162 



THE LOCUST 



ganglia. Hence the nervous system consists of pairs of ganglia, united 

 by transverse fusions, the commissures, between the members of a pair, 



Fig. 70. — Growth and differentiation of the locust after hatohinn;. A is 



recently hatched and more highly magnified than the other nymphs, which 



are shown after successive molts until the adult is seen at F. Note the 



appearance of wing-pads in D and E. 



(After A. S. Packard, from H. R. Linville and H. A. Kelly. "General ZoSlogy," copy- 

 right, 1906, by Ginn and Co., reprinted by permission.) 



and by longitudinal connectives, between successive pairs. Nine of the 

 ten ganglionic masses lie along the mid-ventral line close to the exo- 



