CELERIO GALLII. 181 



parts and cheeks. The scutellum also dark olive, almost black. 

 The ground-colour of the body dark dusky olive-green, slightly 

 paler on lateral area ; a pale green mediodorsal band looks almost 

 white against the dusky skin ; the shagreen-spots show up very 

 markedly against the dark ground-colour and also appear almost 

 white by contrast therewith. The true legs, anal plate, and plates 

 at base of prolegs are dark olive-green, almost black. (This is the 

 most conspicuously marked of the three forms of the larva under 

 observation.) No. 3 in third instar. — [This is a still further pro- 

 gression from the pale green form (No. 1) than is No. 2.] Head, 

 scutellum, true legs, plates on prolegs and anus entirely black ; 

 the dorsal area without median stripe and shagreen-spots, though 

 faint traces of latter are observable near the subdorsal bands, and 

 a very faint mediodorsal band shows up just before moult. The 

 colour of skin of so dark and dusky an olive tint as to be almost 

 better described as black ; the lateral and ventral areas, probably 

 on account of the shagreen - spots being welldeveloped, look 

 paler and greener, although the dark pigment under unspotted 

 portion of skin is possibly not really less intense ; the yellow sub- 

 dorsal and infraspiracular bands are unaltered (as is also the case in 

 No. 2), but they show up more brilliantly by contrast. Fourth instar : 

 No. 1. Coloration and pattern now the same as those of Nos. 

 2 and 3 in same stadium. The ground-colour may be of a rather 

 lighter shade of green and less dusky, whilst the bands and medio- 

 dorsal line are a little better marked, but, in all other respects, it is 

 identical ; there is a slight orange tint on the yellow spots, but not 

 so well marked as in No. 3. Nos. 2 and 3 in fourth stadium (August 

 8th, 1901). The head, scutellum, and anal plate sooty- black, the 

 body dark sooty-olive, almost black ; both show a narrow, rather 

 disconnected mediodorsal line (although completely absent in the 

 last instar in No. 3). The subdorsal and infraspiracular stripes more or 

 less broken into a chain of vivid yellow spots, more marked in 

 the subdorsal than in the infraspiracular band ; the bright yellow oval 

 spots that occurred in the subdorsal band (on 1st subsegments) are now 

 much enlarged, roughly oval in shape, and form the conspicuous 

 feature of the larval coloration, the subdorsal band itself forming 

 only a weak line connecting them. In No. 2 the subsegmental 

 (1st) spots are pure yellow, in No. 3 the central area of each spot 

 is orange-red. The tendency for the infraspiracular band to enlarge 

 into a series of spots beneath the spiracle is still noticeable, but it is 

 not further developed as is the case in the subdorsal series, there 

 being a tendency for the whole of this band to degenerate. The 

 coloured spots at the base of the shagreen-hairs form a very marked 

 feature, existing as somewhat large pale yellow specks, but, although 

 present on both the lateral and dorsal areas, they are absent on 

 the dorsal area of the large 1st subsegment, the head, scutellum, 8th 

 abdominal and anal segments ; their presence on parts of the dorsum 

 of larva No. 3 in this instar is noticeable in contrast with their 

 entire absence in the preceding instar on these areas. Spiracles 

 pure white, with a chitinous rim, their size more equal, although 

 those on the 7th and 8th abdominal segments still remain some- 

 what enlarged. The caudal horn better developed than before, 

 thick at base, tapering to a point, thorny, shiny, dark-coloured 

 for the upper three-fourths of its length, but pale at base. Fifth 



