lie 



Prothorax. S. dorsalis, s. subdorsalis, s. suprastigmaUs^ s. dorso- 

 latemlis, s. prostigmalis, s. basalis, smaller s. ped(des. No protho- 

 racic shield. 



Mesotkorax. S. dorsalis, s. suprastigmalis, behind which a small 

 .<?. suhdorsalis, s. prostigmalis, s. hasalis, smaller s. pedcdes. If 

 a rudimentary stigma occurred, I certainly should have found 

 it, as the tracheae were very distinct. The two lateral main-stems 

 are connected with each other near the caudal edge of the seg- 

 ment (see Plate V, fig. 8 of instar /). Here the rudimentary stigma 

 lies in the intersegmental membrane. 



Metathorax ^ mesothorax but tlie above-mentioned s. subdorsalis 

 is absent. 



Abdomen 1, 2. S. dorsalis^ 8. subdorsalis, s. suprastigmalis, s. 

 infrdstignmlis and s. poststigmalis, mostly small s^basales. 

 Segm. 3, 4, 5, 6 = 1, but the three s. busales are larger. 



J, 7, 8 = 1, but one s. hasalis. 



y, 9. No 8. infrastigmalis, one s. hasalis, for the rest as 1. 



„ 10 = 1. No anal shield, but on the place which in P. bras- 

 sicae agrees with this shield, three setae are found. Two 

 8. basales. 



„ 11. Behind the three setae of 10, on the area of the anal 

 shield of P. hrassicae, three small setae arise agreeing 

 with s. dorsalis, s. subdorsalis and s. prostigmalis. Ventral 

 of these is a large one, which I consider to be s. hasalis. 



Instar //. Length 6 mm. Duration 4 days. 



Between the primary setae we find many smaller ones and 

 setae without a tuberculum arise on the leg. The primary ones 

 remain distinct, they are much larger than the secondary ones, 

 the setae are longer and thicker. 



Of the secondary setae the vertical rows along the oral and 

 caudal edges of the segment and many s. basales are conspicuous. 

 Segment 11 is still clearly visible. 



Instar ///. Length 9 mm. Duration 8 days. 



The whole body is now covered with numerous little knobs 

 and setae between which the primary setae are clearly visible. 



