294 THE CANADIAN ENTOMOLOGIST. 



the sides grow darker. For a time the colours are nondescript, but before 

 the first skin is cast they have become definite and the design is declared. 

 Dorsum rich brown, threaded by a faint lighter medio-dorsal line ; on 

 either side a moderately broad creamy-white stripe, extending from the 

 second thoracic to the eighth abdominal segment, of about equal width 

 to the fifth abdominal segment, tapering gradually and approaching each 

 other posterioily. These stripes include the latero-dorsal hairs, and are not 

 interrupted by the incisures. Lateral areas brown, limited below by a 

 narrower cream-coloured line along the top of the substigmatal fold, 

 beginning at the second thoracic and continuous around the last abdom- 

 inal segment. Ventral surface light green. Length awaiting first moult, 

 2.65 mm.; breadth at fourth abdominal segment, i.oi mm. Duration of 

 first stage five to seven days. 



Second Stage. — At first not differing from preceding. After a day or 

 two a change is observable in the shape of the larva, the segments which 

 since birth have been nearly rounded above (the fovese represented only as 

 slight indentations) assume the complex fold, common in varying degrees 

 to all Lycienid larvae. A little later a very faint, lighter brown spiracular 

 line appears, extending from the third thoracic tJ the sixth abdominal 

 segment, and interrupted by the incisures. Underneath the substigmatal 

 fold the green is of a lighter tint at the base of each proleg. Length at 

 rest for second moult, 6. i mm. Duration of this stage six to eight days. 



Third Stage. — No noticeable change, except in size, for several days. 

 (Plate 9, fig I, larva x 8 ) Then the brown, which up to this time has 

 been of the same shade in all the larvae, begins to show some slight 

 variations. Some individuals grow paler, the brown showing traces of 

 yellow, others become darker, and in one case the brown assumed for 

 about 24 hours a decidedly reddish cast. These alterations in the colour 

 are preliminary to a much more striking cliange, and due probably to the 

 decomposition of a pigment, which at this period in the life of the cater- 

 pillar is no longer of any use. At any rate, the brown weakens just as 

 though a pigment were being removed by metabolic processes, and in a 

 surprisingly short time it has t]uite disappeared, leaving the areas, which 

 were formeily brown, deep pine-needlegreen. Concomitantly the 

 creamy stripes become pure white, and the medio-dorsal and spiracular 

 markings grow larger and better defined. Length wiien up for third 

 moult, 9 mm. Duration of the stage five to seven days. 



Fourth Stage. — During this instar the segments again fill out, 

 reducing the folds and fovete considerably, though they can still be made 



