Pomona College Journal of rLntomology 



Volume III 



M A ^' I'M 



Number 2 



HOST INDEX TO CALIFORNIA PLANT LICE 



(Aphid idle) 



E. O. ESSIO 

 HORTICn.TrRAI- COMMISSIONER OE VENTfRA CorNTV, CALI l-OHXI \ 



The following indrx lias bocn largely compilod from the works of W. T. 

 Clarke. W. M. Oaviason. H. 1". 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. .Vgrel. F.xp. Station). Prof. Tlieo. 

 Pcrgande (Oiv. of Entomology. U. S. Hept. of Agriculture), Prof. C. F. Baker 

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

 .Station), Mr. W. M. D.ividson. Mr. Morrison (Stanford University ), and Mr. ,!. T. 

 Momll. 



The index has been completi-ly remodeled according to their notes. 



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

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



.thies roncolor Parry (White Fir). 

 I.achnus abietis Fitch-Davidson. .Ir. 

 Ec. Ent. II. '2!)!). 19('9. 

 Abies graiidis Lindl. 



I.achnus occidentalis Davidson. .Ir. 

 Ec. Ent. II, .-^OO, 1909. 

 Acer up. (Maple). 



Drepanosiphum platanoides Schrk.- 

 Wilson, .Ir. Ec. Ent. II, .S.'.O, 1909. 

 .leer (Inxiirarpiim Ehrh. (White or ."sil- 

 ver Maple). 

 Dre|)ana|)his acerifolii (Thos.) Del. 

 Guer.-Davidson, Jr. Ec. Ent. Ill, 

 .sso. 1910. 



Acer neiuxdo see Xegundo acrroides 



Morncli. 

 Acer sacrhariiiuin Wag. (Soft, Rock or 



Sugar Maple). 



Dre])anaphis acerifolii (Thos.) Del. 

 (;uer.-Da\ idson, ,Ir. Ec. Ent. II, 

 ,so.s, 1909. 

 .Vlder see Alniis. 

 AInus rliomhifolia Nutt. (Alder), 



Callipterus alnifoliip (Fitch MSS.)- 

 Davidson, Jr. Ec. Ent. Ill, 37.'>, 

 1910. 

 Amnranthux ri-tro/ir.ru.'i I.. (Pigweed). 

 Tritida|)his radicicola ( Essig) Del, 

 Guer.-Essig, P. C. Jr. Ent. I. 10, 

 1.909. 

 Amhrosia pfilnstarhifa DC. (Ragweed). 

 Macrosiphum rudbeckiH- (Fitch) 

 .Sanb.-Essig. P. C. Jr. Ent. Ill, 

 +02, 1911. 

 .Imtinckia ipeciahilis F. & M. 



Mvzus persicBf Sulz. -Davidson, Jr. 

 Ec. Ent. Ill, .S78, 1910, 



