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PRELIMINARY LIST 
Psylla pursliiae Riley Ms. Det. Riley. 
Rist Canon, May 29th; Steamboat Springs, July 26th; 
Trinidad, May 14th (Gillette). 
Psylla 4 -lineata Fitch. Det. Riley. 
Soldier Canon, five miles west of Fort Collins, May 19th 
(Gillette). 
'Psylla rihis Riley Ms. Det. Riley. 
Spring Canon, May 11th and June 5th; Fort Collins, 
October 15th and May 9th; Trinidad, May 14th (Gillette). 
Dixon’s Canon, May 6th on Ribes cereum (Baker). 
Pachypsylla celtidis-iimhilicus Riley. Det. Riley. 
Golden, April 30th (Gillette). 
Pnphylliira arctostapliyli Riley Ms. Det. Riley. 
Spring Canon, July 24th, imagos and nymphs on Arctos- 
taphylos uva-ursi (Cowen). 
Aplialara angiistipeiinis Riley Ms. Det. Riley. 
North Park, July 20th; Steamboat Springs July 26th; 
Montrose, June 24th; Fort Collins, July 4th; Dolores, June 
18th; Estes Park, July 11th; Colorado Springs, August 2d 
(Gillette). Fort Collins, June 12th, on alfalfa (Baker). 
Aplialara calthae L. Det. Riley. 
Fort Collins, May 8th; Rist Canon, May 29th (Gillette). 
Fort Collins, May 16th to 31st on alfalfa, and May 7th on 
gooseberry; Steamboat Springs, July 12th on Carex (Baker). 
Canon City, October 15th in all stages on tomato (John 
Gravestock). Green Mountain Falls, Colorado Springs, July 
(Tucker). 
Aphalara epilohii Riley Ms. Det. Riley. 
Ouray, June 22d (Gillette). 
Aplialara liarrisii Riley Ms. Det. Riley. 
Near West Clitf, Custer County (Cockerell, 10). 
North Park, July 19th; Fort Collins, June 14th; Estes 
Park, July 12th (Gillette). 
Aplialara marginata Riley Ms. 
Custer County, midalpine (Cockerell, 10). 
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