(14) 
45. Aphis pinieolens, 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. populicola ; 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. Off. Rep., 1855. 
Grreen 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 acerisi Linn., Syst. Nat., II, 736. 
Occurs, according to Dr. Fitch, on Acer pennsylvanicum. 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., Mou. Pflanz., 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. 
