HEMIPTERA OF COLORADO. 115 



Aphalara occidentalis Riley Ms. Det. Riley. 



Ouray, June 22d (Gillette) . 



Aphalara soliclaginis Riley Ms. Det. Riley. 



Fort Collins, July 4th (Gillette). 



Aphalara utahensis Riley Ms. Det. Riley. 



Steamboat Springs, July 12th on Artemisia tridentata 

 (Baker). Green Mountain Falls, Colorado Springs, July 

 (Tucker) . 



Trioza amelanchieris Riley Ms. Det. Riley. 



Horsetooth Gulch, May 21st (Baker). 



Livia vernalis Fitch. Det. Riley. 



Trinidad, May 14th; Fort Collins, June 4th (Gillette). 



Chermes 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 slender, stigmatal obsolete at base, stigma sharp pointed and 

 obli(iub at base. Hind wings with the discoidal obsolete. Legs short." 



Fort Collins, June 19th, winged and wooly apterous 

 individuals on Pseudotsuga douglassi (Cowen). 



Pemphigus fraxinifolii Riley. 



Fort Collins, July 17th in typical pseudo-galls on Fraxinus 

 americana. Mostly wingless (Cowen). 

 Pemphigus popiilicaiilis Fitch. 



Fort Collins, July r2th, in typical galls on Populus 

 monilifera. In several cases Chaitophorus populicola was 

 found associated with this species in the partly open galls 

 (Cowen) . 



Pemphigus populi-conduiilifolius Cowen n. sp. 



"Winged viviparous female: Length 1.8-3.3 mm. Alar 'e.xpanse 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 ■ 'ounty List (see Cockerell, 10) are not referred to except ia cases 

 where there is a probability of their Ijeing identical with species mentioned la this list. 



