The Zoologist— August, 1868. 1329 



Genus 2. Lachnus, Illiger. 



Antennae six-jointed, smooth, much shorter than the body. Nectaries 

 tubercle-shaped. Tail not visible. Fore wings with the cubital vein 

 twice-forked; fourth vein almost straight. 



Typical species, L. Pinicola, Kaltenbach. 



A. Abdomen with a conical tubercle between the nectaries. . 1. Viminalis. 



AA. Abdomen with no tubercle between the nectaries. 

 A. Rostrum shorter than the body. 



a. Viviparous apterous female smooth, oblong-elliptical. . 2. Pinicola. 



aa. Viviparous apterous female pubescent, nearly globose. . 3. Juniperi. 



A A. Rostrum at least twice longer than the body. 



a. Viviparous apterous female brown, shining. Fifth joint of 

 the antennae as long as the fourth and shorter than the 

 sixth. . . . . . • .4. Quercus. 



aa. Viviparous apterous female cinereous-powdered. Fifth 

 joint of the antennas longer than the fourth and than the 

 sixth. ...... 5. longirostris. 



Genus 3. Callipterus, Koch. 



Rostrum very short. Fore wings with the fourth vein curved ; 

 stigma trapezoidal. In other characters like Lachnus. 

 Typical species, Aphis Juglandis, Frisch. 



A. Abdomen with black dorsal spots. Veins of the fore wings 



broadly brown-bordered at the lips. .... l.Juyhmdis. 



AA. Abdomen luteous, not spotted. Veins of the fore wings not 



bordered. . . • . . . -2. Juglandivola. 



Genus 4. Pterochlorus, Rondani. 



Rostrum long, not extending beyond the body. Fore wings with 

 the fourth vein curved ; stigma trapezoidal. In other characters like 

 Lachnus. 



Typical species, Aphis longipes, Leon Dufour. 



Genus 5. Phyllaphis, Koch. 

 Body woolly. In other characters like Callipterus. 



A/>kis Fagi, Linn. 

 SECOND SERIES — VOL. III. 2 B 



