the Life History of Agriades escheri. 413 



well, but the larva goes deeper than shown, practically out 

 .of sight, a circumstance that a photograph could not, of 

 course, demonstrate. 



At the end of July 1914, being at Gavarnie, I succeeded 

 in obtaining eggs of A. escheri var. rondoui. This egg is 

 small, 0'6 mm. across, and 0'22 mm. high. It is remarkable 

 as having a very flat level top, and very perpendicular sides, 

 not curving in an appreciable degree either towards the top 

 surface or the base. The top is quite free from knobs at 

 the intersections of the network except at the absolute 

 margin, thence down the sides the knobs (or pillars) are 

 well developed. A comparison with the eggs of thersites 

 and icarus (Trans. 1914, PI. XXXV) shows that in the flat 

 smooth top and perpendicular sides it differs much from 

 both these, and, if anything, icarus resembles it rather more 

 than thersites does. The egg is photographed, PI. LXXXVII, 

 fig. 23. 



The eggs very obligingly did not hatch until just as I 

 reached home after the prolonged journey from Gavarnie, 

 but began doing so immediately on my arrival (Aug. 9th). 



When newly hatched the larva is very pale yellowish 

 green, almost colourless; the dorsal hairs are very long, 

 forming a high double crest ; the lateral hairs are also very 

 long and conspicuous. As it matures, it acquires a darker 

 dorsal line or band, and a similar dark band a little way 

 above the spiracles. 



In comparing the panoply of hairs, lenticles, etc., there 

 is little to distinguish the larvae of escJieri, thersites and 

 icarus from each other ; escheri and thersites have the long 

 hairs distinctly longer than in icarus — the former about 

 0'28 mm. against 0"21 mm. in icarus. The angular hairs 

 on the prothoracic plate are very close to the posterior hairs 

 in escheri, a little less close in icarus, and quite away towards 

 the angle in thersites. I have not seized any other differ- 

 ences with certainty, but there are probably others. Two 

 specimens showing the hairs, etc., are photographed. Pis. 

 LXXXIX, XC, figs. 26 and 27. 



On Aug. 18th some of the larvae were undergoing their 

 first moult, and practically all had completed it on Aug. 21st. 

 At this date they were 2*2 mm. to 2"5 mm. long, pale trans- 

 lucent green, with darker dorsal line (vessel) and a dark 

 shade along middle of slope. The flange hairs are long, but 

 not proportionally so long as in 1st instar, the dorsal ones 

 form a crest, and the lateral ones rest on the leaf surface 



