248 THE CANADIAN ENTOMOLOGIST. 



F. Honey tubes long. 



G. Antennas on frontal tubercles . . ..... Rhopalosiphum. 



GG. Antennce not on frontal tubercles. 



H. Honey tubes clavate Siphocoryne. 



HH. Honey tubes cylindrical. 



I. Body long . . Hyalopterus. 



1 1. Body short Aphis. 



FF. Honey tubes short. 



J. Antennae shorter than body . . . . Chaitophorus. 

 JJ. Antennae longer than body. 

 K. Honey tubes longer than 



broad Drephanosiphum. 



KK. Honey tubes shorter than 



broad Callipterus. 



Phyiloxera. — Vasiatrix, Planchon ; Vitig vinifera ; California. 

 Pemphigus. — Stigma more than twice as long as hro^.d, pop iilicau/ is ; 

 less than twice as long as broad, betie. 



Poptilicaidis, Fitch ; cottonwood and poplar ; Fresno, Berkeley, 

 Rumsey. 



Betie, Doane \ sugar-beet, Canaigre (Rumex hymenosepalous) ; red 

 dock ; Berkeley, Placer County, Palo Alto. 



While these two forms of Pemphigus are reported as separate species, 

 it is the opinion of the writer that it will be found that one is a migrant 

 form of the other. I have noted betce to be extremely prevalent on sugar. 

 beets planted near cottonwoods infested w'wh popu/icaulis. 



ScHizONEURA — Abdomen chocolate-brown, lanigera ; pale green, 

 pinicola ; black, querci ; lilac brown, Americafia. 



The colour effect is best obtained by bathing the fresh specimens for 

 a short time in 95% alcohol. 



La7tigera, Haus. ; apple j throughout the State. 

 Pinicola, Thos. ; Pine (P. radiata) ; Berkeley, Palo Alto. 

 Querci, Fitch ; various oaks ; Berkeley. 

 Americana, Riley ; elm ; Berkeley, Newcastle. 



Lachnus.^ — Alnifoliie, Fitch ; alder {A/nus, sp.) ; Berkeley, Colfax. 

 Chaitophorus. — Viminalis, Monell ; willow; Newcastle, Watson- 

 ville. 



Callipterus — 



A. Body with dorsal setae. 

 B. Body less than twice as long as broad. 



