HEMIPTERA OF COLORADO 
117 
coxae. Antennae smooth. No fully developed individuals were obtained, so that the 
determation is somewhat questionable.” ' 
Hotchkiss, Delta Count}', August 19th, in wooly patches 
on young shoots of Quercus undulata (Cowen). 
Itachnns piiii L. 
‘‘Length .?.15 mm., width 1.80 mm. Legs and antennae slightly pubescent with short 
hue hairs. Body scarcely at all pubescent. Rostrum extending beyond middle of 
abdomen. Lengths of antennal joints: III, 0.60 mm.; IV, 0.30 mm.; V, 0.35 mm.; VI, 0.15 
mm.” 
Estes Park, July 15th on twigs of Pinus ponderosa var. 
scopulorum (Gillette). These specimens differ from- the 
description given by C. M. Weed (Art. V. Aphididaa, p 118) 
in the characters given above (Cowen). 
Melanoxanthus bicolor Oestl. 
Fort Collins, September 30th on Salix (Baker), 
Melanoxanthus salicis L. 
Fort Collins, October 8th on Populus balsamifera var. 
candicans (Baker). 
Chaitophoriis negiindinis Thos. 
Fort Collins, common on Negundo aceroides throughout 
the season (Cowen). 
Chaitophoriis nigrae Oestl. 
Fort Collins, June 21st on Salix longifolia (Cowen). 
Chaitophoraspopnlicola Thos. 
Fort Collins, July 5th, on Populus monilifera (Gillette). 
Fort Collins, June 24th; on young shoots on Populus 
angustifolia (Cowen). 
Drepanosiphum acerifolii Thom. 
Fort Collins, July 2d on under side of leaves of Acer 
dasycarpum. Flies quickly when disturbed in the warmer 
part of the day (Cowen). 
Aphis albipes Oestl. 
Fort Collins, July 12th, on underside of curled leaves of 
Symphoricarpos occidentalis (Cowen). 
Aphis armoraciae Cowen n. sp. 
“Apterous viv'iparous female: Length of body 1.90 mm. Length of antennae about 
1.10 mm. Antennae, head, extremity of beak, femora, tarsi, and honey tubes, deep dusky 
