(14) 



45. Aphis pinioolens, Fitch. Ibid. 



Straw-yellow. On the Pine. 



46. Aphis populifoliae, Fitch. Ibid. 



Chestnut-brown, pruinose. On leaves of Populus grandidentata. 

 Probably belongs to Chaitophorus, and may be identical with the one 

 one I have named Ch. popidicola; but Dr. Fitch's description is too 

 short and unsatisfactory to decide this point. 



47. Aphis candicans, Fitch, 



On the leaves of Populus candicans. Probably belongs to Chaito- 

 phorus. 



48. Aphis gossypii, ? Pat. OX Rep., 1855. 



Green or yellow, thorax striped with black. On the leaves of 

 cotton. 



49. Aphis ? caryella, Fitch. 



50. punctatella, Fitch. 



51. maculella. Fitch. 



52. fumi pennella, Fitch. 



53. marginella, Fitch. 



These species, according to Dr. Fitch, are found on the Hickory. It 

 is more than probable that they are varieties of one species. They 

 most likely belong to Passerini's genus Pterocallis : at any rate they 

 belong to the tribe under consideration. 



54- Aphis aceris, Linn., Syst. Nat., II, 736. 



Occurs, according to Dr. Fitch, on Acer pennsyhanicum. If he is 

 correct in his determination, it will belong to the genus Chaitophorus. 

 The winged specimens black, the apterous yellowish and very hairy ; 

 honey-tubes very short. 



Genus Rhopalosiphum. 



Similar to Siphonophora, but differs in having the honey-tubes en- 

 larged in the middle. 



55- Rhopalosiphum berberidis ? Kalt., Mod. Pilanz., 95. 



Aphis berberidis, Fitch, Senate, No. 30, 65, 1851. 

 Black, abdomen yellow. On the leaves of Berberis vulgaris. 

 I doubt the identity of Fitch's and Kaltenbach's species, although 

 infesting the same plant ;. the difference in color is too great. 



