HEMIPTERA OF COLORADO. 
115 
Aphalara occideiitalis liiley Ms. Uet. Kiley. 
Ouray, June 22d (Gillette). 
Aphalara solidaginis Riley Ms. Det. Riley. 
Fort Collins, July 4th (Gillette). 
Aphalara iitahensis Riley Ms. Uet. Riley. 
Steamboat Springs, July 12tli on Artemisia tridentata 
(Baker). Green Mountain Falls, Colorado Springs, July 
(Tucker). 
Trioza ainelanchieris Riley Ms. 
Horsetooth Gulch, May 21st (Baker). 
Det. Riley. 
1,1 via vernalis Fitch. 
Det. Riley. 
Trinidad, May 14th; Fort Collins, June 4th (Gillette). 
Chernies sp.^ 
“Winged female: Body very dark brown, about 1 mm. long. Alar extent about 3.75 
mm. Antennae about 0.20 mm. long, the third, fourth and fifth joints with about nine 
annulations each. Wings rather long and narrow. Fore wing with subcostal vein wavy, 
first and second discoidals s.ender, stigmatal obsolete at base, stigma sharp pointed and 
oblique at base. Hind wings with the discoidal obsolete. Legs short,” 
Fort Collins, June 19fcli, winged and wooly apterous 
individuals on Psendotsuga douglassi (Cowen). 
Pemphigus fraxinifolii Riley. 
Fort Collins, July 17th in typical pseudo-galls on Fraxinus 
americana. Mostly wingless (Cowen). 
Pemjihigus popiilicaiilis Fitch. 
Fort Collins, July 12tli, in typical galls on Populus 
monilifera. In several cases Chaitophorus populicola was 
found associated with this species in the partly open galls 
(Cowen). 
Pemphigus popiili-eonduplifolitis Cowen n. sp. 
“Winged viviparous female: Length 1.8-2.3 mm. Alar "expanse 6.85 mm. Nearly 
black, pruinose. The abdomen is deep green when the glaucous matter is removed by 
placing the insect in alcohol. Antennae I mm. long, joints slender, fifth and sixth with 
about six or seven annulations each. Stigma short and broad. Unguis usually with a 
constricted neck. Similar to ramulorum but larger and the antennal joints not nearly so 
strongly annulated. 
Apterous individuals yellowish, with a thick mat of wooly secretion enveloping the 
abdomen. Eyes black.” 
*In the Aphididae all the determinations were made by Mr. Cowen, who also wrote 
all the decriptions and collated the records. The undetermined and undescribed species 
mentioned in the Custer County List (see Cockerell. 10) are not referred to except in cases 
where there is a probability of their being identical with species mentioned in this list. 
