i'7s 



Bionomics of WeeriU 



body is cylindrical in shape and tapers slightly towards the extremities. 

 It is usually bent in a curve. It is creamy white in colour, soft and 

 fleshy, and there are many transverse wrinkles on the back dividing 

 the segments up into folds. These folds bear various reddish brown 

 bristles which are constant in number and position in this species. The 

 head is comparatively small, measuring 0-635 mm. long by 0-62 mm. 

 broad. The frons and epicranium are deep ochreous in colour, becoming 

 darker in colour towards the epistome which is reddish chestnut. The 

 jaws are prominent, dark reddish brown. The antennae are extremely 

 small, two jointed. There are no eyes. The body is divided into segments, 

 of which there are three thoracic and ten abdominal, but the last 

 abdominal segment is very small. Along the side of the body is a con- 

 spicuous longitudinal fold, the epipleural fold, above which the spiracles 



Fig. '.\. Newly hatched larva of Sitones lineatus L. Dorsal view 94. 

 A = antenna; M = mandible; MX = maxilla. 



are situated. The spiracles are nine in number; the first pair is situated 

 between the prothorax and the mesothorax, the remainder are situated 

 on the abdominal segments 1 to 8. 



It is intended to give a more detailed description of this larva in a 

 subsequent paper dealing with the comparative anatomy of the larvae 

 of the injurious species. 



The Newl?/ Hatched Larva. (Fig. 3.) 



The newly hatched larva differs from the adult larva in the following 

 points. It is much more active and quick in its movements. Its bristles 

 both on head and body are proportionately very much longer and in- 

 crease greatly in length towards the end of the body. Their arrangement 

 appears to be much the same as in the adult, but the lobes of the body 

 on which they occur are not clearly represented. The spiracles are cora- 

 paratively large and situated in the same position as in the adult. The 



