A SYNOPSIS OF THE APE I DID AE 85 



studying specimens while working up a key to the species of Rhopalo- 

 siphum, he found that structurally this species was identical with 

 Rhopalosiphum nervatum Gillette. The latter had been taken on roses 

 in the San Francisco Bay region. The identical structure and the 

 scarcity of alates on madrone led to a belief that they were the same 

 species. However, it was too late in the season (October, 1915) to 

 try any transfer tests. No opportunity was found to try migration 

 tests until in February, 1917, when the species was taken in Redlands. 

 Two alate females were reared in the laboratory and then placed 

 under a muslin bag on a rose bush, out of doors. A few days later 

 these were examined and several young larvae observed. No further 

 observations were made for two weeks, when it was found that the 

 bag had been ripped off by the severe winds. Although this test was 

 not a complete success the author feels confident of the identity of 

 this species. 



104. Rhopalosiphum persicae 13 (Sulz.) 



Figures 108, 119, 120, 168 



Sulzer, Kan. Ins., p. 105, 1761. Aplite (orig. dese.). 



Clarke, Can. Ent., vol. 35, p. 252, 1903. Rhopalosiphum dianthi (Schrank) 



(list). 



Gillette, Jour. Econ. Ent., vol. 1, p. 359, 1908. Myzus (desc.). 

 Davidson, Jour. Econ. Ent., vol. 2, p. 303, 1909. B. dianthi (Schrank), 



E. achyrantes Monell, and Myzus (list). 



Davidson, Jour. Econ. Ent., vol. 3, p. 377, 1910. E. tulipae Thomas (list). 

 Davidson, Jour. Econ. Ent., vol. 3, p. 378, 1910. E. dianthi (Schr.) (list). 

 Davidson, Jour Econ. Ent., vol. 3, p. 379, 1910. Mysus (list). 

 Essig, Pom. Jour. Ent., vol. 3, p. 598, 1911. Myzus (desc.). 



Eecords. Throughout California by Clarke, Davidson, Essig, Ferris, Morrison, 

 and the author on Abutilon sp., Amaranthus retro fiexus, Amsinclcia respectabilis, 

 Bougainvillaea sp., Brassica spp., Capsella bursa-pastoris, Capsicum annuum, 

 Catalpa sp., Chcnopodium murale, Citrus spp., Cynoglossum grande, Ci/ticus pro- 

 liferus, Geranium carolinianum, Hedera helix, Lycopersicum esculentum, Malva 

 parviflorus, Oxalis oregona, Prunus spp., Eanunculus califomicus, Eaphanus 

 sativus, Eumex spp., Sambucus glauca, Sanicula menziesii, Senecio vulgare, 

 Solanum tuberosum, Sonchus spp., Tropaeolum sp., Tulipa sp., Vinca major. 



This green peach aphis is one of the most common aphids found 

 in the state. It is most abundant in the spring, at which time it will 

 be found on almost any plant. According to Gillette various species 



is George Shinji (Can. Ent., vol. 49, p. 49, 1917) recently described an aphid 

 from specimens taken on Godetia amaena in Berkeley, which he named Myzus 

 godetiae n.sp. The author has not seen specimens of this species, but from the 

 description and figures, it is in all probability Ehopalosiphum persicae (Sulz.). 



