and hne ramifications of 

 these are distributed to all internal organs. The posterior broader end 

 of the two main trunks opens separately into a spiracle ( 2V. V., fig- Ih) 

 which is situated at the truncated end of the last segment of the 

 maggot. The spiracle (P/. V, fig. 2 a) is protected by an oval chitinous 

 disc colored dark brown, and marked with several wav}' ridges, as well 

 as with a few strong radial lines. Just inside the spiracle, a single large 

 branch (PL V, fig. 1 c) is given out, whose smaller branches are mostly 

 distributed over the intestinal canal. The anterior end of the main 

 tracheal trunks (PL V, fig. 3a') is connected with the five small 

 spiracles (PL IV, fig. 10 a) on the second segment of the maggot 

 On the third segment, these two trunks are connected with each other 

 by a fine transverse air-tube ( PL V, fig. 3 a). The four smaller 

 branches given out at about the same portion of the trunks bsar each 

 an oval disc on its free end ( PL V, fig. 3 h, c, d, e ) What tliese discs 



