56 NEMATUS FULVIPES. 



mouth. When forming these it commences at the leaf- 

 stalk and emits a little of the secretion from the mouth ; 

 after the secretion is ejected it raises the head, where- 

 upon the fluid dries ; when the foot-stalk has been 

 covered the larva turns round it had been resting 

 during this process with the hinder body on the leaf 

 and the head on the leaf-stalk and creeps round on 

 to the leaf and raises a whole row of similar points 

 quite close to each other. Inside of this circle it feeds ; 

 after a time it eats up the palisades and commences to 

 construct a fresh circle on another part of the leaf. 

 These points appear to be formed of dried bubbles and 

 are highly iridescent. Yan Yollenhoven suggests that 

 their use may be to protect the larvae from the attacks 

 of ichneumons and other enemies. 



When old it feeds on the edge of the leaf, eating well 

 into its centre and not raising these palisades. 



The larva has its head round, but depressed ante- 

 riorly, pale greenish, with two brownish-green stripes 

 running obliquely across the vertex; mouth brown, 

 eye-spots black. The body is pale green, clothed as 

 it were with pale granules, more particularly round 

 the spiracles and on the sides above the legs, which 

 are green and somewhat darker at the joints. 



The larval state lasts four or five weeks, after which 

 it proceeds to pupate in the earth, the fly appearing at 

 the beginning of July. 



This does not appear to be a common species in 

 Britain. I have only seen it from Grlanville's Wootton 

 and Worcester. 



In Europe it is met with in Germany, Denmark, 

 Holland, France, and Italy. 



4. NEMATUS FULVIPES. 

 PL XVI, fig. 2, Saw. 



Tenthredofulvipes, Fall., Acta, 1808, 113, 51. 

 Pristiphora rufipes, Lep., F. Fr., pi. 12, f. 2; Mon., 60 174- 

 Ste., 111., vii, 26, 4. 



