Early stages of Latiorina pyrenaica. 405 



which there are two : one, the lower, at mid-segment with the 

 black spiracle in its hollow, and the upper one, rather in front of 

 the middle of the segment. The lateral line is pale yellow, with a 

 conspicuous rosy pink patch above it and another below on each 

 segment, sufficiently divided at each incision not to be a continuous 

 line, but looking so on a casual glance. The underside green, but 

 of a slightly olive tint as compared with upper surface, no trace of 

 honey-gland or of fans. 



June 17th. — Another specimen agrees, except that the 

 red patches of lateral flanges meet in middle of segment, 

 making the yellow line consist of patches at front and hind 

 margins of segment, and these are so small on 6, 7 and 8 

 abdominal segments that the yellow line is here practically 

 obliterated. The green ground-colour of this specimen is 

 perhaps rather darker. 



Another specimen agrees with first, except that the lateral 

 line is almost white. This one has since last night eaten 

 the central portions of a rosette of the food and the upper 

 surface (leaving the lower cuticle) of several larger leaves. 



June 18th. — Placed a larva that was busily eating A. 

 villosa on A. vitaliana, with a leaf or two of Soldanella, last 

 evening. This morning it has not touched either, but placed 

 again on A. villosa, it shortly commenced eating, and con- 

 tinued eating all day as if to make up for lost time. 



June 19th. — One has died with the hard black patches 

 disorder. This is the larva with skin structures shown in 

 PI. LXXVI and LXXVII so curiously demonstrated. 



June 22nd. — The three full-grown ones seem to have 

 settled down for pupation, look bunched, and are quiescent. 

 The small one seems really to be in last skin, as it has not 

 moulted, is eating well and growing ; its darker colour was 

 no doubt due to inexpansion of skin after recent moult. 

 It eats especially the fruit-pods, i. e. the calyx contents of 

 the now dead flowers. 



June 23rd. — One of the full-grown larvae appears to be 

 parasitised; it has much the form of a larva waiting for 

 pupation. Yesterday the tracheae were very visible, to- 

 day they are not, and the whole larva is darker, and 

 feels very firm and resistant, suggesting a dipterous pupa 

 within. 



Material being scarce, it seemed desirable to secure the 

 larval skin whilst it seemed perhaps possible to remove it 

 from the parasite. This being done, it was found that the 



