664 



TEXT-BOOK OF ENTOMOLOGY 



we see the coxa, femur, tibia, and tarsus of the perfect insect, the 

 tarsal joints not yet being indicated. 



The wing-buds (a 1 , a 2 ) appear at the same time as those of the 

 legs, as racket-shaped masses of small cells situated directly behind 



ant 



T)f. 



ur.t - 



FIG. 618. 



Fio. 619. 



FIG. 618. Older Encyrtus larva, lateral view, showing the buds of the antennae (ant), legs, 

 and wings (w, to') : oe, oesophagus ; q 1 , q*, q 3 , buds of the genital armature ; o, rudiment of the 

 sexual gland (ovary or testis) ; ur. t, urinary tube ; xt, stomach ; i, intestine (rectum) ; n, ventral 

 nervous cord ; r, rectum ; sp l -sp 9 , spiracles. 



FIG. 619. A still older larva, ready to transform. The imaginal buds of the antennae (/), eyes, 

 wings (a 1 , 2 ), and legs have become elongated : ch, chitinous arch ; b, mouth ; o, eye-bud ; g, brain ; 

 e, stomach ; te, rudiment of the sexual glands (either the ovary or testis). This aud Figs. 617 and 

 618, after Bugnion. 



the 1st and 2d pair of stigmata, in contact with the tissue ensheathed 

 by the corresponding tracheal vesicle (Fig. 618). Afterwards they 

 have exactly the form of those of the Lepidoptera (Fig. 619). 



The proliferation of the hypodermis is not limited to the thorax, 

 but takes place at corresponding points in the first seven abdominal 



