88 APHID NOTES 



II. THE APHIDIDAE INFESTING SAGE BRUSH 

 (ARTEMESIA SPP.) IN OREGON 



Nine species of aphids have heretofore been described as new 

 from the various species of Artemesia in America. Of these at 

 least seven are found in Oregon. Six additional species are here 

 recorded and it is possible that two of these, Microsiphum ore- 

 gonensis and Aphis hermistonii, may prove to be Western forms 

 of M. canadensis Williams and Aphis canae Williams. A key 

 to the Oregon species is included below: 



I. Nectaries less than four times as long as wide. II. 



Nectaries more than four times as long as wide. V. 



II. Body with speciaHzed setae. III. 



Body without specialized setae. IV. 



III. SpeciaHzed setae broadly fan-like at tip. Nectaries shorter than 



width. 



Chaitophorus tridentatae new species 

 Specialized setae narrowly fan-hke at tip. Nectaries twice as long 

 as broad. 



Microsiphum oregonensis new species 



IV. Setae pointed at tip. Nectaries as broad as long. 



Color green. Microsiphum canadensis (Williams) 



Color red or brown. Microsiphum artemesiae (Gillette) 

 V. Antennae shorter than the body. VI. 



Antennae longer than the body. IX. 



VI. Body with specialized setae (fan-hke at tip). VII. 



Body without speciahzed setae (pointed at the tip) . VIII . 



VII. Nectaries cylindrical and straight, mouth enlarged. 



Aphis frigidae Oestlund 

 Nectaries curved and slightly clavate, held close to the body. 



Aphis tridentatae new species 

 VIII. Color of body dark green. 



Aphis hermistonii new species 

 Color of body shining wine red. 



Aphis artemesicola Wilhams 

 Color of body brown. 



Third antennal segment with numerous small sensoria. 



Aphis reticulata new species 

 Third antennal segment with less than ten large sensoria. 



Aphis oregonensis new species 



