54 MISCELLANEOUS STUDIES 



Antennal tubercles with a distinct but not prominent blunt projection forming 

 the inner angle (fig. 112), but the prominent teeth as above are lacking. 

 Cauda short, tapering, and usually triangular (fig. 121). Cornicles as 

 above, being cylindrical, with a slight tapering from base to apex, and 

 often slightly outcurved at tip (fig. 122) Myzus Passerini 



21*. Genus Amphorophora Buckton 



Buckton, Monog. Brit. Aphides, 1876. Type A. ampullata n.sp. 

 KEY TO CALIFORNIAN SPECIES 9 



Cornicles pale, or at most slightly dusky, swollen and vasiform (fig. 113). VI 

 spur longer than III, the latter with 35-45 sensoria riibi (Kalt.) 



Cornicles black, greatly dilated in apical one-half (fig. 161). VI spur shorter 

 than III, latter with 13-17 sensoria latysiphon Davidson 



56. Amphorophora latysiphon Davidson 



Figure 161 

 Davidson, Jour. Econ. Ent., vol. 5, p. 408, 1912 (orig. desc.). 



Records. Vinca major, San Jose (Davidson) ; Courtland, Contra Costa County 

 (Davidson) ; Stanford University, 1912 (Morrison, Essig). Convolvulus arvensis, 

 San Jose (Davidson). Solarium tuberosum, Walnut Creek, Contra Costa County, 

 1915 (Davidson). 



This species has been found sparingly in the San Francisco Bay 

 region on periwinkle, morning-glory, and potato tubers, although it 

 has never seemed to be common. The author has not collected it, his 

 only specimens being some taken by Essig on periwinkle near Stan- 

 ford University. The odd shape of the cornicles is a distinguishing 

 character. 



57. Amphorophora rubi Kalt. 



Figures 111, 113, 162 



Kaltenbach, Monog. d. Pflanzenlause, p. 23, 1843. Aphis (orig. desc.). 

 Davidson, Jour. Econ. Ent., vol. 5, p. 411, 1912 (list). 

 Shinji, Can. Ent., vol. 49, p. 52, 1917 (list). 



Records. Hubus parviflorus; San Jose (Davidson) : Eubus spp., Walnut Creek, 

 1915 (Davidson); Berkeley (Shinji). 



This species has been taken a few times on thimble-berry in the 

 San Francisco Bay region. Davidson writes that he has also found 

 it on blackberry and loganberry in the vicinity of Walnut Creek, 



G. O. Shinji (Can. Ent., vol. 49, p. 51, 1917) described an aphid from Ciculta 

 virosa var. calif ornica in Berkeley, which he called Amphorophora cicutae n.sp. 

 The author has never seen specimens, so does not feel that he can recognize this 

 as a good species. Of some half dozen new (?) species described by Shinji the 

 author has found none, on examining specimens, that are good species, hence he 

 cannot recognize this one at present. 



