376 



latendis^ n. j)rosf/(/iiKi/ls^ s. hasalis^ smallor x. pcda/es. No protho- 

 racic shield. 



Mesotliora.r. S. dorsalis^ s. suprastignialis^ behind whicli a small 

 .s. >ti(hdorsaMs^ s. prostigmalis^ s. hasalis, smaller s. pedales. If 

 a rudiiiieiitary stigma occiirred, I certainly shoiild 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 XIY, fig. 8 of instar ƒ ). Here the rudimontary stigma 

 lies in the intersegmental membrane. 



Metatliora.r = me»of]iorax but the above-mentioned s. subdorsalis 

 is absent. 



Ahdomen 1, 2. ^S'. dorsaJ/!^^ .s. sHhdorsalis, s. ï^Ni/i-axfif/iiKdis^ .s. 

 infr(f,sti(/iii(dis and .S'. postsfd/iindis^ mostly small n. ïx/sa/cs. 

 Sefjm. 3, 4, 5, 6 = 1, but the three 6*. hasales are larger. 



„ 7, 8=1, but one s. basalis. 



„ 9. No s. infrastigmalis, one x. hasalis^ for the rest as 1. 



„ 10 = 1. No anal shield, but on the place which in F. hra.s- 

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

 K. hasales. 



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

 shield of P. brassicae, three small setae arise agreeing 

 with .s. dorsaUs, s. si(hdorsalls and .s\ prostigmalis. Ventral 

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



Instar II. 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 

 rtnnain distinct, they are mucli larger thaii 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 «. basides are conspicuous. 

 Segment 11 is still clearly visible. 



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



The whole body is now covered with uuMU>rous little knobs 

 and setae between which the ])i'iinarv setae are clearly visible. 



