HEMIPTERA OF COLORADO 117 



coxae. Antennae smooth. No fully duveluped iiiclividuals were ohi.iiriLMi. so that tlie 

 determation is somewhat <|uestionable.'" 



Hotclikis.s, Delta County, August liltli. in wonly patches 

 on young shoots of Quercus unduhita (Cowen). 



I^achnits pini L. 



"Lenjjth 3.1-5 mm., widtli 1.80 rnm. Legs and antennae slightly i)ubcsfetit with short 

 flue liairs. Body scarcely at all pubescent. Uostruin e.vtendliiir beyond middle of 

 abdomen. Lengths of anteunal joints: lU, O.fiO mm.; 1 V, U.riO mm.; V, i.25mm.; VI, 0.15 

 mm." 



Estes Park, July 15th on twigs of Pinus pondero-a var. 

 scopuhn'uni (Cxillette). These specimens differ from the 

 description given by C. M. Weed (Art. V. Aphididae, p 118) 

 in the characters given above (Cowen). 



Meliinoxanthiis hicolor Oestl. 



Fort Collins, September 80th on Salix (Baker). 



Melanoxaiithus salicis L. 



Fort Collins, October 8th on Populus balsamifera var. 

 canclicans (Baker). 

 Chaitophoriis negiindinis Thos. 



Fort Collins, common on Negundo aceroides throughout . 

 the season (Cowen). . . 



Chaitophoriis nigrae Uestl. 



Fort Collins, June 21st on Salix lougifolia (Cowen). 



Chaitophoriis popnlicola Thos. 



Fort Collins, July 5th, on Populus monilifera ((lillette). 

 Fort Collins, June 24th, on young shoots on Populus 

 angustifolia (Cowen). 

 Drepanosiphuin acerifolii Thorn. 



Fort Collins, July 2d on under side of leaves of Acer 

 dasycarpum. Flies ([uickly when disturl)0(l in tlie warmer 

 part of the day (Cowen) . 

 Aphis albipes Oestl. 



Fort Collins, July 12th, on underside of cui-led leaves of 

 Symphoricarpos occidentalis (Cowen). 

 Aphis armoraciae Cowen n. sp. 



••Ai)teious vivipiirous female: Length of body l.!K) mm. Len,;;th of .■mteiinae about 

 1.1'j mm. Antennae, head, extremity of bealv, femora, tarsi, and hi)riey tubes, deep dusky 



