115 



I tried the experiment of applying pyrethrum for the destruction of 

 the insect. A large branch was dusted with a mixture of one part 

 of pyrethrum to ten of flour, at 9:30 a. m., July 4, and soon after 

 the lice began falling from the twigs. At 6 p. m. only a few re- 

 mained, and by 8 a. m. of the second day thereafter all had fallen 

 off and were lying dead upon the table. Spraying the foliage of 

 these trees with water in which pyrethrum was suspended in the 

 proportion of about a tablespoonful to a gallon of water would, con- 

 sequently, in all probability, destroy the lice, or at least so effectu- 

 ally check their multiplication as to prevent injury to the trees. 



3. An Elm Bakk Louse. 

 (Lecaninm, sp.) 



Order Hemiptera. Family Coccid^. 



On the twigs of the white elm, at Normal, we found, this last season, 

 a large brown bark louse very similar in size, shape and general 

 appearance to the maple Pulvinaria previous to the appearance of 

 the cottony egg mass beneath the body of the female, but differing 

 especially in the fact that the eggs were not enclosed in the waxy 

 filamentous masses or nests characteristic of Pulvinaria. 



As we obtained only the adult female, we had not the material 

 for determining or describing the species. The matured scales are 

 nearly circular, 5 mm. in diameter, vaulted, emarginate before and 

 behind, the upper surface more or less shining, dark brown, irregu- 

 larly pitted on the central area, (where, however, it is nearly smooth), 

 and deeply and irregularly punctured on the sides,— below the punc- 

 tures irregularly rugose. The eggs are oval, ,099 mm. in length by 

 .048 mm. in transverse diameter. Beneath females obtained July 

 2, were eggs in various stages of development, young which had just 

 hatched, and those which had just passed the first moult. 



4. The Three-Banded Leaf Hopper. 

 {Typhlocyha tricincta, Fitch.) 



Order Hemiptera. Family Coccidje. 



About the middle of June, this pale yellow leaf hopper, distin- 

 guished by two transverse dusky bands, (one across the middle 

 and one at the tips of the wing covers), and a dusky cloud upon 

 the scutellum, was abundant enough upon the leaves of the 

 white elm, at Normal, to do considerable damage. This species, de- 

 scribed by Fitch in his Third Eeport as State Entomologist of New 

 York, (p. 74), was originally found by him, in abundance, on rasp- 

 berry and currant bushes, and on grape vines. 



