THE ENTOMOLOGIST. 95 



had the head and feet very nearly black. The body was 

 yellowish green on the back, the ventral surface and anal 

 extremity being paler (see fig. 1). On the 15th of May some 

 had moulted for the last time : they retained the colour 

 which they then assumed until they began to spin up, when 

 they were about 1.6 centimetre long. The head was shining, 

 pale olive-brown or brownish green ; the sutures of the vertex 

 somewhat greener; the mandibles somewhat browner, with a 

 black border to the serratures ; maxillae and palpi greener. 

 The eyes were inserted in round black spots ; the vertex was 

 beset with short, stiff little hairs (fig. 4). The body was pale 

 green, of a somewhat less yellow tint than before ; not only 

 were the abdominal and anal legs of that colour, but even the 

 thoracic legs also, which were glassy green, with brown 

 claws. Not only did the legs of the larvae at this stage differ 

 from those of the younger larvae in colour, but also, to a 

 certain extent, in form ; and in order to show this more 

 clearly I have given, at fig. 3, a magnified drawing of the two 

 placed next to each other. From this it will be seen that the 

 legs of the young larvae have a smooth brown-margined 

 space on the femur, where the skin appears to be thinner than 

 on the sides. Can it be that the body of the younger larvae 

 presses more upon the feet, which causes these latter always 

 to form a sharp angle between the tibia and femur, so that 

 the tibiae are continually pressed against the upper part of 

 the femora ? I omitted to observe this point in the living 

 animal; it might, however, afford some explanation of the 

 origin of this peculiar spot. The abdomen was much 

 wrinkled on the dorsum, more especially on the anterior 

 segments : on each segment, from the first to the sixth, were 

 two transverse rows of extremely minute spines of a dark 

 green colour. The spiracles were very small, and deep 

 brown. 



The most advanced larva of those which I had received 

 from Renkum spun up on the 18lh of May; those sent by 

 Dr. Wtlewaal did not spin up till the 27th of May, and in all 

 cases at the bottom of the box in which they were kept. 

 Under natural conditions they probably form their cocoon on 

 the surface of the ground, against or among the stems of the 

 columbine. Some of the cocoons were deep yellow; others 

 were straw-coloured, with a tinge of green : they were all 



