10 PREFACE. 



difficulty in many sections, and in very recent years a complete failure 

 in the District of Columbia and in many parts of Maryland, and the 

 addition of a new pest from abroad is most unwelcome. 



The study of Halticus ulileri is an outgrowth of investigations on 

 insects affecting beans and peas. This species, though scarcely more 

 than a second-rate pest, is deserving of further study as regards its 

 life habits and the methods to be used in its control. 



Some observations were made bearing upon the early life history of 

 the imbricated snout-beetle, JEpicwrus imbricatus, but attempts to rear 

 the larvae were not successful. The observations which are here 

 recorded, however, are of considerable interest, especially as regards 

 the egg-laying of this species. 



Rather remarkable success was attained in the study of the fruit- 

 chafer, Euphoria inda, which was carried successfully through all its 

 stages. The results demonstrate for all practical purposes that this 

 species is not injurious except in the adult conditiou; a faut that has 

 previously been surmised, but which had not been brought out with 

 sufficient clearness in earlier investigations. 



Nothing of a biologic nature has hitherto been published concerning 

 one of our two commonest May beetles, Lachnosterna arcuata, which 

 is here described and illustrated in its immature stages for the first 

 time. Its life history is also given somewhat in detail, as well as notes 

 bearing on its life habits and economy. 



The unusual abundance of Disonyeha .xanthomelcma, the spinach flea- 

 beetle, the past year led to a special study of this species, resulting 

 in the discovery of a new food plant and the completion of its life 

 history. 



The article on the flea- beetles which attack tobacco, the potato and 

 other solanaceous v plants is a continuation of observations begun in 1897 

 and published in Bulletin No. 10. 



The cherry leaf-beetle, Galerucella cavicollis, is one of the species 

 which has been prominent as a pest during the last year, and has 

 received in consequence some study. Until the past season it has not 

 been injurious to the peach. 



The article on the plum and rose leaf-beetles is in continuation of 

 studies begun in previous years ; which is true of the notes which are 

 here presented on the fruit-tree bark-beetle and other fruit-tree borers. 



It should be added, for the benefit of the bibliographer, that the title 

 of this bulletin is simply assumed for convenience, and that, although 

 each separate account is not signed by the author, each should prop- 

 erly be indexed separately, as each article is in itself complete, having 

 no special bearing on either what precedes or follows it in the order of 

 publication. 



The illustrations were for the most part prepared from selected 

 fresh material and, with a single exception, especially drawn or other- 

 wise adapted for this work. 



F. H. C. 



