NBMATUS BELLUS. 201 



seen one or two specimens with the epistoma yellow. 

 The tarsi may be coloured like the rest of the legs, or 

 may be more or less brownish. 



It forms irregular, more or less roundish, oblong, or 

 oval galls on Salix aurita and 8. caprea ; they are 

 greenish, often with red cheeks and covered with 

 longish pale hair. I am not aware of any points 

 wherein the larva differs from that of N. salicis~cinerece t 

 and in habits they are identical. 



I am not satisfied that this is anything else than a 

 form of N. salicis-cinerece. An examination of long 

 series of both shows that they approximate very closely 

 in all respects, both showing considerable variation in 

 colour and size ; there does not seem either to be any 

 tangible difference in the structure of the saws, and I 

 am equally unable to point out any difference between 

 their larvae. There is no difference in the form of the 

 galls, for although the gall of bellus is usually more 

 irregular in shape than that of salicis-cinerece, still the 

 galls of the latter vary also. The fact of the bellus galls 

 being hairy is clearly owing to the willow leaves being 

 hairy. 



N. baccarum is apparently a distinct species from the 

 above, being easily known by the white legs and 

 stigma, as well as by the larva not changing colour 

 before pupating. At one time (before the description 

 of bellus had appeared) I thought that it was identical 

 with baccarum, the types of bellus I had from Herr 

 JBrischke having the stigma very pale and the legs 

 more pallid than in any of the Scotch specimens reared 

 from the hairy pea-shaped galls. 



Common. 



Continental distribution : Germany. 



O&s. Zaddach (Schr. Ges. Konig., xxiv, p. 348) considers that the 

 form I described under the name of N. vollenhoveni, is probably distinct 

 from his viminalis. Further research is, however, needed before this 

 point can be decided. 



