Pomona Colleoe Journal or Entomoi.oov 715 



Spur of artic'li- \^I iiiorr tlinii rive times as long as tlir base, and cor- 

 nicles longer than the base. ChaHnphorut 

 \. Spur of article VI more than f<iur times as long as the base, cauHn 



constricted at the base. 5 



Spur of article \'I not four times as long as tin- base, and thi- eauda not 



constricted at the base. Mirrrlla 



5. Sti|)C of Cauda «'ell developed and on a conicil base, anal plati- con- 

 stricted in the middle. Eichnrhailophorut 

 Stipe of Cauda obsolete or not well diveloped and on a (juadrangular 



base, anal plate well rounded. .Irclaphia 



(). .\iitennii' about half the length of the Ixidy ;ind the spur of article \'l 



considerably longer than the base. 7 



.\ntenna> nearly as long as the body and thi' >>pur of .irtiele \' I shorter 



or scarcely longer than the base. Si/itiilohiiiii 



". Cornicles absent, body with lateral tubercles. Fiillntrai/a 



Cornicles present, lateral body tubercles wanting. Thomnsia 



8. Antenna- shorter than the body, cornicles very short and tapering with 



flanged mouth. Sipha 



KEYS TO CALIFORNIA SPECIES 



CHAITOPHORUS Kodi. 

 Type Aphis aceris I-inn. 

 N'o California represiiitativc in this .St.ale to date. 



MICRELLA n. tren. 

 Tyiio M. monelli ii. sp. 

 One species described. 



.V. monrlli n. sp. On Sali.r Insinlrpis Hcntli. .■ind S. larvi/ratne Bebb., at 

 Oxnnrd and Snntn Paula, Cal. 



EICHOCHAITOPHORUS n. pen. 

 'ry|)c E. populifolii n, sp. 

 One spcci<'s as herein described. 

 K. populifolii n. s]). On Pojiulus trirhocnrpa T. & O., .Santa I'aula. Cal. 



ARCTAPHIS Walker 

 Type A. populi Linn. 

 No Californi.i species reported. 



SYMDOBIUS Mr.rdwilkn 

 Type A. oblongus Heyden 

 1. Body small, nearly black, abdomen of .apterous female with lateral 



body tubercles. macroilachifae 



Body large, never black, abdomen of apterous female without lateral 



tubercles. salicicnrlicit 



S. macrostachi/ae n. sp. On Salix macrostachya Nutt., Santa Paula, Cal. 

 .S. salicicorlicis n. sp. On base and roots of Salix laevigata Bebb., near Santa 

 Paula, Cal. 



