The musculature causing the undulating, creeping and other movements 

 of the abdomen (segments 2—8) has the same arrangement; Figure 24 shows 

 34 the above dorsal and ventral longitudinal muscles in segments 2-4 and part 

 of the bundles of the dorsoventral annular musculature compressing the 

 segments and extending the abdomen; the deeper muscle layers are shown 

 in segments 5 — 8. In addition to the longitudinal muscles present in all 

 other segments, the 9th segment contains muscles moving the anal legs 

 (Figure 25); the longitudinal ventral muscle has a large branch attached 

 to the sclerite "c"; this is the flexor of the claw; two small adductors 

 extend from the claw to sclerite "b", raising the claw, and also a lateral 

 adductor of the claw. Figure 26 shows the alar muscles extending the 

 longitudinal blood vessel. 



Intestine and excretory organs. The intestinal tract is not 

 only internal, but includes also the mouth appendages and the preoral cavity. 

 The intestine extends from the mouth to the anus; it is primitive in the 

 larvae of caddis flies and forms (both in phytophagous and predatory species) 

 a straight tube; it is almost as long as the body. It is divided into stomo- 

 daeum, mesenteron and proctodaeum (Figure 27). 



(35; 



prov 



-prov 



FIGURE 27. General view of the intestine (after Branch). Hydropsy chodes sp., 

 lateral (A); Phryganea sp., ventral (B). 



pr — proctodaeum, cf — cardiac fold, mt — malpighian tubules, es — esophagus, 

 prov — proventriculus, r— rectum, oc — oral cavity, mes — mesenteron, si — small 

 intestine, li — large intestine. 



30 



