A SYNOPSIS OF THE APHIDIDAE 179 



104. Rhopalosiphum persicae (Sulzer), on Baccharis douglasii, Centranthus 

 ruber, Clarkia elegans, Dipsacus fullonum, Escallonia pulverulenta, Helianthus 

 annuus, Lavatera assurgentiflora, Liriodendron tulipifera, Melianthus major, 

 Pentstemon spectabilis, PittosporUm spp., and Umbellularia californica, Berkeley 

 (Essig, pp. 331-332). 



111. Aphis avenae Fabr. It would appear from a study of Baker's paper in 

 Science that the common California species is Aphis prunifoliae Fitch. It is 

 certain that it is distinct from A. cerasifoliae Fitch, which has been taken here 

 once and is described in this paper. If it is possible, as Baker says, that A. 

 cerasifoliae Fitch is a synonym of A. padi Linn., then our common species must 

 be known as A. prunifoliae Fitch. From the brief description of Aphis (Siphon- 

 aphis) padi Linn, given by Van der Goot (pp. 71-72) it would appear that our 

 species may be distinct, differing slightly in the comparative lengths of the 

 cornicles and cauda. Consequently the author favors accepting the name, Aphis 

 prunifoliae Fitch, for this species. 



123. Aphis gossypii Glover, on Asclepias speciosa, A. vestita, Lilium speciosum 

 rubrum, Lonicera sp., and Ehamnus purshiana, Berkeley and Oakland (Essig, 

 pp. 338-339). 



131. Aphis raedicaginis Koch, on Citrus sp., Sacramento, and on Vigna sin- 

 ensis, Moorpark (Essig, p. 340). 



139. Aphis pomi De Geer, on Cotoneaster franchetii, Pittosporum eugenioides, 

 and Viburnum tinus, Berkeley (Essig, p. 341). The author is inclined to believe 

 this to be Aphis viburnicolens n.sp. (see no. 150) which is quite similar to Aphis 

 pomi De Geer, but which is common on Viburnum and related plants. He has not, 

 however, seen Essig 's specimens, so can not state positively whether or not it is 

 this species. 



140. Aphis prunorum Dobr. Dobrovliansky places this species as a synonym 

 of Siphocoryne nymphaeae (Linn.). This author noted the similarity of these 

 two, but was not certain of their identity, so listed them as distinct species. 



141. Aphis pseudobrassicae Davis. Dobrovliansky believes this to be a syno- 

 nym of Aphis erysimi Kalt. 



146. Aphis senecio Swain. Essig (p. 337) lists Aphis bakeri Cowen from 

 Trifolium pratense. This proves to be the true Aphis bakeri Cowen and not 

 A. senecio Swain, which is the species that has been hitherto called A. balceri 

 Cowen in California. 



152. Toxoptera aurantii (Fonsc.) on Camellia japonica, Oakland (Essig, p. 

 330). 



153. Hyalopterus arundinis (Fabr.). Both Dobrovliansky and Van der Goot 

 list this as a synonym of H. pruni (Fabr.) giving the later preference. Accord- 

 ing to Hunter, arundinis should have priority, but it is entirely possible that the 

 dates he gives are incorrect. This point the author is unable to settle as he has 

 not access to Fabricius' works. 



156. Siphocoryne nymphaeae (Linn.). Davidson gives a brief account of the 

 habits and biology of this species, as well as a description of the various forms. 



175. Eriosoma languinosa Hartig (pyricola Baker and Davidson). The 

 species listed by Essig (p. 345) as Eriosoma sp. on Ulmus campestris in Berkeley 

 and in Hayward is this species. 



115. Aphis carl Essig. Davidson recently remarked to the author that he 

 could see no difference between this species and Aphis helianthii Monell. It is 

 quite possible that these are synonyms. 



