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 



FIG. 23, Larva of Platygaster (after Gai.m) mo. mouth; a, antenna;' 

 kf, hooked feet ; z, toothed process ; Ifg, lateral process ;/", 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 cf Piatygaster in the second stage m t>, mouth ; 

 slkf, oesophagus ; gsae > supra-oesophageal ganglion; I m t muscles; 

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

 27, Larva of Platygasier in the third stage ?;/<?,, mouth ; md, 

 mandibles ; gs a e, supra-oesophageal ganglion; slk, oesophagus; ag~, 

 ducts of the salivary glands ; bnm, ventral nervous sy.tem ; sp, salivary 

 glands; utsl, stomach; im, imaginal discs; tr, tracheae; fk^ fatty 

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

 portion ot intestine ; ao t posterior opening. 



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

 dages having disappeared, and the segments being 



