POLYOMMATUS (LYC2ENA) ALEXIS. 193 



shining black, the plate on the second segment rather 

 darker than the ground ; the spiracles black. When 

 about 1^ mm. long it passes the first moult, not eating 

 the cast skin, and is now pale olive drab all over, the 

 usual dots paler than before, only outlined in black ; 

 the bristles have increased in number, some being short 

 and pale, others longer and darker. The larva is 

 about 2J mm. long before the next moult, and its 

 colour is dull pale green, with a paler double dorsal 

 line, and paler subspiracular line ; after this moult the 

 back is pale greyish-green, with the lines on the dorsal 

 ridges rather paler ; the spiracles round, pale brownish, 

 inconspicuous; the skin set with a number of small 

 warts ; along the dorsal and subspiracular ridges are 

 rows of long bristles, and on the sides some shorter 

 ones. When 9 mm. long the larva is dull full green in 

 colour, with the subspiracular ridge yellowish, the belly 

 and legs yellowish-green, the head shining black, the 

 spiracles green, indistinct, the bristles very pale 

 brownish. The full grown-larva is 12 or 13 mm. long, 

 and nearly 4 mm. wide, the head small, and under the 

 second segment, which is flattened, the other segments 

 slope from the subspiracular ridge up to the double 

 dorsal ridge, the last three sloping down also to the 

 tail ; the segmental divisions deeply cut, the whole skin 

 finely set with tiny hairs ; the colour a dark full green 

 all over, the dorsal ridges paler, the subspiracular 

 ridge yellowish, the sunken spiracles pale green, the 

 head shining black. None of my larvae have spun 

 any girdle for supporting themselves in pupation, 

 although they went up to the cover of their cage 

 for that change ; and when it took place the cast larva 

 skin remained fixed, whilst the pupa had fallen down. 

 The pupa is nearly cylindrical though rather wider 

 than deep, rounded at the ends, 10 mm. long and 

 4 mm. wide across the abdomen ; the back of the 

 thorax rises with a round curve, and drops a little at 

 the waist, the abdomen going in a curve to the tail ; 

 the wing-cases rounded, the pupa skin, especially at 



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