the Life History of Trichoptihis paludum. 135 



Sept. 16th. On one plant a small larva, by the con- 

 spicuousness of his darkish tubercles, in its second skin, is 

 seen down amongst the leaf-stems just outside the central 

 heart, covered by a slight web of silk, and this a little 

 obscured by some frass. On another plant a small larva 

 is exposed in about the same situation ; this one is well- 

 fed up in first skin. 



Remainino- egtrs are still unhatched. 



Sept. 17th. Tlie larva under the web has thickened it 

 both with silk and other material (frass?), so that he is 

 now invisible. On another plant the exposed larva is now 

 quite fat in first skin but is still exposed. 



Sept. 22nd. The cocoon is still firm and opaque, its 

 strong structure leads one to suppose it is for hibernation. 

 It is placed between an outer dying leaf-stalk (of a not 

 thriving plant) and the central bud-bulb and the adjacent 

 leaf on its inner side looks as if dying at the tip from being 

 eaten or excavated ; this is the only point to suggest that 

 larva is feeding. 



The "exposed" larva, though looked for every day, has 

 been invisible since l7th, and it was feared something 

 might have happened to it; to-day, however, it is out 

 crawling over the minute leaves of leaf-bud in centre of 

 plant; no trace is seen (of course without pulling plant to 

 pieces) of where it spent the interval. It is now in 2nd 

 instar. It is about 1'5 mm. long, head dark of about same 

 width as body. I and II are on one large ciiitinous base, 

 III, IV, and V, smaller. These bases have a slight dark 

 tint, the hairs are long, II nearly as long as width of body, 

 I perhaps \ of II, III long, IV and V each rather shorter. 

 The larva might be described as pale whitish-fuscous with 

 a reddish dorsal line and another between II and III, but 

 it seems more accurate to say the ground-colour is pale 

 reddish-brown, and that there is a narrow white line round 

 each large tubercular plate. The larva being young, in 

 this instance I and II reach practically from front to back 

 of segment, leaving only room for the narrow pale line. 

 The hairs are very distinctly thickened at the tips. 



Sept. 2-lth. A plant on which a larva was placed, 

 September 6th, and of which no trace could since be found 

 although the plant has been examined most carefully 

 nearly every day, when examined to-day was found to 

 have on it a larva in second skin which was constructing 

 a silken web over itself, at the side of the central bud and 



