A SYNOPSIS OF THE APHIDIDAE 77 



Davidson recently described all forms of this species from speci- 

 mens taken during March, April, and May, 1913, 1914, and 1915, on 

 wild flowering currant in Redwood Canyon, Contra Costa County. 

 The author is unacquainted with the species. 



94. Myzus varians Davidson 



Davidson, Jour. Econ. Ent., vol. 5, p. 409, 1912 (orig. desc.). 

 Record. Clematis ligusticifolia ; San Jose (Davidson). 



Davidson found this species on the under side of the leaves of 

 wild clematis, or Yerbade chivato, near San Jose, and later in Walnut 

 Creek, Contra Costa County. The author is unacquainted with the 

 species. 



25. Genus Nectarosiphon Schouteden 



Schouteden, Aphidologische Notizen, Leipzig, 1901. Type Macrosiphum 

 rubicola Oestlund, n.n. for Macrosiphum Oestlund, preoccupied. 



KEY TO CALIFORNIA SPECIES 

 1. Body quite large, being about 3 to 4 mm. in length. Wings with dusky spot 



near tip rubicola (Oestlund) 



Body not so large, being only about 1.5 mm. long. Wings without dusky spot 

 near tip morrisoni Swain 



95. Nectarosiphon rubicola (Oestlund) 



Figures 107, 109, 123 



Oestlund, Minn. Geol. Nat. Hist. Surv., vol. 14, p. 27, 1886. Macrosiphum 



(orig. desc.). 

 Davidson, Jour. Econ. Ent., vol. 7, p. 136, 1914. Amphorophora (list). 



Eecords. Hubus nutlcanus; Contra Costa County (Davidson) ; Berkeley (Essig, 

 Shinji). 



This species is sometimes found infesting the tender leaves and 

 shoots of thimbleberry in the San Francisco Bay region. The most 

 distinctive character which readily separates it from Amphorophora 

 rubi (Kalt.) is the presence of a dusky patch near the tip of the fore- 

 wing. This was originally described by Oestlund as the type of his 

 genus Macrosiphum. However, this name was preoccupied by Macro- 

 siphum Passerini, so Schouteden proposed the name Nectarosiphon 

 for this genus. Davidson listed this species as Amphorophora, and 

 Morrison writes that he has never been able to satisfy himself why 



