64 



B('ll(((lo)n\n Lfnf -Miner 



so that it is of interest to find that the larvae can be quite easily dis- 

 tinguished as also the puparia. It is almost impossible to find any 

 distinguishing feature in the eggs of the three species. In each case 

 the chorion has the same hexagonal pattern, but generally the sculp- 

 turing is more delicate on the eggs of hyoscyami (PL I, fig. 1) than on 

 those of the other two, bicolor and nigritarsis. We realise however 

 that this character is insignificant and unimportant, inclined as it is to 

 much variation. 



The following table is a resume of the distinctive characters of the 

 larvae, by which the three species may be separated and recognised 

 in the larval condition : 



Larval Cliaracter 

 Integument 



Colour . . 



Length . . 

 Anterior spiracles 



Posterior spiracles 



Tubercles of l'Ui)iialc 

 Segment 



Antennae and Sense- 

 organs 



P. hyoscyami 



Wrinkled 



No post-cephalic 



ventral tubercle 



(" foot ") 



P. bicolor 



P. nigritarsis 



Smooth, tough Smooth 



Post-cephalic ven- Absent 

 tral tubercle pre- 

 sent (fig. 8, a.}).) 



Dull, yellowish- Yellowish, iridescent Dull white 

 white 



8 mm. 10 ram. 9'5 mm. 



81obes(Pl. 1, tig. 5) 25-30 lobes (PI. I, lG-25 lobes 



fig. 11) 



Palmate Ellipsoidal Semi-ellipsoidal 



Sub-sessile (PI. 

 fig- 3, p.sp.) 



I. 



Porrect, prominent 

 stigmatic projec- 

 tion, 2-segmented 

 (PI. I, figs. 8, 9, 

 p.sp.) 

 3 apertures broadly 3 apertures, elongate 

 oval, equidistant, oval, acumuiate ; 

 of equal size (PI. equidistant (PI. 1, 

 I, fig. 3) fig. !)) 



7 pairs (PI. I, lig. 3) 3 ])airs — adanal 



lobes (PI. I, fig. <») 



Sense-organs not so vSense-organs almost 



widely separat(! as adjacent, antennae 



theanteiuiae (PI. I. separate 

 fig. 4) 



Slightly projecting 

 (Fl I, &g.V2, p.sp.) 



3 apertures, elongate 

 oval, the largest 

 dorsal, separate ; 

 twice tlie distance 

 between tiie dorsal 

 and the median as 

 between tile median 

 and the ventral 

 (PI. J. lig. 12) 



() pairs, of wiiieli 2a 

 and 3rt placed pos- 

 teriorly (Pl.I,fig. 12) 



Sense-organs have 

 same distance apart 

 as antennae ; situ- 

 ated nearer the an- 

 tennae than is the 

 case in bicolor 



Nathan Banks (1912) describes and figures only twelve lobes to the 

 prothoracic spiracles of bicolor, but careful examination of bona-Jide 

 specimens has always shown the presence of at least twenty-five lobes. 



