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



by Mr. E. C. Knight and two by Mr. Frohawk, of which one 

 shows the remarkable aspect of the recently moulted larva 

 when seen from the front. 



The skin armature is shown in PI. XCV, fig. 33, and 

 various details in the following plates. 



April 28th. — Larvae Nos. 1 and 2 have apparently fixed 

 for pupation, one at angle at top of tin, the other at bottom 

 under leaf scraps. So far as can be seen without disturb- 

 ance, there is no girth or cocoon material, though probably 

 a pad. 



When the larvae reach this stage, they become rather 

 shorter and thicker, not at first very different in colour, 

 though later a little duller ; the surface has a smooth glazed 

 look, and the slope assumes the smoothed surface with a 

 double (upholstered hollow) almost precisely as described 

 and figured in my account of the larva of thersites (Trans. 

 Ent. Soc. 1914, p". 197, figs. 7 and 8, PI. XXVII). 



May 8th. — No. 1 pupated. Those noted as set up for 

 pupation, April 28th, proved not to be so, but moved again, 

 choosing fresh places ; others since have fixed themselves up, 

 some making quite a cocoon. 



May 28th. — The larva likes to secure a narrow space, 

 almost a tube in which it nearly fits if possible, and spins 

 some threads both above and below it, very flimsy and only 

 noticeable as an anterior and posterior defence, when the 

 space is very narrow ; in other cases they amount to a little 

 apparently meaningless spinning. The two sets of threads 

 appear to be quite separate and not parts of a " cocoon," 

 nor do they show any approach whatever to either a girth 

 or a pad, though the larva skin may adhere lightly to the 

 lower silken diaphragm. 



The pupa lies quite unattached, the larva skin adherent, 

 in all my specimens, to the last segments. 



When quite mature, but before the eyes darken, the pupa is pale 

 ochreous as to head, appendages and wings, gradually passing on 

 the thorax into a pale greenish and on the abdominal dorsum 

 quite a light green, with an ochreous overshading and a dark dorsal 

 line (dorsal vessel). The dorsum (except over dorsal vessel) and 

 sides have numerous short fine hairs of a brownish colour (the 

 appendages have none). The spiracles are pale. 



The length is 11 "0 mm., 11 '5 mm. and one specimen only 10*0 mm. 

 It must be remembered that these belong to the smaller Pyrenean 

 (rondoui) form. 



