A SYNOPSIS OF TEE APEID1DAE 81 



4. VI spur slightly longer than III (figs. 279, 281). Cornicles quite large and 



heavy (figs. 282, 284) lactucae (Kalt.) 



VI spur about twice as long as III. Cornicles comparatively small and slender 



(fig. 165 ) hippophoaes Koch. 



5. First discoidal vein with distinct, smoky border, second discoidal bordered 



slightly so (fig. 166) nervatum Gillette 



First and second discoidal without smoky borders 6 



6. Abdomen with dusky dorsal markings. Ill with a few (10-12) sensoria 



(fig. 168) persicae Sulz. 



Abdomen without dusky dorsal markings. Ill with many (24-30) sensoria 



(fig. 167) corylinum Davidson 



Apterous viviparous females* 2 

 1. Ground color dark (olive-green, wine, brown) 2 



Ground color light (green, and so forth) 3 



2. Cornicles large and stout, longer than III rhois Monell 



Cornicles smaller and more slender, shorter than III violae Pergande 



3. Cornicles longer than III 4 



Cornicles shorter than III 5 



4. VI spur considerably longer than III, and subequal to cornicles. 



nervatum Gillette 



VI spur about equal to III, and distinctly shorter than cornicles. 



hippophoaes Koch. 



5. Ill with secondary sensoria lactucae (Kalt.) 



Ill with no secondary sensoria persicae (Sulz.) 



100. Rhopalosiphum corylinum Davidson 



Figure 167 



Davidson, Jour. Econ. Ent., vol. 7, p. 134, 1914 (orig. desc.). 

 Records. Corylus rostrata; Walnut Creek, Contra Costa County (Davidson) : 

 Physocarpus capitatus; (Davidson). 



This species was originally described from specimens of alate 

 viviparae and pupae taken on wild hazelnut near Walnut Creek. 

 Davidson writes that he has found it quite common on nincbark in 

 the San Francisco Bay region. The author has never taken the 

 species, but has had access to cotype specimens in Essig's collection. 



101. Rhopalosiphum hippophoaes Koch 



Figures 165, 170 



Koch, Die Pflanzenlause, p. 28, 1854 (orig. desc.). 



Davidson, Jour. Econ. Ent., vol. 7, p. 136, 1914. Phorodon galeopsidis 



Kalt. (list). 

 Gillette, Jour. Econ. Ent., vol. 8, p. 375, 1915 (synonomy). 



Record. Polygonum sp.; San Jose (Davidson). 



12 R. corylinum Dvdn. is omitted from this key as the apterous female was 

 never described and specimens are not available to the author. 



