Pomona (college Journal of rLntomology 



Volume III MAY 1911 Number 2 



HOST INDEX TO CALIFORNIA PLANT LICE 



(Aphididse) 



E. O. ESSIG 

 HORTICULTURAL COMMISSIONER OF VENTURA COUNTY, CALIFORNIA 



The following index has been largely compiled from the works of W. T. 

 Clarke, W. M. Davidson, H. F. Wilson, A. P. Hayne, Carroll Fowler and G. Del 

 Guercio. For three years the writer has been collecting and studying this group 

 of insects and has yet a large number of undetermined species to add. A rough 

 preliminary list was sent to Prof. O. W. Oestlund (of the University of Minne- 

 sota), Edith M. Patch (University of Maine, Agrcl. Exp. Station), Prof. Theo. 

 Pergande (Div. of Entomology, U. S. Dept. of Agriculture), Prof. C. F. Baker 

 (Pomona College), and Prof. H. F. Wilson (Univ. of Oregon, Agrcl. Exp. 

 Station), Mr. W. M. Davidson, Mr. Morrison (Stanford University), and Mr. J. T. 

 Monell. 



The index has been completely remodeled according to their notes. 



I heartily invite all entomologists to assist me in the development of this index 

 and in perfecting the list of synonyms of this very important group. 



Abies concolor Parry (White Fir). Drepanaphis acerifolii (Thos.) Del. 



Lachnus abietis Fitch-Davidson, Jr. Guer. -Davidson, Jr. Ec. Ent. II, 



Ec. Ent. II, 299, 1909. 303, 1909- 



Abies grandis Lindl. Alder .sec Alnus. 



Lachnus occidentalis Davidson, Jr. Alnus rhombifoUa Nutt. (Alder). 



Ec. Ent. II, 300, 1909. Callipterus alnifoliae (Fitch MSS.)- 



Acer sp. (Maple). Davidson, Jr. Ec. Ent. Ill, 375, 



Drepanosiphum platanoides Schrk.- IJIO. 



Wilson, Jr. Ec. Ent. II, 350, 1909- '4'" «'■«»""'•« retroflexus L. (Pigweed). 



. , T-., , /TTTi .. r^.i Trindaphis radieicola (Essie) Del. 



Acer dasycarpum Ehrh. (White or Sil- Guer.-Essig, P. C. Jr. Ent. I, 10, 



ver Maple). 1909 



Drepanaphis acerifolii (Thos.) Del. , , ■ -i , i T\n /r> J^ 



^' U -1 T T-; T. . xr-T Ambrosia psilostachiia DC. (Ragweed). 



Guer.-Davidson, Jr. Ec. Ent. Ill, ,f ", " ,■, , . ^r^., A 



<?fin ifiin Macrosiphura rudbeckiae (ritch) 



•^^"' 'y'"- . Sanb.-Es,sig, P. C. Jr. Ent. Ill, 



Acer negundo see Negundo aceroides 402 I9II. 



Moench. AmsincMa spectahilis F. & M. 



Acer saccharinum Wag. (Soft, Rock or Myzus persicae Sulz.-Davidson, Jr. 



Sugar Maple). Ec. Ent. Ill, 378, 191O. 



