LAOHNUS LONGIPES. 59 



remarkable, and difficult of explanation, for on one 

 day trees may be black with tliem, and the next day 

 none can be found, even by a careful search of the 

 earth at the base of the trunks before infested. 



The attacks of this species are often confined to 

 particular trees, and in particular plots ; sometimes a 

 single spruce in the midst of others is alone infested. 



Mr. Fitch, of Maldon, failed to obtain for me a 

 single winged female ; and I was unable to breed any 

 from numerous apterous specimens he kindly for- 

 warded, notwithstanding that I for some days kept 

 them in confinement. 



On the 28th of December of the same year, and 

 from the same entomologist, I obtained some small fir- 

 tufts of spruce which were covered with the black 

 shining eggs of this same species. These ova were 

 glued to the green pinnies in rows, a drawing of which 

 may be seen in Plate C. 



Walker met this species in great abundance on the 

 silver fir, Abies picea; and near London on the spruce. 

 He took it also frequently on the firs of the Grimsel 

 Alp, and it has been likewise found in Siberia. The 

 winged insect has very large wings, and has a colouring 

 very similar to the larval form above noted. 



Kaltenbach describes Ajohis picece of Panz., but he 

 thinks that probably it is identical with Lachnus 

 innicolus. 



I have failed in precipitating the red dye formed 

 by this and other Lachnince, as a lake or a carmine 

 compound : thus it does not imitate the behaviour of 

 solutions of cochineal or madder. 



Lachnus longipes, Ditfour. Plate CI, fig. 1. 



Ajyhis longipes,iLmn} Dufour. 



,, rohoris, Fonsc. 

 PterocJilorus longipes, Rond. and Pass. 



VOL. III. 5 



