412 Dr. T. A. Chapman's Contribution to 



These larvae are figured on Plate LXXXIV, figs. 12, 13 

 and 14, and may be compared with the 1915 larvae on 

 Plate LXXXV. They hardly differ by even the individual 

 variation which is common in the larvae of " Blues," but 

 is perhaps less in A. esclieri than in many other species. 

 The note made on April 27th, 1914, was that they were 

 " rather dark green, darker in the dorsal trough, with a 

 narrow yellow line down dorsal and lateral flanges, there 

 are two pale oblique lines between dorsal flange and 

 spiracles. The honey-gland and position of fans distinct, 

 hair bases black, as Avell as many hairs. But most of the 

 hairs on the lateral flange are white, as well as some on 

 the dorsal flange, chiefly those forming a dorsal crest to 

 each segment, those a little below them being dark." On 

 April 1st : " The larva is remarkable for the very narrow 

 but definite yellow lines, and for the distinctness of the 

 oblique lines that look as if resulting from a thin overlaying 

 layer of white pigment." 



" There are really three whitish oblique marks on the 

 slope of each segment : a middle one, fairly well pronounced, 

 an upper one on the side of the projection of the dorsal 

 flange, and a lower one in which is the spiracle ; the upper 

 and lower are rather patches, and are obUcjue only on their 

 margins apposed to the middle of the three. In most views 

 of the larva, only two of these marks are obvious, the upper 

 or lower being evasive." 



On the 7th April : " It is of a more uniform green, the 

 pale oblique lines are less distinct and the yellow lines less 

 vivid, the hair bases are conspicuously black, but the long 

 hairs of dorsal and lateral flanges are colourless, except a 

 few black ones on last segments." 



Owing to ill-usage due to travelling, though both larvae 

 pupated, the pupae were not healthy and neither progressed 

 further. 



It may be observed that in describing three pale oblique 

 lines, one neglects the alternative of describing two darker 

 lines, viz. the two areas between the paler ones ; the differ- 

 ence arises from choosing to regard the paler or darker areas 

 as the ground-colour. 



These larvae eat into the central growing buds in the 

 heart of the mass of foliage forming the plant of Astragalus 

 exscapiis, its habits in this respect being practically identical 

 with those of P. h/cidas on the same plant. Mr. Main's 

 photograph, Plate LXXXVIII, fig. 25, shows this very 



