64 BEITISH APHIDES. 



Lengtli of the trunk about twice that of the body. 

 They occur winged and apterous, but the former are 

 less common. " The wings are carried perpendicu- 

 larly, like those of a butterfly." The insects have an 

 " odeur assez forte." Other authors do not seem 

 to have noticed this character. Bonnet thinks this 

 long trunk is used for probing the crevices of the bark 

 as well as for suction. 



He also discovered the apterous male ; he gives a 

 ludicrous account of the insect's antics during court- 

 ship, and he states that both antenn83 and legs are 

 rapidly vibrated at the same time. 



Passerini remarks that Lachnus longirostris is diverse 

 from Lachnus quercus. The food certainly is different, 

 for the former insect feeds on the willow and the 

 poplar, instead of on the oak. 



Linnaeus probably describes this insect under the 

 name of Aphis quercus. He gives for characters, " Pro- 

 boscide longissima, habitat in corticibus quercus in 

 Grallia. Maxima nostratum atra, alse hyalinse margine 

 externis atro, antennarum pedum que articuli basi 

 ferruginei. Rostrum longitudine abdominis. Ab- 

 domen muticum. 



Genus XXII.— PARACLETUS,* Heyden. 



Rostrum variable in length, but shorter than in 

 Trama. 



Antennge six-jointed, with a nail at the extremity of 

 the sixth ; third, fourth, and fifth joints nearly equal. 



Cornicles : none. 



Legs long ; tarsi biarticulate ; claws two. 



Eyes moderately developed. In this particular it 

 differs from Trama. 



* From TrapaK\r]Toe, a consoler ; probably referring to these insects 

 l^eing cherislied guests in the nests of ants. 



