788S 



Insects. 



darker than the ground colour. All my larvae had a triangular spot 

 on the crown of the head, blackish to quite black, and always darker 

 than the ground colour ; some individuals had, in addition, two small 

 spots on each side of the head, as represented in the above-quoted 

 work of Dr. Hartig, pi. iv. fig. 1, c. I have not observed a head 

 marked as represented at fig. 16 of the same plate. 



In some individuals the yellowish green colour of the body passes 

 into greenish yellow ; I have seen some of our Netherland species of 

 this tint. The greater number of those which I reared had three 

 darker stripes on the back and sides; that on the back was always 

 conspicuous, while those on the sides were faint. I have represented 

 a rather dark individual at fig. 1. 



Each segment of the body of the larva is divided into six folds, the 

 first, third and sixth having little dark sharp hairs ; these are not dis- 

 tributed in the manner represented by Hartig (pi. iii. fig. 25) in the 

 work above referred to, namely only one row of hairs on each fold, 

 but, as I have endeavoured to show at my fig. 2, growing irregularly 

 all over the fold. At the side, almost in the first fold, is found the 

 elliptical spiracle. Close below and behind are two little cushions or 

 elevations of the integument, also covered with similar pointed hairs. 

 The neck is of the same colour as the under side of the abdomen, 

 namely a dirty greenish yellow. The thoracic legs are black, with 

 dull yellow rings ; the sixteen abdominal prolegs are of the same 

 colour as the belly ; above each are two black transverse marks, the 

 second being almost twice the length of the first ; these form a row on 

 each side of the body, called by Hartig " die schwarze Semicolon 

 Reihe." None of my larvae showed any traces of the spots on the 

 first segment mentioned by this author. The last segment is of the 

 same colour as the ventral surface, but entirely covered with spinous 

 hairs and having two oblique green stripes. The author above referred 

 to also mentions some varieties of these larvae, among others one 

 entirely pale yellow 7 , the head pale brown and without any markings, 

 not having even the two stripes above each proleg. I have not ob- 

 served any examples of this variety.* 



* The following has been communicated to the translator by the author since the 

 above was published in the original. " I have since received from Gelderland the 

 yellow variety almost without marks above the legs. I reared this larva on leaves of 

 the Weymouth pine. The imagos appeared on the 27th of May, showing no differ- 

 ence from the ordinary insect. In July, 1858, I also had some larva?, which were 

 taken at Wassenaar, and which deviated greatly from the usual type. The head was 

 yellowish green, with two blackish spots at the sides surrounding the eyes, and another 



