A SYNOPSIS OF THE APHIDIDAE 17 



4. Cornicles one-fourth the length of the body or more, swollen in the middle 



(fig. 24) Drepanosiphum Koch 



Cornicles large and nearly one-fourth the length of the body, swollen at the 



base and tapering toward the middle (fig. 23) ....Drepanaphis Del Guercio 



5. Inner side of antennal tubercles about one-half the length of the inner side 



of the first antennal joint (fig. 29) Euceraphis Walker 



Inner side of antennal tubercles more than one-half the length of the inner 



side of the first antennal segment (figs. 27-28) Calaphis Walsh 



6. Antennae longer than body, except in Callipterinella, with VI spur not much 



shorter than VI base (fig. 31) 7 



Antennae shorter than the body, with VI spur very short, often being little 



more than a nail-like process (fig. 34) 9 



7. VI spur considerably longer than VI base, being one and one-half to two 



times as long. Anal plate emarginate but not deeply bilobed. 



Callipterinella Van der Goot 



VI spur about equal to or shorter than VI base. Anal plate deeply bilobed 8 



8. VI spur and VI base subequal (fig. 31). Cornicles twice as long as broad 



in the middle and constricted in the middle (figs. 26, 32). 



Myzocallis Passerini 



VI spur shorter than VI base (fig. 30). Cornicles much broadened at base 



(fig. 33) Eucallipterus Schouteden 



9. VI spur less than one-half the length of VI base (fig. 34). Cornicles not 



longer than broad at the base, and constricted in the middle (fig. 35). 



Chromaphis Walker 



VI spur at least one-half as long at VI base (figs. 63, 66). Cornicles short, 



about as long as broad and placed on a broad base Callipterus Koch 



2. Genus Drepanosiphum Koch 



Koch, Die Pflanzenlause, p. 201, 1855. Type Aphis palantanoides Schrank. 



4. Drepanosiphum platanoides (Schrank) 



Figures 21, 24, 36 



Schrank, Fauna Boic., vol. 2, p. 1206, 1801. Aphis (orig. desc.). 

 Wilson, Jour. Econ. Ent., vol. 2, p. 349, 1909 (desc. ala. vivi., ala. ovi. 



females). 



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

 Essig, Pom. Jour. Ent., vol. 4, p. 759, 1912 (list). 



Records. Acer macrophyllum, A. negundo; Berkeley, 1915 (Essig) ; Stan- 

 ford University, October, 1914, April, 1915; A. pseudoplatanus, Stanford Univer- 

 sity, November, 1914 (Morrison); A. saccharum, Berkeley, June, 1915; Platamis 

 racemosus, Stanford University (Davidson) ; Acer sp., San Lorenzo, 1908 (Wil- 

 son). 



This is a very common species in the San Francisco Bay region 

 on various species of maples, and on box elder and western sycamore. 

 In April the alate and apterous viviparous females are abundant, 

 remaining so throughout the summer and early fall. In the later 

 fall (October and November) the sexes appear. Just where the eggs 



