36 



of injury by this spotted bean l>eetle was observed near Fort Collins, 

 where a large patch of beans had nearly ever}^ leaf killed by the 

 larvse of this insect. At that time, in July, the beetles were in the 

 pupal state, hanging- in great numbers on the underside of the leaves. 

 Professor Gillette stated that no effective remedy for them was 

 known, the insect being able to withstand anything that did not 

 injure the plants. The adult beetles arc said to exude a tiny drop of 

 yellow liquid of a pungent odor from each knee joint when disturbed. 

 The insect is discussed by Professor Gillette in Bulletin ID of the 

 Colorado Experiment Station. 



-- The appJe fiea-hvfle {TI(dtjcaJmim)^uuitaY^^ — July 19 a collecting 

 trip was made up Platte Canyon. At Pine Grove, some miles up the 

 canyon, the alders along the river were found to be infested by beetle 

 larvae which ate the upper side of the leaves, in some cases completely 

 skeletonizing them. An attempt was made to rear the adult beetle, 

 but other duties interfered and it was not successful. A numl)er of 

 the larva? were collected, however, and Mr. Schwarz identities them as 

 those of IlaHlca hiinarginata. 



The tent catetpUlar {Clhiocampa fviUjllh Stretch). — On July 20 the 

 ascent of Pike's Peak was made, and here occurred the worst case of 

 forest depredation liy insect foes that ever came under my observation. 

 The aspens were completely defoliated b}^ the larva? of (JUsiocatiqxt 

 fragills. The imagos were then issuing, and, even in the middle of 

 the day, they swarmed aljout the tops of the leafless trees like l>ees, 

 thousands and thousands of them. The cocoons literally covered the 

 twigs, one a foot in length often containing a dozen or more of them. 

 So completely defoliated were the trees at this place that Mr. Dyar 

 failed to iind a single leaf with which to supply an aspen-feeding Not- 

 odont larva which he was rearing. Our observations were made 

 mostly at 1),()00 to 12,000 feet altitude. The willow and rose were also 

 attacked, ])ut not nearly so severely as the aspen. Over what area this 

 injury extended I can not say, being unalde to make sufficient observa- 

 tions. In the vicinity of Cripple Creek the aspens were also infested, 

 but not nearh' so badly as those on Pikes Peak. On reaching the sum- 

 mit of the peak we found hundreds of the moths lying dead or helpless 

 on the snow banks. They had evidentl}^ flown up from the timber 

 line, and, becoming benumbed, fallen in the snow, there to die. 



The lilachorer {Podosesia syringe Harr.). — In West Denver numbers 

 of ash trees were completely killed by this Sesiid borer. The trees 

 were small, about 6 inches in diameter, and dozens of empty pupal 

 shells were protruding through the bark. 



The fruit-tree leaf -roller {Cacoecia argy?'ospila Walk.). — The leaves 

 of living ash trees were badl}^ infested with the larvte of this Tortricid^ 



A neid tent Gaierpillar {Clisiocampa tigris D3"ar). — The scrub oak in 

 the eastern foothills, especialh" just west of Sedalia, between Denvei' 

 and Colorado Springs, was badly infested with the larvse of this new 



