6P WASHINGTON. 265 



Galeruca notata Fab., occurs in all stages on bone-set or 

 thoroughwort, Eiipatorium perfoliatum, during the latter part 

 of August and the first part of September, when the plant is in 

 bloom. When the larvae are full-fed they ascend to the flower 

 heads and drawing the flowers together by means of webs, 

 form between them a cocoon of loose net-work in which the 

 pupal stage is passed. The species was quite common at Cold 

 Spring Harbor, !,.!., during the season of 1890. 



Disonycha pennsylvanica 111., occurs in abundance in the 

 neighborhood of New York in May on different varieties of the 

 common aquatic arrow-head, Sagittaria variabilis. Several 

 color variations occur together. 



Disonycha triangularis Say. Of this species Miss Murtfeldt 

 has already placed on record Chenopodium as the probable nat 

 ural food plant. It is also recorded as injurious to beets and 

 spinach. It has been found, in my experience, most numerous 

 on Chenopodium album and in less numbers on Amarantus 

 spinosus. My records of its occurrence in New York state 

 range from the beginning of April to the end of October. 



Haltica marevagans Horn is the common flea-beetle of the 

 evening primrose (CEnothera biennis). Of the distribution of 

 this species, Dr. Horn states that it occurs along the coast 

 region from Florida to New Jersey, and probably farther north. 

 He also says that in most of the collections examined by him 

 it was labelled foliacea. The beetle occurs in the greatest 

 abundance along the New Jersey coast and on the shores of Long 

 Island in the neighborhood of New York City. On the north 

 vshore of Long Island at Cold Spring Harbor it also occurs, and 

 I would not be surprised to know if its geographical range 

 might be further extended to the southern shores of Long 

 Island Sound in Connecticut, and perhaps even to Rhode 

 Island and Massachusetts. Although the insect, together with 

 its food plant, has been well known for years it was not de 

 scribed until 1889. I have noticed the beetle near New York 

 from the first week of July until September, though no doubt 

 it occurs there earlier and later, and in every place along the 

 seashore where its foocl plant is to be found. On the coast of 

 New Jersey, from Sea Girt to Long Branch, the evening prim 

 rose swarms with their numbers. They devour the leaves, all 

 but annihilating them, and even nibble large holes in the seed 

 pods. Like so many others of the Halticini they eat vora 

 ciously, and unless in the heat of the day are not particularly 

 active, seldom flying, and jumping only from two to four 

 inches. When rudely disturbed .or shaken from their food 

 plant they fall to the sand and there remain for some time, 

 whether on their backs or otherwise ; when in the former posi 

 tion they simulate death. As an instance of their abundance 



