ON THE ORIGIN AND 



[CHAP. 



the hypodermis and the muscles. This larva, as will 

 be seen by the figure, resembles a barrel or egg in 



ao 



FIG. 23, Larva of Platygaster (after Ganin) mo, mouth; a, antenna; 

 kf, hooked feet ; z, toothed process ; Ifg, lateral process ;f, branches 

 of the tail. 24, Larva cf another species of Platygaster. The letters in- 

 dicate the same parts as in the preceding figure. 25, Larva of a third 

 species of Platygaster. The letters indicate the same parts as in the pre- 

 ceding figures. 26, Larva of Platygaster in the secorid stage m v, mouth ; 

 s-lkf, oesophagus ; gsa e, supra-oesophageal ganglion; I m, muscles; 

 bsm, nervous system ; ga,gh< rudiments of the reproductive glands. 

 27, Larva of Platygaster in the third stage mo, mouth ; md, 

 mandibles ; g'sae, supra-ossophageal ganglion; slk, oesophagus; ag, 

 ducts of the salivary glands ; bnm, ventral nervous system ; sp, salivary 

 glands; in si, stomach; im, imaginal discs; tr, trachese ; fk, fatty 

 tissue ; ed, intestine ; ga, rudiments ot reproductive organs ; ew, wider 

 porcion of intestine ; a o, posterior opening. 



form, and is '870 mm. in length, the external appen- 

 dages having disappeared, and the segments being 



