the Life History of Polyommatus eros. 477 



greater between them at the posterior than at the anterior border 

 of the segments, they cease abruptly with the 6th abdominal seg- 

 ment. There are two faint oblique yellow lines on each slope, 

 and a third less plain at the spiracle, equidistant from each other. 

 The lateral flange hairs are faintly brown, most of the dorsal blackish. 

 The hair bases are dark but not black and rather inconspicuous. 

 The ground-colour is a pale almost yellowish grass-green. (Figs. 

 8 and 9.) 



June 7, 1914. — The other 4, or 3 at least, are smaller, 

 10-11 mm., much darker green, the yellow lines much the 

 same in position, etc., but dim and obscure, instead of 

 bright and prominent. The yellow lines on slopes just 

 visible and only in some lights. All hairs darker than in 

 the first larva ; supra spiracular row of hairs similar to 

 those of the other except that they are more conspicuous 

 in last segments. (Figs. 10, 11, 12.) 



June 25th. — Of the above 5 larvae all duly pupated, 

 together with one other (the sixth), between the 15th and 

 20th inst. 



A special note of the variation in the larvae was taken 

 when the question as to whether they were all of one species 

 was in doubt. 



Jiine 11, 1914.— (1) A larva about full grown with very 

 brilliant narrow yellow lateral line, dorsal line, only a 

 rather yellower green than grass-green ground-colour, 

 oblique lines even less clear, long hairs all rather dark, 

 one or two nearly black on middle of slope, each 

 segment. 



(2) A similar larva, but hairs nearly colourless and dorsal 

 yellow lines rather more distinct. 



(3) Three smaller larvae with lines more distinct, one with 

 ground-colour almost a yellowish green. 



(4) A smaller larva (in 4th instar) has rather darker 

 ground-colour and proportionally rather darker and longer 

 hairs. ? is this the only eros? 



(5) A larva like 1st, but dorsal line on 1, 2, 3 and 4 

 abdominal is wanting on right side. 



The remainder were decidedly smaller and rather more 

 uniform in tint, and fed very slowly. Were these smaller 

 larvae eros and the first six something else, icarus probably ? 

 These smaller larvae are represented by Fig. 13. 



In the event, there could be no doubt that all my larvae 

 were eros, and that I had found no larvae but eros on the 



