303 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 2 



fall months. A large percentage of the individuals are pinkish. 

 This insect was scarce in the spring. 



C. quercus (?) Kalt; Quercus. 



On both the white oak {Q. lohata) and the blue oak (Q. kelloggii) 

 I took a species of Callipterus having six tubercles on the dorsum. 

 The species is green and is very similar to the C. quercus as de- 

 scribed in Buckton's Monograph of British Aphides. This in- 

 sect infests the under sides of the leaves in large companies. It 

 was very common in April and May, though scarce in the fall. 



C. tilice Linn. ; . Tilia.. 



This European species was found sparingly on the leaves of linden 

 trees. 



Aphis hrassiccE Linn. ; Mustard. 



Very common on the mustard (Brassica campestris) , where it was 

 abundantly parasitized by an Aphidius. 



A. rumicis Linn. ; 



Common on ivy shoots in March; also taken on the vetch (Vicia) 

 and Senecio mikanioides. 



A. ceanothi Clarke; CeanotJius cuneatiis. 



This brown species was found in immense colonies on the tips of the 

 shoots of the mountain lilac (C. cuneatus). 



A. medicaginis Koch; Medicago denticvlata. 



Found on the bur-clover in April. A Braconid {Lysiphlehus sp.) 

 was reared from parasitized specimens. 



A. pomi ( ?) De Geer; Pear. 



A dark green species agreeing with A. pomi, with the exception 

 that Cauda was black and the body dark olive green. Taken in 

 large colonies on pear in May. 



Aphis sp. ; Senecio mikanioides. 



Alate Female 



Length of body 1.30 mm. ; expanse of wings 5.2 mm. ; antennte joints III 

 .3 mm., IV .22 mm., V .12 mm., VI .08 mm., VII .14 mm. ; general color dark 

 green ; head and thoracic lobes black ; eyes dark red ; antennae two thirds 

 length of body, dark green ; joints 3 and 4 strongly tuberculate, joints 3, 4 

 and 5 with small sensoria ; abdomen green, paler below ; on the dorsum, 

 posterior to the cornicles, there are two cross-bands of dark green ; cornicles 

 short, barely exceeding the tarsi, slightly tapering to their apices, almost 

 black ; cauda short, green, pilose, globular ; legs yellowish green, the joints 

 darker, the tarsi green ; veins and stigma brownish grey ; insertions pale ; 

 veins thin, the discoidals obsolete at their bases ; beak pale, reaching the ab- 

 domen. 



