THE APODIDyE 



PART I 



formed by the bending of the head, but the attach- 

 ments of the muscles also spread out over a large 

 surface. Further, partly from having no segments to 

 move, and partly on account of the growth of the 

 frontal ridge, they apparently pass through one or two 

 segments without beins^ attached at all. 



o o 



vm 



md 



FIG. 13. Diagram to show the musculature of the head. Lettering as in Fig. 12. 



nui, mandibles ; z, intestine. 



The ventral muscle bands of the Apodidae, on the 

 other hand, on reaching the sharp bend of the head 

 near the lip, are all clumped together into an ap- 

 parently shapeless sinewy mass ; the muscle bands 



