180 REPORT ON NATIONAL MUSEUM. 



EiLET, Charles Y. Pyrethrum : Its use as an insecticide (pp. 7G-87 

 [16-27], pi. 3, 4). 



Contains a reprint of the "Circnlar in reference to pyrethnim," issued by 

 the U. S. Commissioner of Agriculture [G. B. Loring] in 1882, giving a history 

 of the discovery and application of pyrethrnm as an insecticide and directions 

 for the preparation and application of this substance ; reports from corre- 

 spondents and from the author of their experience in the growth of the plants. 



Chinch-bug notes (pp. 87-89 [27-29]). 



Gives a verification of Cyrus Thomas's predictions in relation to the ravages 

 of Blissus levcopierus in 1881 and 1882 ; extracts from correspondence reporting 

 the abundance of this insect early in 1882 ; letter from J. G. Barlow on the 

 weather and the ravages of the Blissus in Washington County, Missouri, in 

 1882 ; irrigation, cremation, and other means against these insects. 



The Army-worm, Leucania vnipuncta Havr. (pp. 89-103 [29-46], 



pi. 2; pi. 6, figs. 1-3). 



Gives a history of investigations into the natural history of Leucania uni- 

 puvcta ; states place and manner of oviposition of this moth ; its prolificacy ; 

 the diiration of the egg and larva stages ; describes habits and characteristics 

 of this larva and of larvai of Leucania generally ; gives means of predicting and 

 preventing their ravages, and extracts from letters received in 1882; in- 

 cludes also the following subchapters : Howard, L. O. Report of observa- 

 tions upon the army-worm, 1881. Lockwood, S. Account of the invasion 

 of 1880 in New Jersey. 



Insects affecting the rice plant (pp. 127-138 [67-78], pi. 6, figs. 



4-5; pi. 7, figs. 1, 4-5). 



This contains a statement of the amount of rice produced in the United 

 States in 1879, and of the investigation made by L. O. Howard, in 1881, into 

 the injuries done to the rice crop by insects ; with subchapters entitled : The 

 rice grub (Chalepus trachi/pi/gvs liurm.). — The water-weevil (Lissorhoptrus sim 

 plex Say). — The rice-stalk borer (Chilo aryzaeellus n. sp.). — White blast. — 

 Other insects injurious to growing rice. 



The rice grub, Chalepus trachyjnjgus Burm. (pp. 128-129 [68-69], 



pi. 6, fig. 5). 



Gives report of L. O. Howard on the habits and ravages of and means agaicst 

 Chalepus trachypygus , with references to earlier observations ; describes struct- 

 ural characters and geographical distribution of the genera Cyclocephale and 

 Chalepus, and gives description and figure of larva and imago of Ch. trachy- 

 pygus. 



The water weevil, Lissorhoptrus simplex Say (pp. 130-133 [70- 



73], pi. 6, fig. 4). 



Gives seasons, habits, ravages, classification, and synonymy oi Lissorhoptrus 

 simplex, with description and figures of larva and imago ; includes extract from 

 J. Screvens in author's "The ' water- weevil' of the rice plant" (Amer. Nat., 

 June, 1881, v, 15), p. 483, and extract from a report by L. O. Howard ; Spala- 

 copsis suffusa and Hippopsis Icmniscata boring in stems of Chenopodium anthel- 

 miniyyiim. 



— The rice-stalk borer, Chilo oryzaeellus n. sp. (pp. 133-135 [73- 



75], p. 3 [167], pi. 7, tig. 1). 



