III.] 



METAMORPHOSES OF INSECTS. 



43 



without thoracic appendages ; in the Orthoptera, on 

 the contrary, the legs are fully developed before the 

 young animal quits the egg. 



Prof. Owen, 1 indeed, goes so far as to say that the 

 Orthoptera and other Homomorphous insects are, "at 

 one stage of their development, apodal and acephalous 

 larvse, like the maggot of the fly ; but instead of quit- 

 ting the egg in this stage, they are quickly transformed 

 into another, in which the head and rudimental 

 thoracic feet are developed to the degree which cha- 

 racterizes the hexapod larvae of the Carabi and 

 Petalocera." 



I quite believe that this may have been true of 

 such larvae at an early geological period, but the 

 fact now appears to be, so far at least as can be 



3o 31 



FIG. 30, Egg of Phryganea (Mystacides) A 1 , mandibular segment ; C 1 

 to C 5 , maxillary, labial, and three thoracic segments ; D, abdomen 

 (after Zaddach). 31, Egg of Phryganea somewhat more advanced b t 

 mandibles ; c, maxilla? ; cfs, rudiments of the three pairs of legs. 



judged from the observations yet recorded, that the 

 legs of those larvse which leave the egg with these 

 appendages generally make their appearance before 

 the body-walls have closed, or the internal organs 



Lectures on the Anatomy, &c. of the Invertebrate Animals. 



